Investigation of dielectric transitions and impedance behavior in solid solutions of (1-x) K₀.₄₁Na₀.₅₉Nb₀.₉₅₉Sb₀.₀₄₁O₃-x(Bi₀.₅K₀.₅TiO₃), synthesized by solid state reaction method

IF 2.1 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS
Radheshyam Rai, Pratiksha Agnihotri, Shilpa Kumari, Mrinal Dutta
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Abstract

In this study, we present the results of structural, impedance, modulus and conductivity analysis of (1-x) K0.41Na0.59Nb0.959Sb0.041O3-x(Bi0.5K0.5TiO3) (x = 0.01, 0.03, 0.05 and 0.07) (KNNS-BKT) polycrystalline ceramics prepared by the conventional solid-state reaction technique. The X-ray diffraction pattern (XRD) for all synthesized polycrystalline samples confirmed the formation of a pure perovskite phase. KNNS-BKT ceramics exhibit an orthogonal-tetragonal phase boundary at room temperature for composition x = 0.01 and 0.03. In the KNNS system, BKT induces a diffuse transition, but no significant shift in To−t and Tt-c with frequency is observed. A slight variation in lattice parameters was observed at different concentration of x in KNN-BKT ceramics. The average crystalline size and lattice strain of KNNS-BKT ceramics were evaluated by using the Williamson-Hall plot to study the composition dependence. The dielectric constant (ε) increased with higher concentration. All samples exhibited a NTCR semiconducting nature.

(1-x) K₀₄₁Na₀.₅₉Nb₀.₅₉Sb₀.₀₄₁O₃-x(Bi₀.₅K₀)的介电跃迁和阻抗行为研究₅TiO₃),采用固相反应法合成
本文报道了采用传统固相反应技术制备的(1-x) K0.41Na0.59Nb0.959Sb0.041O3-x(Bi0.5K0.5TiO3) (x = 0.01, 0.03, 0.05和0.07)(KNNS-BKT)多晶陶瓷的结构、阻抗、模量和电导率分析结果。所有合成的多晶样品的x射线衍射图(XRD)证实了纯钙钛矿相的形成。当成分x = 0.01和0.03时,KNNS-BKT陶瓷在室温下呈现正交四方相界。在KNNS系统中,BKT诱导了扩散跃迁,但没有观察到To - t和Tt-c随频率的显著位移。在不同的x浓度下,KNN-BKT陶瓷的晶格参数有轻微的变化。利用Williamson-Hall图分析了KNNS-BKT陶瓷的平均晶粒尺寸和晶格应变。介电常数(ε)随浓度的增加而增大。所有样品均表现出NTCR半导体性质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of the Australian Ceramic Society
Journal of the Australian Ceramic Society Materials Science-Materials Chemistry
CiteScore
3.70
自引率
5.30%
发文量
123
期刊介绍: Publishes high quality research and technical papers in all areas of ceramic and related materials Spans the broad and growing fields of ceramic technology, material science and bioceramics Chronicles new advances in ceramic materials, manufacturing processes and applications Journal of the Australian Ceramic Society since 1965 Professional language editing service is available through our affiliates Nature Research Editing Service and American Journal Experts at the author''s cost and does not guarantee that the manuscript will be reviewed or accepted
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