Zhigao Hu

By Zhigao Hu, Yawei Li, Wenwu Li, Jiajun Zhu, Min Zhu, Ziqiang Zhu and Junhao Chu

Part of the book: Ferroelectrics

By Yawei Li, Zhigao Hu and Junhao Chu

Part of the book: Ferroelectrics

By Zhigao Hu, Junhao Chu, Yawei Li, Kai Jiang and Ziqiang Zhu

Part of the book: Advances in Ferroelectrics

By Kai Jiang, Liping Xu, Jinzhong Zhang, Zhigao Hu and Junhao Chu

Ferroelectrics systems are of great interest from the fundamental as well as applications points, such as ferroelectric random access memories, electro-optic switches and a number of electro-optic devices. Curie temperature (TC) is one of the important parameters of ferroelectrics for high-temperature applications. Particularly, the optical modes, which are associated with the ferroelectric to paraelectric phase transition, are of great interest. Structural transformations that alter the crystal symmetry often have a significant effect on the Raman spectroscopy. This chapter systematically studies the type ferroelectric oxides and rare earth element doped ferroelectric materials such as PbTiO3-Bi(Mg0.5Ti0.5)O3 (PT-BMT), Sr x Ba1−x Nb2O6 (SBN), Pb1−1.5x La x Zr0.42Sn0.4Ti0.18O3 (PLZST), Bi1−xLaxFe1−yTiyO3 (BLFT) and (K0.5Na0.5)NbO3-0.05LiNbO3 (KNN-LN) and so on synthesis of single crystal/ceramic and optical phonon vibration modes and the improvement of the Curie temperature characteristic using spectrometry measurements. The TC, distortion degree, and phase structure of the ferroelectric materials have been investigated by temperature-dependent Raman spectroscopy. Meanwhile, the important physical parameters exhibited a strong dependence on dopants resulting in structural modifications and performance promotion.

Part of the book: Raman Spectroscopy