Structural and dielectric properties of microwave dielectric materials xBa(Zn1/3Ta2/3)O3 - (1-x)La(Zn1/2Ti1/2)O3

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Electroceramics Pub Date : 2023-01-04 DOI:10.1007/s10832-022-00300-y

Ram Awdhesh Kumar, Alo Dutta, T. P. Sinha

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引用次数: 1

Abstract

The structural, vibrational and microwave dielectric properties of xBa(Zn_1/3Ta_2/3)O₃ - (1-x)La(Zn_1/2Ti_1/2)O₃ [x = 1, 0.7, 0.5, 0.3 and 0] are investigated. The materials are synthesized by the solid-state reaction technique. The crystal structure of the materials is obtained from the Rietveld refinement of the X-ray diffraction (XRD) profile. All other materials except Ba(Zn_1/3Ta_2/3)O₃ (x = 1) are crystallized in monoclinic P2₁/n symmetry. The crystal structure of Ba(Zn_1/3Ta_2/3)O₃ is trigonal with P-3m1 space group. The vibrational properties of the materials obtained from Raman spectroscopy are correlated with the structural parameters. The microwave dielectric constant ε_r is maximum for x = 0.5 whereas the quality factor Q.f is maximum for x = 1. The effects of vibrational and structural parameters on the microwave dielectric properties are discussed in detail. The dielectric relaxation and the Ac conductivity of the materials are also studied using the alternating current impedance spectroscopy in the frequency range from 50 Hz to 5 MHz.

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微波介质材料xBa(Zn1/3Ta2/3)O3 - (1-x)La(Zn1/2Ti1/2)O3的结构和介电性能

研究了xBa(Zn1/3Ta2/3)O3 - (1-x)La(Zn1/2Ti1/2)O3 [x = 1,0.7, 0.5, 0.3和0]的结构、振动和微波介电性能。该材料采用固相反应技术合成。材料的晶体结构由x射线衍射(XRD)谱的Rietveld细化得到。除Ba(Zn1/3Ta2/3)O3 (x = 1)外，其余材料均呈单斜P21/n对称结晶。Ba(Zn1/3Ta2/3)O3的晶体结构为三角形，具有P-3m1空间群。拉曼光谱分析得到的材料的振动特性与结构参数相关。微波介电常数εr在x = 0.5时最大，品质因子Q.f在x = 1时最大。详细讨论了振动参数和结构参数对微波介电性能的影响。利用交流阻抗谱在50hz ~ 5mhz的频率范围内研究了材料的介电弛豫和交流电导率。

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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.