Fe and Co selective substitution in Ni2MnGa: Effect of magnetism on relative phase stability
Fe and Co selective substitution in Ni2MnGa: Effect of magnetism on relative phase stability
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DOI：
10.1080/14786431003745393
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发表时间：
2010-01-01
影响因子：
1.6
通讯作者：
Rios-Jara, D.
中科院分区：
文献类型：
--
作者：
Soto-Parra, D. E.;Moya, X.;Rios-Jara, D.
研究了Fe和Co 3d元素的选择性替代对原型磁性形状记忆合金Ni-Mn-Ga的结构相变和磁相变的影响。我们确定的相图为每个元素的掺杂取代量热法和交流磁化率测量的装置。尝试用相同的掺杂量来代替每种组成元素，并研究除电子浓度以外的参数在控制相稳定性中的作用。具体而言，选择性掺杂原子的原子半径相似，但不同的磁性能，使我们能够调查的三元化合物的相对相稳定性的磁相互作用的作用。我们确定的熵变与马氏体相变为每个四元合金，以获得进一步的信息，磁性对所涉及的相表现出这些化合物的相对稳定性的影响。
We studied the effect of selective substitution in Fe and Co 3d elements on the structural and magnetic phase transitions in the prototypical magnetic shape memory alloy Ni-Mn-Ga. We determined the phase diagram for each elemental doping substitution by means of calorimetry and ac susceptibility measurements. An effort was made to substitute each constituent element by the same amounts of doping and to study the role of parameters other than electronic concentration in controlling phase stability. Specifically, selective doping with atoms of similar atomic radii but different magnetic properties allowed us to investigate the role of magnetic interactions on the relative phase stability of the ternary compound. We determined the entropy change associated with the martensitic transition for each quaternary alloy to obtain further information on the effect of magnetism on the relative stability of the involved phases exhibited by these compounds.