Dielectric response of spinel based magnetic oxide of Mn, Cr, Co, Fe and Al as a function of frequency and temperature

IF 3 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Applied Physics A Pub Date : 2026-10-06 DOI:10.1007/s00339-026-10321-x

Sanjula Pradhan, Chinmaya Mohapatra, Rachana Sain, Chandan Upadhyay, Nand Kishore Prasad

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Abstract

This study focuses on the design of a spinel structured high-entropy oxide (HEO) (Mn_0.6Cr_0.6Co_0.6Fe_0.6Al_0.6)O₄ that is obtained after sintering at 900 °C in an open atmosphere. The cation disorder as well as local lattice distortions due to the presence of multivalent cations in this HEO influenced both ferrimagnetic and dielectric characteristics. The Rietveld analysed X-ray diffraction pattern confirmed the presence of spinel structured HEO along with the rhombohedral Cr₂O₃ phase. The scanning electron microscopy analysis proposed a homogeneous distribution of all the cations in the sample, and its average size was found to be 0.112 ± 0.023 μm. A thorough dielectric analysis of the sample displayed a higher value of dielectric constant, thermally triggered dielectric response with regulated losses at higher temperatures. The non-Debye type relaxation behaviour of the sample could be attributed to its structural disorder as well as the presence of multivalent cations.

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尖晶石基Mn、Cr、Co、Fe和Al磁性氧化物的介电响应随频率和温度的变化

本研究的重点是设计一种尖晶石结构的高熵氧化物（HEO）（Mn0.6Cr0.6Co0.6Fe0.6Al0.6）O4，该氧化物是在开放气氛下900℃烧结后获得的。阳离子无序性以及多价阳离子引起的局部晶格畸变影响了HEO的铁磁和介电特性。Rietveld分析的x射线衍射图证实了尖晶石结构HEO的存在以及菱形Cr2O3相的存在。扫描电镜分析表明，样品中阳离子分布均匀，其平均尺寸为0.112±0.023 μm。对样品进行彻底的介电分析显示出较高的介电常数值，热触发的介电响应在较高温度下具有可调节的损耗。样品的非德拜型弛豫行为可归因于其结构紊乱以及多价阳离子的存在。

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

Applied Physics A 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.40%

发文量

964

审稿时长

38 days

期刊介绍： Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.