Investigation of optical, magnetic, dielectric and electrical properties in BiFeO3-SrTiO3-NaNbO3 ceramic composites

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

Applied Physics A Pub Date : 2026-10-09 DOI:10.1007/s00339-026-10323-9

M. Sudhadhar, Venkateswara Rao Mannepalli, V. Sudharshan, G. Bhavani, B. Sattibabu, P. Kanaka Raju, K. Lakshun Naidu, D. Tirupathi Swamy, T. Durga Rao

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引用次数: 0

Abstract

Polycrystalline (1–x)(0.7BiFeO₃–0.3SrTiO₃)–xNaNbO₃ ceramics (x = 0.00, 0.10, 0.20, and 0.30) were synthesized using a conventional solid-state reaction route. Structural analysis based on Rietveld refinement of X-ray diffraction data confirmed the coexistence of rhombohedral and tetragonal phases in all compositions. The enhanced optical band gap from 2.16 to 2.24 eV was observed with the increase in NaNbO₃ content. With the increase of NaNbO₃ content, the modification in the magnetic exchange interactions was observed and as a result, changes in the remanent magnetization and coercive field were observed. Frequency-dependent dielectric studies, impedance spectroscopy and AC conductivity analyses indicated the enhanced insulating behaviour and low loss values with the increase in NaNbO₃ content. The observed electrical transport was found to be governed by oxygen-vacancy migration mechanisms. These results demonstrate that NaNbO₃ incorporation is a promising approach to tuning the characteristics of multifunctional materials.

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BiFeO3-SrTiO3-NaNbO3陶瓷复合材料的光学、磁性、介电和电学性能研究

采用传统的固相反应路线合成了多晶（1-x）（0.7BiFeO₃-0.3SrTiO₃）-xNaNbO₃陶瓷（x = 0.00, 0.10, 0.20和0.30）。基于x射线衍射数据的Rietveld细化的结构分析证实了所有成分中菱形和四方相的共存。随着NaNbO₃含量的增加，光学带隙从2.16 eV增大到2.24 eV。随着NaNbO3含量的增加，观察到磁交换相互作用的改变，从而观察到剩余磁化强度和矫顽力场的变化。频率相关的介电研究、阻抗谱和交流电导率分析表明，随着NaNbO₃含量的增加，绝缘性能增强，损耗值降低。观察到的电输运是由氧空位迁移机制控制的。这些结果表明，NaNbO₃的掺入是一种很有前途的方法来调整多功能材料的特性。

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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.