Conduction mechanism investigation in YCa2Cu3Oδ colossal permittivity ceramics

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2025-04-29 DOI:10.1016/j.rinp.2025.108284

Wael Chouk , Mohamed Annabi , Mouldi Zouaoui

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引用次数: 0

Abstract

Sol-gel synthesized

Y {Ca}_{2} {Cu}_{3} O_{δ}

ceramic exhibits giant permittivity

ε_{r}^{'} \approx 10^{4}

, low loss

\tan δ 0.3

, and high stability over frequency and temperature. XRD revealed a tetragonal phase (P4/mmm). XPS confirmed high oxygen vacancy density. The structural heterogeneity, shown by SEM, between neighboring grains results from Schottky barrier formation at the grain boundaries, potentially explaining the TCR phenomenon. Magnetic analysis showed paramagnetism. Electrical property investigation revealed an insulating-to-metallic phase transition with temperature, associated with changing conduction mechanisms. Paramagnetic-insulating behavior at higher temperatures is linked to thermal activation, while electron scattering contributes to paramagnetic-metallic conduction at lower temperatures. The resistivity behavior follows the percolation model, providing insights into the interplay between conducting and insulating phases, relevant for optimizing perovskite-based materials in electronics and energy storage.

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YCa2Cu3Oδ巨介电常数陶瓷导电机理研究

溶胶-凝胶法制备的YCa2Cu3Oδ陶瓷具有大介电常数εr′≈104、低损耗tanδ0.3、高频率和温度稳定性等特点。XRD显示为四方相（P4/mmm）。XPS证实了高氧空位密度。扫描电镜显示，邻近晶粒之间的结构不均匀性是由晶界上的肖特基势垒形成造成的，这可能解释了TCR现象。磁性分析显示为顺磁性。电学性质的研究揭示了绝缘到金属的相变随温度的变化，与传导机制的变化有关。在较高温度下的顺磁绝缘行为与热激活有关，而电子散射有助于在较低温度下的顺磁金属传导。电阻率行为遵循渗透模型，为导电相和绝缘相之间的相互作用提供了见解，这与优化电子和储能中的钙钛矿基材料有关。

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

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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