通过建立居里温度窗口研究等结构MnNiGe-CoNiGe体系的巨磁热效应
Giant magnetocaloric effect in isostructural MnNiGe-CoNiGe system by establishing a Curie-temperature window
摘要：
采用一种有效的等构合金化方案，在MnNiGe-CoNiGe系中建立了一个居里温度窗口。随着相变温度的降低和反铁磁马氏体向铁磁态转变的同时完成，在奥氏体和马氏体相的居里温度之间建立了一个200 K的居里温度窗口。在该窗口中，顺磁性奥氏体和铁磁性马氏体之间的一级磁结构转变发生，磁化强度急剧跳变，在50 kOe的磁场变化下显示出高达-40 J kg-1 K-1的磁熵变。这种巨磁热效应使Mn 1-xCoxNiGe成为一种潜在的磁制冷剂。
英文摘要：
An effective scheme of isostructural alloying was applied to establish a Curie-temperature window in isostructural MnNiGe-CoNiGe system. With the simultaneous accomplishment of decreasing structural-transition temperature and converting antiferromagnetic martensite to ferromagnetic state, a 200 K Curie-temperature window was established between Curie temperatures of austenite and martensite phases. In the window, a first-order magnetostructural transition between paramagnetic austenite and ferromagnetic martensite occurs with a sharp jump in magnetization, showing a magnetic entropy change as large as -40 J kg-1 K-1 in a 50 kOe field change. This giant magnetocaloric effect enables Mn1-xCoxNiGe to become a potential magnetic refrigerant.
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