Open access peer-reviewed chapter

High Temperature Creep of Metal Oxides

By Krystyna Schneider and Mieczyslaw Rekas

Submitted: April 8th 2017Reviewed: September 7th 2017Published: December 20th 2017

DOI: 10.5772/intechopen.70876

Downloaded: 376


This chapter presents a comprehensive review of the creep technique used for the study of defect structure and diffusion in metal oxides, both single crystals and ceramics. At high temperatures, the creep rate is proportional to the diffusion coefficient of the slowest species in solid compounds, whatever deformation mechanisms are present (Nabarro viscous creep, recovery creep or pure climb creep). The creep rate dependence on deviation from stoichiometry can be determined from this diffusion. In the case of metal oxides, the departure from stoichiometry is controlled by the oxygen activity which usually is identified with oxygen partial pressure, pO2. The pO2 dependence of the creep rate provides direct information about the nature of minority point defects. On the other hand, studies of the temperature dependency of the creep rate inform us about the activation energy of the diffusion coefficient.This review focuses primarily on the creep behavior of transition metal oxides such as Ni1−yO, Co1−yO, Fe1−yO exhibiting disorder in metal sublattice, as well as ZrO2−x with majority defects in oxygen sublattice. The advantage of these studies is determination of both defect structure and diffusion coefficients of minority defects namely in oxygen sublattice in iron-triad oxides and in zirconium ZrO2 sublattice.


  • high temperature creep of metal oxides
  • defect structure
  • nonstoichiometry
  • diffusion

1. Introduction

This chapter presents a review of the creep technique used for the study of defect structure and diffusion in metal oxides. Transition metals of the iron-row triad (Fe, Co, Ni) monoxides were chosen. These oxides at higher temperatures exhibit electronic conductivity. Zirconia stabilized with yttria, termed as YSZ, was also the subject of interest. This material is treated as model system of ionic (super ionic) conductor. Taking into account that creep behavior of the oxides is generally dependent of the minority defects properties (types and concentrations) which are especially strictly related with majority point defect, a short description of the point defect structure of each analyzed oxide proceeds the appropriate chapter.

2. Definition of terms

Creep, or more generally high-temperature plastic deformation of metal oxides, is a suitable method for measuring diffusion coefficients and to assess the nature of point defects responsible for diffusion processes. Above a so called Tamman’s temperature and under constant applied stress, a steady state is reached where the rate of deformation remains constant. Tamman’s temperature of metal oxides assumes value of about 0.45 × Tmelt [K] [1] creep rates, ε̇, is commonly expressed by the equation [2]


where ε is the creep strain, A is constant dependent of the material structure and the creep mechanism, σ is the applied stress, m and b are exponents dependent on the creep mechanism, d is the grain diameter, k is Boltzmann’s constant, T is the absolute temperature and Q is an activation energy of the creep.

At high temperatures, the creep rate is proportional to some diffusion coefficient, whatever the exact nature of deformation mechanism: Nabarro-Hearing creep, grain boundary sliding and dislocation movements are valid [3]. This diffusion coefficient, D, is an effective diffusivity involving both the lattice and the grain boundaries diffusivities. In most cases, it reduces to the diffusivity of the slowest species. In case of transition metal oxides, the creep rate dependence on deviation from stoichiometry is carried out through diffusivity. In binary oxides, at high temperatures the deviation from stoichiometry and related majority point defects are controlled by the oxygen partial pressure, pO2. In most cases, these defects are only located either in metal or oxygen sublattice. Defects on other sublattice are present in a much lower concentration (named as ‘minority defects’), and the diffusivity of the corresponding species is very low. Their diffusion coefficient is proportional to the concentration of minority defects, which also varies as some characteristic power law with pO2, so that creep rate has related to this variable. Accordingly, the pO2 dependence of the creep rate leads to a direct approach to assess the nature of the minority point defects [2]


where C=ApO21n, Eact = Q is the energy activation of diffusion and n is the parameter dependent of the point defect structure.

3. Creep of transition metal monoxides

The transition metal monoxides such as iron-triad group (Fe, Co, Ni) show only metal deficiency: Fe1−yO, Co1−yO and Ni1−yO. The nonstoichiometry and related point defect structure discussed below for these oxides are based on both thermogravimetric equilibration and electrochemical measurements. The nonstoichiometry, y, is most pronounced with Fe1−yO (y = 0.043−0.167) [4, 5], whereas in Co1−yO [6] and Ni1−yO [7] y is about 0.000–0.012 and 0.0000–0.0010, respectively.

