高压合成的钙钛矿型RbTaO3的介电性能取决于晶体结构

IF 3.3 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Dalton Transactions Pub Date : 2025-01-10 DOI:10.1039/D4DT03207A

Kimitoshi Murase, Jun-ichi Yamaura, Yousuke Hamasaki, Takeharu Kato, Hajime Sagayama and Ayako Yamamoto

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引用次数: 0

摘要

我们成功地在1173 K和4 GPa条件下合成了钙钛矿型rbta3。与在相同条件下制备的正交钙钛矿型RbNbO3相比，在300 K下，RbNbO3结晶为立方体系（Pm-3m空间群（SG）， a = 4.04108(3) Å）。在冷却过程中，在270 K时可逆地转变为四方相（SG: P4mm），在80 K时可逆地转变为正交相（SG: Amm2）。与相变相对应，相对介电常数在270 K处达到峰值，最大值约为2000，在80 K处出现扭结。这种转变方案类似于众所周知的位移型铁电体BaTiO3和KNbO3。这与KTaO3形成了对比，KTaO3在最低温度下保持了立方系统和量子准电性质。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Dielectric properties depend on the crystal structure of perovskite-type RbTaO3 synthesized at high pressure†

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Dielectric properties depend on the crystal structure of perovskite-type RbTaO3 synthesized at high pressure†

We successfully synthesized perovskite-type RbTaO₃ at 1173 K under 4 GPa. RbTaO₃ crystalized as a cubic system (Pmm space group (SG), a = 4.04108(3) Å) at 300 K in contrast to the orthorhombic perovskite-type RbNbO₃ prepared under the same conditions. During the cooling process, it reversibly transformed into a tetragonal phase (SG: P4mm) at 270 K, and into an orthorhombic phase (SG: Amm2) at 80 K. Corresponding to the phase transition, the relative permittivity showed a peak at 270 K with a maximum value of approximately 2000 and a kink at 80 K. This transition scheme is analogous to well-known displacement-type ferroelectrics of BaTiO₃ and KNbO₃. This is in contrast to KTaO₃, which retains a cubic system and quantum paraelectric properties at the lowest temperature.

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来源期刊

Dalton Transactions 化学-无机化学与核化学

CiteScore

6.60

自引率

7.50%

发文量

1832

审稿时长

1.5 months

期刊介绍： Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.