其他名称：
24-22-00415
项目负责人：
Boldyrev Nikita
发表日期：
2024
主持机构：
Southern Federal University,
国家：
俄罗斯
开始日期：
2024
结束日期：
2025
简介：
Piezoelectric materials that convert electrical energy into mechanical stress (and vice versa) are widely used in modern technology in a variety of drives, sensors, generators, actuators and converters. At the same time, due to its excellent characteristics (in particular, the piezoelectric modulus d33 over 450 pC/N), polarized piezoceramics based on lead zirconate-titanate (PZT, PbZrxTi1-xO3) have become the most widely used. At the same time, in recent decades, in connection with the development of mechanical engineering, aerospace and oil industries, quite a lot of new potential applications for piezoelectrics have appeared in the region of extreme temperatures (> 350 ° C) exceeding the Curie temperature of PZT ceramics (250 ° C - 380 ° C) . This creates new challenges for materials science and makes it relevant to search for new piezoactive materials with extended operating ranges. However, this is the only disadvantage of PZT ceramics. Another disadvantage of this material is the high lead content, which poses an environmental hazard. Most of the potential problems with PZT are not related to the stable compound at room temperature, but to the manufacturing process that vaporizes the lead oxide at high temperatures and the disposal of this material. The need to minimize harm to the environment, as well as new production challenges, over the past decades have stimulated the search for new lead-free materials with comparable characteristics. Research in this area has resulted in the development of a number of piezoelectric materials such as (K,Na)NbO3 (KNN); Na1/2Bi1/2TiO3 (NBT); (Ba,Ca)(Zr,Ti)O3 (BCZT) and BiFeO3-BaTiO3 (BFBT). Each of these alternatives has both strengths and weaknesses, while being inferior to PZT ceramics.$The BFBT binary system is very promising due to the rather high Curie temperature due to the presence of bismuth ferrite multiferoic (BF, TC~830°C, TN~370°C). The high electrical conductivity of BF does not allow its use in devices directly. However, the creation of solid solutions based on it and modification can not only eliminate the disadvantages of BF, but also significantly improve the electrical properties of the resulting materials. At the moment, there are quite a few publications devoted to various modifications of the BFBT binary system. However, in order to achieve electrophysical parameters comparable with PZT ceramics and understand the physical processes that cause them, it is necessary to conduct a comprehensive study within the framework of one project, combining bibliographic/patent search, crystal chemical substantiation of the choice of modifiers for a binary system (based on the tolerance factor), selection of dopant concentrations and components of the solid solution, as well as step-by-step optimization of the regulations for the synthesis and sintering of ceramic objects, which will be the aim of this work.
专业领域：
材料科学
语种：
英语
