Na0.5Bi0.5TiO3陶瓷中氧空位引起的介电弛豫

IF 0.9 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Condensed Matter Physics Pub Date : 2023-01-04 DOI:10.5488/CMP.25.43705
V. Sidak, M. Trubitsyn, T. Panchenko
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引用次数: 0

摘要

研究了弛豫铁电铋-钛酸钠(Na0.5Bi0.5TiO3)陶瓷的介电常数。对真空烧结和热处理样品进行了测量。在烧结样品中观察到与结构相变相关的扩散介电异常。真空热处理后出现了介电常数峰值(εmax ~ 104)。ε(T)的异常是由慢极化过程(f < 10 kHz)引起的,并且是不稳定的,在空气中加热到~ 800 K时消失。用Cole-Cole模型描述了ε的温度和频率依赖关系,并考虑了非稳定极化的热激衰减。假设介电异常是由空间电荷极化机制决定的。氧空位VO••和定位在钛离子Ti’Ti上的电子被认为是观察到的现象的原因。
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Dielectric relaxation induced by oxygen vacancies in Na0.5Bi0.5TiO3 ceramics
Dielectric permittivity was studied in ceramics of relaxor ferroelectric bismuth-sodium titanate Na0.5Bi0.5TiO3. The measurements were performed on as sintered and heat treated in vacuum samples. The diffuse dielectric anomalies associated with the structural phase transitions were observed in as sintered samples. The intense peak of permittivity (εmax ∼ 104) appeared after heat treating in vacuum. The anomaly of ε(T) was contributed by slow polarization processes (f < 10 kHz) and was non-stable, vanishing on heating in air up to ∼ 800 K. Temperature and frequency dependencies of ε were described by using Cole-Cole model with accounting thermally stimulated decay of the non-stable polarization. It is supposed that the dielectric anomaly is determined by space charge polarization mechanism. Oxygen vacancies VO•• and electrons localized on titanium ions Ti'Ti are assumed to be responsible for the phenomenon observed.
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来源期刊
Condensed Matter Physics
Condensed Matter Physics 物理-物理:凝聚态物理
CiteScore
1.10
自引率
16.70%
发文量
17
审稿时长
1 months
期刊介绍: Condensed Matter Physics contains original and review articles in the field of statistical mechanics and thermodynamics of equilibrium and nonequilibrium processes, relativistic mechanics of interacting particle systems.The main attention is paid to physics of solid, liquid and amorphous systems, phase equilibria and phase transitions, thermal, structural, electric, magnetic and optical properties of condensed matter. Condensed Matter Physics is published quarterly.
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