Phase relationships of the Co-Mn-In system at 673 K and the crystal structure and magnetic properties of the novel Co42Mn34In24 compound
Phase relationships of the Co-Mn-In system at 673 K and the crystal structure and magnetic properties of the novel Co42Mn34In24 compound
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673 K 时 Co-Mn-In 体系的相关系以及新型 Co42Mn34In24 化合物的晶体结构和磁性能
DOI：
10.1007/s10853-021-05866-6
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发表时间：
2021
影响因子：
4.5
通讯作者：
Zeng Weijing
中科院分区：
文献类型：
--
作者：
Yang Tonghan;Chen Guojian;He Wei;Liao Changzhong;Zeng Weijing
用X射线衍射仪、扫描电子显微镜和能谱技术研究了Co-Mn-In三元系在673K时的相关系。等温段由9个单相区、16个两相区和8个三相区组成。在673K下发现了一种新化合物Co50-x-yMn25+xIn25+y，其均匀度范围为X= 7-25(32-50at.%Mn)andy= −5-1(20-26at.%In)，并用常规和同步X射线粉末衍射技术和透射电子显微镜研究了它的晶体结构。该化合物为立方NiTi2型结构，空间群为Fd3m，典型的Co42Mn34In24的晶胞参数为Isa= 11.2405(2)？M-T和M-H的测量表明，该化合物具有复杂的磁性，表明铁磁和反铁磁相互作用共存。磁热万能曲线和阿罗特曲线表现出二级相变的特征。用改进的Arrott图技术、Kouvel-Fisher方法和临界等温方法研究了该材料的临界行为，表明该材料中存在长程相互作用。
The phase relationships of the Co–Mn–In ternary system at 673 K were investigated by X-ray diffraction, scanning electron microscopy and energy dispersion spectroscopy techniques in this study. The isothermal section consists of 9 single-phase regions, 16 two-phase regions and 8 three-phase regions. A new compound Co50-x-yMn25+xIn25+ywas found at 673 K with a homogeneity range ofx= 7–25 (32—50 at.% Mn) andy= −5–1 (20–26 at.% In), and its crystal structure was investigated by conventional and synchrotron X-ray powder diffraction techniques and transmission electron microscopy. The compound crystallized in a cubic NiTi2-type structure with space group Fd3m and the lattice parameter isa= 11.2405(2) Å for the typical composition of Co42Mn34In24. The measurements of M–T and M–H show that the novel compound has complex magnetic properties, which indicates coexistence of ferromagnetic and antiferromagnetic interactions. Magnetocaloric universal curves and Arrott curves show a characteristic of second-order transition. Critical behavior was investigated by modified Arrott plots technique, Kouvel–Fisher method and critical isothermal, which suggested that long-range interaction exists in this novel material.