Nonstoichiometry y in M1−yO (M = Fe, Co, Ni) can be modified by changes of oxygen activity, pO2, in thermodynamic equilibrium with the oxide crystal (Kröger and Vink [8] notation of defects is used throughout this paper):


where i = 0, 1, 2 denotes the degree ionization. The nonstoichiometry of the M1−yO is then given by:


Applying the mass action law to reaction (3) and assuming that interaction among defects may be neglected, as well as supposing appropriate electroneutrality conditions, one arrives at the following relationship between nonstoichiometry and equilibrium oxygen pressure and temperature:


where 1/ny, or simply ny, is the parameter depending on the ionization degree of cation vacancies, assuming 2, 4 and 6 values for neutral, single- and double-ionized vacancies, respectively; Ey denotes the temperature coefficient directly related to the enthalpy of defect formation.

M1−yO (M = Fe, Co, Ni) are p-type semiconductors, which electrical conductivity is realized by electron (or electron hole) hopping mechanism between M3+ and M2+ ions. The concentration of quasi-free electron holes [h] is given by:


Accordingly, the following relationship between electrical conductivity, σ and equilibrium oxygen pressure and temperature is given by:




where e is the elementary charge, μ is mobility of the holes, σo and ho are constants involving mobility of electron holes and entropy terms of the equilibrium constant of the reaction (3), nσ is the parameter depending on the ionization degree of cation vacancies, assuming ∝, 4 and 6 values for neutral, single- and double-ionized vacancies, respectively; Eσ denotes the activation energy of the electrical conductivity.

Several minority defects can be proposed in M1−yO. Considering only simple defects oxygen vacancies VOj+(j = 1 or 2) or oxygen interstitials Oik(k = 1 or 2) the formation of these defects is described by the following:




Applying the mass action law to these equilibriums and taking into account the Eq. (7b), we can write the following relationships:




From Eqs. (2) and (10),




Similarly, from Eqs. (2) and (11),




So, using Eqs. (12) and (13) or Eqs. (14) and (15) carrying out the creep rates measurements as a function of oxygen partial pressure and temperature, we can determine both parameters n and Eact. Then, using the values of electrical properties such as electrical conductivity (or Seebeck coefficient) which are related to the concentration of the electron holes, we can identify the type of minority defect responsible for the creep diffusion process and can determine the activation energy of the diffusion.

3.1. Creep of NiO

Nickel oxide is a nonstoichiometric compound with a deficit of metal. Its chemical formula may be written as Ni1−y.O. The resulting majority point defects are nickel vacancies formula may be written as Ni1−y.O. The resulting majority point defects are nickel vacancies: VNi′, VNi″ and electron holes (Figure 1) [7]. The dependence of electrical conductivity, σ, as a function of oxygen partial pressure, pO2 and temperature is shown in Figure 2 [9, 10]. The reciprocal of oxygen exponent nσ = nh varies values between 4 and 6.

Figure 1.

Majority defect concentration in Ni1−yO. Defect concentrations ([ ]) are unitless values. They are expressed as Ni-site ratio.

Figure 2.

Electrical conductivity of at 1145 K Ni1−yO [9, 10].

The results of the creep studies of NiO single crystals [11, 12] and NiO polycrystals [3, 13, 14] are summarized in Table 1. The comparison of the activation energies for creep rate with oxygen self-diffusion obtained by Dubois et al. [15, 16] agrees only with a rather large uncertainty [1719]. Controversy, Figure 3 presents the diffusion coefficients determined by tracer of nickel [17, 18] and by the tracer self-diffusion of oxygen [19] on one hand, and the diffusion coefficient determined using the creep technique, on the other. The excellent agreement is observed between oxygen diffusion coefficient and the diffusion coefficient from the creep.

