PROSPECTS FOR THE DEVELOPMENT OF METHODS FOR SYNTHESIZING PEROVSKITE STRUCTURE TITANATES AND DOPING THEM WITH RARE-EARTH ELEMENTS

V. Cherepov, A. Kropachev, O. N. Budin
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Abstract

The paper presents an overview of methods for obtaining perovskite structure titanates and doping them with rare-earth elements. The results of scientific research conducted by authors from different countries related to the study of the effect of doping perovskite structure titanates with rare-earth elements on their electromagnetic properties are discussed. The paper also comprises information on the use of perovskite structure titanates in various industries. As exemplified by barium titanate (BaTiO3), a comparative analysis of some morphological properties (particle size, structure) and electromagnetic characteristics (dielectric constant, Curie temperature, modulus of longitudinal oscillations (d33)) of powders obtained (and doped) by different methods is carried out. Techniques for various BaTiO3 preparation methods such as solvothermic, hydrothermal, sol-gel, chemical deposition, and solid-phase sintering are described. The paper provides the results of studies on the effect of changes in process parameters (temperature, pH, composition of the initial mixture of materials and concentration of reagents) on the phase, morphology and BaTiO3particle formation rate in hydrothermal synthesis (using BaCl2, TiCl4and NaOH as initial materials). In addition, experiments were conducted to study the effect of microwave radiation power in ВаСОз and ТЮ2 solid-phase sintering on the dielectric and ferroelectric properties of ВаТЮз ceramics. The analysis of methods for obtaining BaTiO3 and doping it with rare-earth elements found that at present the hydrothermal method and the method of solid-phase sintering (including with microwave radiation) can be regarded as advanced technologies for obtaining perovskite structure materials with predetermined properties.
展望了钙钛矿结构钛酸盐的合成及稀土元素掺杂方法的发展
本文综述了钙钛矿结构钛酸盐的制备方法和稀土元素掺杂方法。本文讨论了国内外有关掺杂稀土元素的钙钛矿结构钛酸盐对其电磁性能影响的研究成果。本文还包括钙钛矿结构钛酸盐在各种工业中的使用信息。以钛酸钡(BaTiO3)为例,对比分析了不同方法制备(和掺杂)的钛酸钡粉体的一些形态特性(粒度、结构)和电磁特性(介电常数、居里温度、纵向振荡模量(d33))。介绍了溶剂热法、水热法、溶胶-凝胶法、化学沉积法和固相烧结法等制备BaTiO3的技术。本文提供了水热合成(以BaCl2、ticl4和NaOH为初始材料)过程中工艺参数(温度、pH、初始材料混合物组成和试剂浓度)变化对物相、形貌和batio3颗粒形成速率影响的研究结果。此外,通过实验研究了ВаСОз和ТЮ2固相烧结过程中微波辐射功率对ВаТЮз陶瓷介电性能和铁电性能的影响。通过对制备BaTiO3并掺杂稀土元素的方法分析发现,目前水热法和固相烧结法(包括微波辐射法)是制备具有预定性能的钙钛矿结构材料的先进技术。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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