Room temperature multiferroic properties and polymorphic phase transition-induced noticeable magnetodielectric anomalies in Fe/Co co-doped (K0.52Na0.48)NbO3 ceramics
Room temperature multiferroic properties and polymorphic phase transition-induced noticeable magnetodielectric anomalies in Fe/Co co-doped (K0.52Na0.48)NbO3 ceramics
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Fe/Co 共掺杂 (K0.52Na0.48)NbO3 陶瓷中的室温多铁性和多晶型相变引起的显着磁介电异常
DOI：
10.1016/j.jallcom.2020.155519
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发表时间：
2020-09
影响因子：
6.2
通讯作者：
Wang Qiuping
中科院分区：
文献类型：
--
作者：
Zhou Min;Lu Xiaomei;Liu Lin;Wang Junjun;Lu Dingze;Huang Fengzhen;Zhu Jinsong;Cheng Pengfei;Wang Qiuping
采用固相反应法制备了（K0.52Na0.48） nbn -x(FeCo)xO3（0≤x≤0.02）的多晶陶瓷。适当的Fe/Co掺杂（x= 0.010和0.015）不仅可以优化KNNFC陶瓷的室温铁电性，而且可以有效地引入室温铁磁性和大磁介电效应。Fe2+/3+-O-Co2+/3+铁磁双交换被认为是铁磁增强的主要原因。此外，在铁电菱形-正交态（R-O）多晶相变附近发现了磁异常和明显的磁介电（MD）峰，表明这些样品中存在自旋晶格耦合。同时，在R-O相变温度附近开始出现的Fe2+-Fe3+、Co2+-Co3+和/或Fe2+/3+-Co2+/3+局部偶极子也有助于MD效应。当x= 0.015时，MD峰值高达+12% (0.9 T, 106Hz, 120 K)，室温MD值达到- 7% （0.9 T, 106Hz）。
Polycrystalline ceramics of (K0.52Na0.48)Nb1-x(FeCo)xO3(0 ≤x≤ 0.02) are synthesized using solid-state reaction method. Appropriate Fe/Co doping (x= 0.010 and 0.015) not only optimizes room temperature ferroelectricity of KNNFC ceramics, but also effectively introduces room temperature ferromagnetism and large magnetodielectric effects. The Fe2+/3+-O-Co2+/3+ferromagnetic double exchange is considered the main reason for the enhancement in ferromagnetic. Moreover, magnetic anomalies and noticeable magnetodielectric (MD) peaks are found near the ferroelectric rhombohedral-orthorhombic (R–O) polymorphic phase transition, indicating the presence of spin-lattice coupling in these samples. Meanwhile, the Fe2+-Fe3+, Co2+-Co3+, and/or Fe2+/3+-Co2+/3+local dipoles that begin to appear near the R–O phase transition temperature can also contribute to the MD effect. Whenx= 0.015, the MD peak is as large as +12% (0.9 T, 106Hz, 120 K), and the room temperature MD value reaches −7% (0.9 T, 106Hz).
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