MaterialT/Tm**σ (MPa)pO2 (Pa)mEact (eV)nMinority defectMechanism of creepRef.
NiO s.crystal0.09–0.6620–1000.1–2 × 104NANANANANA[11]
NiO s.crystal0.6–0.815–1201–2 × 10412
5.4–8.5−0.06 to +0.11VO••Thermally activated glide recovery creep[12]
NiO polycrytals0.6–0.86–20
1–2 × 1041.5
3.80–0.03VO••Nabarro creep[13]
NiO polycrytals0.56–0.6134.5–79.82 × 1043.25 ± 0.182.46 ± 0.31NANADiffusion controlled climb glide[25]
CoO s.crystal0.49–0.666.9–312.1 × 104
1.1 × 10−4
CoO s.crystal0.61–0.758.3–14.5NA52.2NANADiffusion controlled dislocation motion[25]
CoO s.crystal0.61–0.802–2010−6
1 × 105
4.4–5.63.1–4.72VO•• \
Oix, Oi
Oxygen diffusion[26]
CoO s.crystal0.6
2 × 104
Oi »
Oxygen diffusion[27]
CoiO polycrytals0.58–0.6234.5–79.82 × 10433.12NANaDislocation motion[14]
FeO polycrystals0.73–0.952.5–1510−10–3 × 10−84.15 ± 0.102.8NAVO••Climbing dislocations[37]
FeO s.crystal0.67
3.2–5.33 × 10−13–2 × 10−65.3
3.0 ± 0.4−0.015
Diffusion controlled

Table 1.

Creep results of NiO, CoO and FeO*.

Denotation of symbols, see Eq. (2).

Tm – Melting temperature (K).

Figure 3.

Temperature dependence of diffusion coefficients [14, 17–19].

3.2. Creep of CoO

Taking into account both crystal structure and nonstoichiometry departure, CoO shows similarities to NiO. However, there is a major difference at low temperature (below 1170 K) and high oxygen pressure CoO is unstable and transforms to the spinel-type Co3O4 (Figure 4). Also the departure of stoichiometry, y, in Co1−yO is about 10 times higher than that of Ni1−yO. Traditional analysis of point defect structure in Co1−yO based on the ideal defect model with the assumption that point defects in Co1−yO are randomly distributed and do not interact with each other, leads to the conclusion that at high pO2 (close to CoO/Co3O4 border) the predominant ionic point defects are VCox and VCo′; at the intermediate region of pO2 both VCo′ and VCo″ coexist together as the predominant ionic point defects; and finally near the border Co/CoO the doubly ionized cobalt vacancies VCo″ are predominant [20]. However, the assumption of validity of ideal point defects in CoO is questionable. The ideal point defect model gives satisfactory results when nonstoichiometry departure and related point defect concentration is below 0.1 at%, for higher concentrations interaction between defects must be taken into account [21].

Figure 4.

Stability range of Co1−yO [6, 20].

The interaction between defects in Co1−yO can be well described by the Debye-Hückel approach [22]. In addition, the model proposed is based on the assumption that the only type of predominant ionic defects present in cobalt monoxide at elevated temperatures are double-ionized cation vacancies, VCo″ instead of two or even more types of ionic defects considered before. Despite the simplicity of the model, the agreement with the experiment is very good within the entire range of CoO stability.

Apart from the Debye-Hückel model, there is also another model making allowance for interaction between the defects which explains well the experimental data of CoO, in particular at high values of deviation from stoichiometric composition (i.e. close to the Co1−yO/Co3O4. This so called cluster model involves the formation of 4:1 clusters consisting of four double-ionized octahedral cobalt vacancies and one trivalent Co ion in tetrahedral interstitial position: [(VCo)4Coi]3− [23]. Figure 5 [20] shows the plots of electrical conductivity, σ, as a function of oxygen partial pressure and temperature. The dependences shown can be used to determine the reciprocal of oxygen exponent nσ = nh defined in Eq. (7a). The exact value of nh is needed in the interpretation of the creep rate versus pO2.

Figure 5.

Electrical conductivity, σ, as a function oxygen partial pressure and temperature [20].

The results of the creep studies of CoO single crystals [2428] and CoO polycrystals [14] are summarized in Table 1. A comparison of the activation energies for creep rate with oxygen self-diffusion obtained by Dubois et al. [15, 16] agrees only with a rather large uncertainty.

