ABSTRACT Methods to improve dielectric and piezoelectric properties of ferroelectric ceramics with high Curie temperatures (TC > 700 K) are discussed. In the first method improving the electrophysical properties is achieved due to a change in technology of the synthesis of powders of ferroelectric phases, and a proposed technological mode enables one to keep a composition of these powders due to a decrease of temperature of the synthesis of the chemically active powders and to a decrease of temperature of sintering. In this method high-temperature ferroelectric ceramics based on the Aurivillius phases are characterised by the piezoelectric coefficient d33 ≤ 40 pС / N and dielectric permittivity ϵT33/ϵ0≤ 230. The second method is concerned with ferroelectric phases of PbTiO3 – PbZrO3 – Bi4Ti3О12 – МеТiO3 (Ме = Са, Sr, Ва), and on this basis ceramics are formed with larger piezoelectric parameters and TC > 700 K. Temperature of the synthesis of powders based on ferroelectric phases, obtained using the low-temperature method, is lower by 430 K on the average, at reducing the process time range by more than 3 times.

中文翻译：

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由含双层结构相的纳米级粉末制成的铁电陶瓷

摘要讨论了在高居里温度 (TC > 700 K) 下改善铁电陶瓷介电和压电性能的方法。在第一种方法中，由于铁电相粉末合成技术的改变，实现了电物理性能的改善，并且所提出的技术模式使人们能够由于合成铁电相的温度降低而保持这些粉末的组成。化学活性粉末和降低烧结温度。在这种方法中，基于 Aurivilius 相的高温铁电陶瓷的特征在于压电系数 d33 ≤ 40 pС / N 和介电常数 ϵT33/ϵ0≤ 230。第二种方法涉及 PbTiO3 – PbZrO3 – Bi4Ti3О12 – O3МеФ的铁电相(Ме = Са, Sr, Ва),