论文部分内容阅读
研究了MnNiGe1-xGax(x=0—0.30)系列合金中成分、结构、马氏体相变性质和磁性的相互关系.在较小的成分范围内,Ga取代Ge元素可有效地将马氏体相变温度降低近400 K.Ga的引入削弱了体系中的共价成键作用,马氏体相显示出磁交换作用的增强.相图显示,掺杂使马氏体相变先后穿过TN和TC两个磁有序温度,居里温度窗口效应在体系有存在的可能,磁性对相变温度的成分关系有所影响.实验观察到合金变磁转变的特性及相变行为对制备方法的敏感性.这些特性的发现,有利于进一步优化这类材料的磁结构和相变特性,获得具有应用价值的新材料.
The relationship between the composition, structure, martensitic transformation properties and magnetic properties of MnNiGe1-xGax (x = 0-0.30) alloys has been investigated. In the smaller composition range, The phase transition temperature is reduced by nearly 400 K. The introduction ofGaGa impairs the covalent bonding in the system, and the martensitic phase shows the enhancement of magnetic exchange.The phase diagram shows that the doping causes the martensite transformation to pass through the TN And TC two magnetic ordering temperature, the Curie temperature window effect exists in the system may exist, the magnetic phase transition temperature has an influence on the composition of the relationship between the experimental changes in alloy magnetization and phase transition behavior of the preparation method The discovery of these characteristics will help to further optimize the magnetic structure and phase transition characteristics of these materials to obtain new materials with application value.