3.3. Creep of FeO

Iron monoxide, termed also as wüstite, has the NaCl-type structure. Compared to other binary oxides of iron-row metals, the wüstite phase exhibits the highest deviation from stoichiometry, varying from 4.3 at% at the Fe/Fe1−yO phase boundary up to 16.7 at% at the Fe1−yO/Fe3O4 interphase (Figure 6) [4, 5, 29]. The non-stoichiometry occurs because of the ease of oxidation of Fe2+ to Fe3+effectively replacing a small portion of Fe2+ with two-thirds their number of Fe3+, which take up tetrahedral positions in the close packed oxide lattice. The considerable concentration of defects, resulting from nonstoichiometry, leads to their strong interactions and formation of complexes. On the basis of neutron diffraction studies, Roth [30] has proposed the formation of defect complexes composed of two iron vacancies and interstitial iron VFe2Fei3+. This defect is similar to an element of the spinel structure of magnetite Fe3O4. Therefore, the Roth complexes can be formally considered as a magnetite-type defect or a submicrodomain of Fe3O4 in FeO [28, 31]. On the basis of X-ray studies, Koch and Cohen [32] have postulated that defects in Fe1−yO form associates even larger than Roth 2:1 complexes, composed of 13 iron vacancies and 4 interstitials (termed as cluster 13:4). The formation of the clusters was later confirmed by the neutron diffraction studies of Cheetham et al. [33, 34]. Catlow et al. [35, 36] using the computer simulation method have proposed various kinds of defect clusters such as 4:1, 6:2. 8:3, 10:4, 12:4 and 16:5. It has been postulated that the 4:1 cluster is a constructional unit in formation of higher order clusters. The cluster 16:5 resembles the magnetite structure and can be considered as a Fe3O4-type microdefect.

Figure 6.

Stability range of Feo1−yO [4, 5, 29].

The creep studies of FeO single crystals were performed by Ilschner et al. [37] and by Jolles and Monty [38]. The required parameter nh=n=ekαlnpO21(where α is Seebeck coefficient) needed to interpretation of the creep rate versus pO2 is presented in Figure 7. The results of the creep studies are summarized in Table 1.

Figure 7.

Seebeck coefficient, α, of Fe1−yO [31].

4. Zirconia-based materials

Zirconium dioxide, ZrO2 has three polymorphic modifications: monoclinic below 1440 K, tetragonal 1440–2640 K and cubic above 2640 K. The transition between them involves a large volume expansion cause a cracking upon cooling from high temperature, which is detrimental to the materials structural applications. The destructive phase transformation can be suppressed by total or partial stabilization of high temperature modifications (cubic or tetragonal form). This stabilization consists on the addition to ZrO2 several mole % of MgO, CaO or Y2O3 among others. The most popular stabilizer is Y2O3 termed as yttria.

Yttria-stabilized zirconia (YSZ) ceramics is a strategic functional material which has found extensive applications in electrochemical devices, such as gas sensors, solid oxide fuel cells and electrolysis cells.

Also the YSZ well known as an excellent construction material due to such properties as: high hardness, low wear resistance, low coefficient of friction, high elastic modules, chemical inertness, low thermal conductivity and high melting point [3942]. It is also recognized that the useful mechanical properties are obtained in multiphase material known as partially stabilized zirconia (PSZ). Garvie and Nicholson [43] have demonstrated that a fine-scale precipitate of monoclinic zirconia in a cubic stabilized matrix enhances the strength of PSZ. Very interested mechanical properties were discovered in fine-grained tetragonal ZrO2 stabilized with 3 mol% Y2O3 termed as 3Y-TZP [44, 45]. The macroscopic and microscopic behavior of 3Y-TZP can be characterized as structural or micrograin superplasticity, according to the definition used by metallurgists. The 170% elongation reported by Wakai et al. [44] on 3Y-TZP has been considered as evidence of ceramic superplasticity in the ceramic materials. 3Y-TZP, termed as ‘ceramic steel’ [46, 47], is now considered to be the model ceramic system. The fine grade size leads to a very dense, non-porous ceramic with excellent mechanical strength, corrosion resistance, impacttoughness, thermal shock resistance and very low thermal conductivity. Due to its characteristics Y-TZP is used in wear parts, cutting tools and thermal barrier coatings.

Also, electrical properties of 3Y-TZP are very interesting. At moderate temperatures below 970 K the grain interior of Y-TZP has higher conductivity [47, 48] than that of fully (YSZ) or partially stabilized (PSZ) zirconia [50]. However, the total conductivity of Y-TZP is lower due to the high contribution of grain boundary resistivity, known as the blocking effect [47, 49]. It was found that addition of Al2O3 leads considerable reduction of the blocking effect [50].

