A study on BaTiO3 – NiFe2O4 composite; microstructure, multiferroic and magnetodielectric properties

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2024-10-16 DOI:10.1016/j.matchemphys.2024.130044

Ali Soleimani, Mehdi Delshad Chermahini, Sobhan Yavari

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Abstract

The lead-free x NiFe₂O₄ – (1-x) BaTiO₃ (x = 0, 0.05, 0.1, 0.15) multiferroic composites were prepared via the solid-state sintering technique. Microstructure, multiferroic, and magnetodielectric properties of composites were investigated. According to the XRD data (from x = 5 to 15 wt%), the tetragonality factor (c_T/a_T) and unit cell volume of the BaTiO₃ (BTO) crystal system diminished. Based on SEM images, ferromagnetic NiFe₂O₄ (NFO) grains are uniformly dispersed in the ferroelectric BTO matrix without additional reaction in the interfaces of two phases. The highest values of dielectric (dielectric constant (ε_r) ∼ 1905 and dielectric loss factor (tan δ) ∼ 0.049) and ferroelectric properties (saturation polarization (P_S) ∼ 13 μC/cm² and remnant polarization (P_r) ∼ 10 μC/cm²) are attained for x = 5 wt% due to the lowest NFO (non-ferroelectric) concentration. Also, with increasing ferrite concentration (up to 15 wt%), the ferroelectric properties of the composites show a gradual decrease. The saturation magnetization (M_S) values rise due to increasing ferrite concentration (from 2 to 5 emu/g for x = 5 to 15 wt%). Moreover, coercivity (H_C) drops from 150 to 110 Oe. The simultaneous observation of the ferroelectric and ferromagnetic characteristic hysteresis loops confirmed the multiferroic effect for x = 5, 10, and 15 wt%. The highest magnetodielectric constant (3 %) is obtained for x = 15 wt% multiferroic composite at the applied magnetic field of 6 kOe.

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关于 BaTiO3 - NiFe2O4 复合材料；微观结构、多铁和磁电性能的研究

通过固态烧结技术制备了无铅 x NiFe2O4 - (1-x) BaTiO3 (x = 0, 0.05, 0.1, 0.15) 多铁氧体复合材料。研究了复合材料的微观结构、多铁和磁电性能。根据 XRD 数据（从 x = 5 到 15 wt%），BaTiO3 (BTO) 晶系的四方性因子（cT/aT）和单胞体积减小。根据 SEM 图像，铁磁性 NiFe2O4（NFO）晶粒均匀地分散在铁电性 BTO 基体中，两相界面没有发生额外反应。由于 NFO（非铁电性）浓度最低，当 x = 5 wt% 时，介电性能（介电常数 (εr) ∼ 1905 和介电损耗因子 (tan δ) ∼ 0.049）和铁电性能（饱和极化 (PS) ∼ 13 μC/cm2 和残余极化 (Pr) ∼ 10 μC/cm2）达到最高值。此外，随着铁氧体浓度的增加（最高达 15 wt%），复合材料的铁电特性逐渐下降。饱和磁化（MS）值随着铁氧体浓度的增加而上升（x = 5 至 15 wt%，从 2 到 5 emu/g）。此外，矫顽力（HC）从 150 Oe 下降到 110 Oe。同时观察铁电和铁磁特性磁滞回线证实了 x = 5、10 和 15 wt% 时的多铁效应。在 6 kOe 的外加磁场下，x = 15 wt% 的多铁性复合材料获得了最高的磁介电常数（3%）。

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.