Change in conduction mechanism from Mott variable range to small polaronic hopping in Sr2+ doped Y2 − xSrxNiMnO6.

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

Journal of Electroceramics Pub Date : 2023-08-19 DOI:10.1007/s10832-023-00328-8

Syeda Arooj Fatima, R. Shaheen, Amjad Mehmood, Ruzma Riaz, K. Shahzad

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Abstract

The effect of Sr²⁺ doping on electrical conductivity and dielectric constant was studied in Y_2 − xSr_xNiMnO₆ (YSNMO). Rietveld refinement of XRD data showed the coexistence of monoclinic (P21/n) and rhombohedral (R\(\bar 3\)) as major and minor phases, respectively. Impedance analysis of YSNMO was performed to investigate the presence of various electro-active regions, electrical conduction mechanisms and the origin of the colossal dielectric constant in wide temperature (83-303 K) and frequency (40 Hz-6 MHz) ranges. An equivalent circuit model (R_gC_g)(R_gbQ_gb)(R_eQ_e) has been proposed to correlate the electrical properties. The R_g and R_gb obtained using ZView fitting revealed the semiconducting nature of the sample. The transition in the conduction mechanism from variable range hopping to small polaronic hopping was observed at about 213 K. DC bias measurements, which followed the Mott-Schottky law, confirmed the existence of non-Ohmic electrode contact. The dielectric spectra of ceramic were described using the modified Cole-Cole equation. The frequency dependent ac conductivity was investigated with the Jonscher’s power law.

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Sr2+掺杂Y2从Mott变程到小极化子跳跃的传导机制变化 − xSrxNiMnO6。

研究了在 Y2 - xSrxNiMnO6 (YSNMO) 中掺杂 Sr2+ 对导电性和介电常数的影响。XRD 数据的里特维尔德细化表明，单斜（P21/n）和斜方体（R\(\bar 3\) ）分别作为主要和次要相共存。对 YSNMO 进行了阻抗分析，以研究在较宽的温度（83-303 K）和频率（40 Hz-6 MHz）范围内各种电活性区的存在、电传导机制和巨大介电常数的来源。我们提出了一个等效电路模型 (RgCg)(RgbQgb)(ReQe) 来关联电气特性。利用 ZView 拟合得到的 Rg 和 Rgb 揭示了样品的半导体性质。直流偏置测量遵循莫特-肖特基定律，证实了非欧姆电极接触的存在。陶瓷的电介质光谱是用修正的科尔-科尔方程描述的。用容舍尔幂律研究了与频率相关的交流电导率。

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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.