Effect of Cu2+ substitution on structural, electrical and dielectric properties of bismuth vanadate by impedance spectroscopic studies

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2022-08-06 DOI:10.1007/s10832-022-00290-x

Suhas M. Desai, Sunil S. Shewale, Shreyas. S. Pansambal, Nilesh P. Barde, Pranav P. Bardapurkar

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引用次数: 1

Abstract

Polycrystalline samples of Bi₄V_2(1-x)Cu_2xO_11-3× were prepared by solid state reaction method. Thrust of the work is to stabilize high temperature conducting γ-phase at room temperature. XRD and DSC analysis indicates orthorhombic ‘α’ phase for x ≤ 0.08 to tetragonal γ-phase transition for x = 0.1, at room temperature. Variations of real and imaginary impedance as well as complex electrical modulus with frequency are reported. Experimental impedance spectroscopic data was theoretically fitted and equivalent circuits are proposed. Nyquist plots revealed contribution from grain as well as interface. Variations of impedance, dielectric permittivity and AC conductivity as a function of frequency at selected temperatures are reported. The AC conductivity was fitted with Jonscher’s power law and the power law exponent (η) was found to be < 1, indicating that the conduction process follows CBH mechanism. The dielectric behaviour was found to follow UDR model. Cu²⁺ ions was observed to introduce defects and oxygen vacancies, space charge accumulation, reduction in dielectric permittivity and increase in the conductivity as high as up to 0.45 S·cm⁻¹ for the expected γ-phase.

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用阻抗谱研究Cu2+取代对钒酸铋结构、电学和介电性能的影响

采用固相反应法制备了Bi4V2(1-x) cu2xo11 - 3x多晶样品。工作的重点是在室温下稳定高温导电γ相。XRD和DSC分析表明，在室温下，正交α相为x≤0.08，四方γ相为x = 0.1。报道了实、虚阻抗以及复电模量随频率的变化。对实验阻抗谱数据进行了理论拟合，并提出了等效电路。奈奎斯特图揭示了颗粒和界面的贡献。报告了在选定温度下阻抗、介电常数和交流电导率随频率的变化。交流电导率符合Jonscher幂律，幂律指数(η) = 1，表明导电过程遵循CBH机制。发现介电行为符合UDR模型。Cu2+离子引入了缺陷和氧空位、空间电荷积累、介电常数降低和电导率增加，预期γ相的电导率高达0.45 S·cm−1。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.