4.1. Defect structure of YSZ

The defect reactions in the yttria-stabilized zirconia can be written as:


The majority defect oxygen in yttria-stabilized zirconia are oxygen vacancies VOand yttrium ions Y3+ (YZrusing defect notation) occupying zirconium positions the electroneutrality conditions is given by:


Ionic conductivity of ZrO2 + 10 mol% Y2O3, termed as 10YSZ resulting from the Eq. (19) is illustrated in Figure 8 [51].

Figure 8.

Both ionic and electronic components of the electrical conductivity of yttria-stabilized zirconia (10YSZ) in the range 973–1173 K as a function of pO2, according to Weppner [51].

Combining Eqs. (16)(19) we can determine concentration of both electronic defects:




where KV and Ki are equilibrium constants of reactions (17) and (18), respectively. Dependences of electrons and electron holes conductivities are presented in Figure 8.

The possible minority defects are: zirconium interstitials Zriand zirconium vacancies VZr. They occupy positions in zirconium sublattice and form according to the following reactions:




Applying the mass action law to reactions (22) and (23) gives:




where K22 and K23 are the equilibrium constants of reactions (22) and (23), respectively.

4.2. Creep of single crystalline zirconia

Marcartney et al. [52] studied creep of single crystal zirconia stabilized with 12 mol% CaO within 1623–1723 K. They observed considerable climb and glide formation. Dominguez-Rodriguez et al. [5356] examined cubic YSZ (9.4–18 mol% Y2O3) single crystals. The determined activation energies of the deformation process were 646.4; 800.8 and 944.7 kJ/mol for 9.4, 12 and 18 mol% of yttria, respectively. Lankford [57] studied the deformation of two single crystals of YSZ containing 2.8 and 12 mol% Y2O3.The temperature range of the experiments was 296–1423 K. The plastic flow with rapid decrease in strength with increasing temperature was observed. The deformation was attributed to dislocation activity alone. Corman [58] examined the creep of single crystal 9.5 mol% yttria partially stabilized zirconia, within temperature range 1923–2123 K and stress from 12.5 to 100 MPa.

The stress exponent, m, and activation energy Q (Eq. (1)) were m = 4 and Q = 436 kJ/mol. This value is close to the lattice diffusion of Zr (418 kJ/mol). So, he concluded that cation diffusion is controlled the process deformation.

4.3. Creep of polycrystalline zirconia

The dependence of steady state creep rate, ε̇; on stress, σ; temperature, T and grain size, d of polycrystalline zirconia is given by a general relationship of the form:


where A is a dimensionless constant, G is the shear modulus, b is the Burgers vector, k is Boltzmann’s constant, p and m are constants termed the inverse grain size and stress exponent, respectively and D is the appropriate diffusion coefficient given by:


where Do is a frequency factor, Q is the appropriate activation energy and R is the gas constant.

Creep of polycrystalline zirconia was recently intensively studied. The subjects of interest were cubic stabilized zirconia, CSZ [5964], partial stabilized zirconia, PSZ [6567] as well as tetragonal zirconia polycrystals, TZP [44, 6873].

St Jacques and Angers [59] examined zirconia stabilized with 18 mol% CaO in the temperatre range 1470–1670 K and stress between 3.5 and 27.5 MPa. The parameter m in Eq. (26) was equal to 1, which suggested diffusionally controlled creep. The detailed study by Dimos and Kohlstedt [60] on a cubic 25YSZ indicated that the creep is controlled by the Nabarro-Herring diffusion mechanism with parameters m ≈ 1 and p ≈ 2. Wakai et al. [61, 63] reported that a stress exponent m ≈ 2 in an 8YSZ. Sharif et al. [64] studying a static grain growth claimed that cubic zirconia is prone to extensive grain growth.

Evans [66] studied deformation of yttria- and scandia- partially stabilized zirconia, PSZ (1436 < T < 1808 K; 4.1 < σ < 7.1 MPa). The activation energies were 373 and 360 kJ/mol for scandia and yttria, respectively, the parameter p = 2 was found, the parameter m was 1.5 for scandia stabilized zirconia and it assumed two values m = 1 and m = 6 for yttria. Seltzer, and Talty [67] studied Y-PSZ at high temperatures (up to 2270 K), they found m = 1.5 for fine-grained samples (d varied from 15 to 20 μm) and activation energy was 531 kJ/mol. Chevalier et al. [68] studied PSZ materials stabilized by MgO, they concluded that cavitations and microcracking by grain boundary sliding have been identified as the main creep mechanisms.

