Application Of Rare Earth Functional Ceramics

With the development of materials science in recent years, concern functional composite ceramics, rare earth doped in the development of this powerful new composite ceramic also made great progress. Zhejiang University Chen Ang, etc., using conventional methods for preparing functional ceramics, YBa2Cu3O7-x and BaTiO3 ferroelectric ceramic composite obtained YBa2Cu3O7-x-BaTiO3 composite ceramics ferroelectricity and superconductivity coexist, its conductance characteristics in line with the three-dimensional conductive behavior, and when the content was higher YBa2Cu3O7-x superconductivity. Huazhong University of Science Zhou Dongxiang and other studies have pointed out, LaCoO3-SrCoO3 system and LaCrO3-SrCrO3 composite ceramics can be used as electrode material magnetic fluid motor and gas-sensitive materials; and in the NTC thermistor ceramic composites NiMn2O4-LaCrO3, the new compound LaMnO3 conductive phase determines the main properties of ceramics. Zou Qin et Xi'an Jiaotong University by Y3 +, La3 + on (Sr, Ca) TiO3 doped with rare earth ions, eliminating the original with an alkali metal ion (Nb5 +, Ta5 +) coating and thermal diffusion process, and the system high density ceramic material obtained, good process performance, and maintain a low resistivity (ρ is 10-2Ω / cm order of magnitude), high non-linear (non-linear coefficient α> 10) dielectric - varistor multifunction features .