高压下获得的陶瓷 Li0.12Na0.88TayNb1-yO3(y = 0.15、0.2、0.25)的电气特性与钽浓度的关系

IF 3 4区 材料科学 Q3 CHEMISTRY, PHYSICAL
Vadim Efremov, Mikhail Palatnikov, Olga Shcherbina, Diana Manukovskaya
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引用次数: 0

摘要

我们首次在高压和高温条件下获得了具有包晶体结构的铁电固溶体(即陶瓷)Li0.12Na0.88TayNb1-yO3(y = 0.15、0.2、0.25)。对它们的电物理特性进行了研究。结果表明,固溶陶瓷样品具有有序的扭曲晶体结构。作为温度、电荷载流子活化能和介电常数实部的函数,确定了静态比电导率值。已确定样品经历了多次连续相变。例如,P → R → S(T2)。研究发现,当钽的含量增加时,导电率也会增加。在整个研究温度范围内,Li0.12Na0.88Ta0.25Nb0.75O3 陶瓷样品的电导率值(接近于高离子电导率)在该类固溶体中都非常高。同时,该相是易变的,加热到居里温度以上会导致其逐渐破坏。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dependence of electrical properties on the concentration of tantalum in ceramics Li0.12Na0.88TayNb1-yO3 (y = 0.15, 0.2, 0.25) obtained at high pressure

We have obtained for the first time ferroelectric solid solutions (i.e. ceramic) Li0.12Na0.88TayNb1-yO3 (y = 0.15, 0.2, 0.25) with the perovskite structure under conditions of high pressures and temperatures. Their electrophysical characteristics have been studied. It has been established that the solid solutions ceramic samples have an orderly distorted crystal structure. The values of static specific conductivities have been determined as functions of temperature, the activation energy of charge carriers, and the real part of the permittivity. It has been established that the samples experience a number of successive phase transitions. For example, P → R → S(T2). It has been found that the electrical conductivity increases when the content of tantalum increases. The Li0.12Na0.88Ta0.25Nb0.75O3 ceramic sample has atypically high electrical conductivity values (close to high ionic conductivity) for this class of solid solutions over the entire studied temperature range. At the same time, the phase is metastable, and heating above the Curie temperature leads to its gradual destruction.

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来源期刊
Solid State Ionics
Solid State Ionics 物理-物理:凝聚态物理
CiteScore
6.10
自引率
3.10%
发文量
152
审稿时长
58 days
期刊介绍: This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.
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