Wakai et al. [44] examined creep of 3Y-TZP within temperature range of 1423–1723 K. The stress exponents m = 1.5 at 1423 K and gradually increased with temperature reaching value m = 1.9 at 1723 K. The activation energy was 586 kJ/mol. Nauer and Carry [69] investigated the creep behavior TZP containing 2, 3 and 4 mol% Y2O3. At lower stresses (σ < 10 MPa) the parameters were: m = 2.4 and p = 1 and activation energy Q = 590 kJ/mol. At higher stresses ca. 100 MPa, the parameter m = 1. Authors proposed two different deformation regimes: an interface reaction controlled creep at low stresses and a grain boundary diffusion controlled creep at high stresses. Lakki et al. [70] studied 2Y-TZP material using two techniques the creep and the internal friction (it consists on applying a cyclic stress σ = σo cos (ωt) to a sample and measuring its response in the form of strain, ε). Both techniques provide at low stresses (< 15 MPa) close values of the activation energies and lead to conclusion that grain boundary sliding is the main deformation mechanism. Owen and Chokshi [71] and Chokshi [72] investigated 3Y-TZP. The experimental data over a wide range of stresses revealed a transition in stress exponent. Deformation at low and high stress regions was associated with m ≈ 3, p ≈ 1 and m ≈ 2, p ≈ 3, respectively. The activation energy was Q = 550 kJ/mol for both regions. Authors postulated that the interface reaction is controlled at low stress region and the grain boundary sliding at high stress region. Ghosh et al. [73] examined effect of silica additions on creep behavior of 3Y-TZP. The determined results were verified by tracer diffusion measurements. The creep data at high stresses are consisted with Coble diffusion and creep at lower stresses is attributed to interface-controlled diffusion mechanism. Addition of silica has only minor effect on both grain boundary and lattice diffusion. Ghost and Chokshi [74] studied the creep of nanocrystalline 3Y-TZP who obtained results indicating the same deformation mechanism as for micro-sized materials. Liu et al. [75] examined creep behavior of zirconia stabilized with 2.5 mol%. They postulated the grain boundary sliding accompanied by intergranular dislocation due to existence of amorphous phases.

5. Summary

The emphasis of this review was to compile existing data in the creep behavior of two types of oxides: iron-row group M1−yO (M = Ni, Co, Fe) which properties are strongly related with the oxygen partial pressure (pO2) dependent departure from stoichiometry (y) and superionic ZrO2-based materials. Two different approaches to creep methodology are used. In case of the transition metal oxides such as M1−yO the creep experiments required determination of the rate deformation (ε̇) as a function σ, T, pO2 and grain size (d) for polycrystalline materials. On the other hand, the oxide superionics such as stabilized zirconia concentration of ionic defects (VO) is fixed by the amount used stabilizer (usually Y2O3). Electronic defects (e′ and h) play role only in the extremely reduced or oxidizing conditions (usually very hard to achieve experimentally). Therefore, the creep rate is studied as a function σ, T and d in case of the polycrystals.

From this review several general trends in creep behavior emerge. Deformation of single crystals is typically controlled by dislocation glide on the most favorable slip system. On the other hand, deformation of polycrystalline oxides is controlled by diffusion of the slowest species along the fastest path, such as through the lattice, along grain boundaries or through a second phase formed at the grain boundaries. Dislocations play a more or less important role depending on the specific oxide.

Steady state creep of M1−yO appears to be controlled by oxygen diffusion through either oxygen vacancies or interstitials. On the other hand in case of stabilized zirconia it is controlled by cation diffusion (Zr4+ or Y3+). In any cases diffusion, involving both lattice and grain boundary data are needed to verification of proposed mechanisms. Recently used secondary ion mass spectrometry (SIMS) is suitable for this purpose [73, 7678].


This work was financially supported by the National Science Centre of the Republic of Poland, under Grant No 2016/23/B/ST8/00163. One of the author (MR) would like to thank to Professor J. Philibert- Head of the Laboratoire de Physique des Materiaux CNRS Bellevue and his coworkers: Dr. J. Castaing, Dr. C. Monty and Dr. E. Jolles for the opportunity to perform studies on creep of single crystals FeO in their labs.

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Krystyna Schneider and Mieczyslaw Rekas (December 20th 2017). High Temperature Creep of Metal Oxides, Creep, Tomasz Tanski, Marek Sroka and Adam Zielinski, IntechOpen, DOI: 10.5772/intechopen.70876. Available from:

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