Zn2V2O7 热钒酸盐中的相关势垒跳变输运和非德拜型介电弛豫

IF 5.1 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
Waqar Hussain Shah , Yousaf Iqbal , Muhammad Mushtaq , Muhammad Javed , Raheel Mumtaz , Ghulam Asghar , Anjam Waheed , MF Mohd Razip Wee
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引用次数: 0

摘要

本文采用传统固态反应技术合成了 Zn2V2O7 电陶瓷热钒酸盐,并在 700 °C 煅烧。X 射线衍射(XRD)证实,Zn2V2O7 热钒酸盐形成了单相结晶,具有 C12/c1 空间群的单斜结构。X 射线衍射粉末衍射曲线经里特维尔德细化分析,以研究化合物的结构细节。在 453-613 K 的温度范围内,在 83-2×106 Hz 的频域内进行了复阻抗分析,以研究材料中的电荷传导和介电弛豫机制。奈奎斯特图中的凹陷半圆通过配置 (RGCG)(RGBQGB) 的等效电路进行建模,解决了晶粒和晶界对材料传输特性的贡献问题。电导率光谱遵循琼舍尔幂律行为,频率指数的温度变化表明相关势垒跳变(CBH)是 Zn2V2O7 热钒酸盐体系中的传输机制。阻抗和模量虚部缩放行为的比较证明了弛豫时间分布与温度无关。虚电模量谱由 Kohlrausch、Williams 和 Watt 公式重现,拟合参数证实了介电弛豫的非德拜型性质。此外,还采用了哈维里亚克-内加米函数来研究材料的介电响应,结果发现该函数与阻抗、电导率和模量分析相一致。正切损耗的频率分散验证了跳变机制是由热激活的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Correlated barrier hopping transport and non-Debye type dielectric relaxation in Zn2V2O7 pyrovanadate
Herein, the Zn2V2O7 electro-ceramic pyrovanadate was synthesized via a conventional solid-state reaction technique and calcined at 700 °C. The single phase formation of Zn2V2O7 pyrovanadate crystallized in the monoclinic structure with C12/c1 space group was confirmed by X-ray diffraction (XRD). The XRD powder diffraction profile was analyzed by Rietveld refinement to investigate the structural details of the compound. The complex impedance analysis was carried out in the frequency domain of 832×106 Hz over a temperature range of 453–613 K to study the electrical charge conduction and dielectric relaxation mechanism in the material which revealed the presence of the distribution of relaxation times with thermal charge activation. Depressed semicircles in the Nyquist plots were modeled by an equivalent circuit with configuration (RGCG)(RGBQGB) which resolved the contributions of grains and grain boundaries towards the transport properties of the material. The electrical conductivity spectra followed Jonscher's power law behavior and the temperature variation of frequency exponent suggested correlated barrier hopping (CBH) as the governing transport mechanism in the Zn2V2O7 pyrovanadate system. The comparison between scaling behaviors of imaginary parts of impedance and modulus advocated the temperature-independent nature of relaxation time distribution. The imaginary electrical modulus spectra were reproduced by the Kohlrausch, Williams, and Watt formulism, and the fitted parameters confirmed the non-Debye type nature of the dielectric relaxation. Further, the Haveriliak-Negami function was employed to investigate the dielectric response of the material which was found to be consistent with impedance, conductivity, and modulus analyses. The frequency dispersion of the tangent loss verified that the hopping mechanism was thermally activated.
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来源期刊
Ceramics International
Ceramics International 工程技术-材料科学:硅酸盐
CiteScore
9.40
自引率
15.40%
发文量
4558
审稿时长
25 days
期刊介绍: Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.
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