高熵尖晶石氧化物Mn 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 fe2o的多方法表征:熵证据、微观结构和磁性能

IF 6.1 Q1 CHEMISTRY, MULTIDISCIPLINARY
Svenja Senkale, Dr. Marius Kamp, Dr. Stefan Mangold, Dr. Sylvio Indris, Prof. Dr. Lorenz Kienle, Dr. Reinhard K. Kremer, Prof. Dr. Wolfgang Bensch
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引用次数: 0

摘要

采用溶液燃烧法和不同的热处理方法,成功制备了含有6个过渡金属阳离子的新型尖晶石Cu0.2Co0.2Mn0.2Ni0.2Zn0.2Fe2O4。利用原位高温粉末x射线衍射(PXRD)和部分组成元素的定向去除,证明了这种六金属材料的熵稳定性。对PXRD数据的全面评估得出了纳米范围内相干散射域的大小。基于透射电子显微镜的方法支持这一发现,并表明样品中的元素分布均匀。结合57Fe Mössbauer光谱和x射线吸收近边光谱可以测定立方尖晶石结构中四面体和八面体位置上的阳离子占比。磁学研究表明,在低温下具有极高的饱和磁化强度,在92-108 emu g−1范围内具有铁磁性或铁磁性的远程磁交换相互作用,但在500°C煅烧的样品中也存在异常的磁滞。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Multi-Method Characterization of the High-Entropy Spinel Oxide Mn0.2Co0.2Ni0.2Cu0.2Zn0.2Fe2O4: Entropy Evidence, Microstructure, and Magnetic Properties

Multi-Method Characterization of the High-Entropy Spinel Oxide Mn0.2Co0.2Ni0.2Cu0.2Zn0.2Fe2O4: Entropy Evidence, Microstructure, and Magnetic Properties

The novel spinel Cu0.2Co0.2Mn0.2Ni0.2Zn0.2Fe2O4 comprising six transition metal cations was successfully prepared by a solution-combustion method followed by distinct thermal treatments. The entropic stabilization of this hexa-metallic material is demonstrated using in situ high temperature powder X-ray diffraction (PXRD) and directed removal of some of the constituting elements. Thorough evaluation of the PXRD data yields sizes of coherently scattering domains in the nanometre-range. Transmission electron microscopy based methods support this finding and indicate a homogeneous distribution of the elements in the samples. The combination of 57Fe Mössbauer spectroscopy with X-ray absorption near edge spectroscopy allowed determination of the cation occupancy on the tetrahedral and octahedral sites in the cubic spinel structure. Magnetic studies show long-range magnetic exchange interactions which are of ferri- or ferromagnetic nature with an exceptionally high saturation magnetization in the range of 92–108 emu g−1 at low temperature, but also an anomaly in the hysteresis of a sample calcined at 500 °C.

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