Adiabatic temperature change around coinciding first and second order magnetic transitions in Mn3Ga(C0.85N0.15)
Adiabatic temperature change around coinciding first and second order magnetic transitions in Mn3Ga(C0.85N0.15)
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DOI：
10.1016/j.jmmm.2013.05.057
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发表时间：
2013-10
影响因子：
2.7
通讯作者：
O. Cakir;M. Acet
中科院分区：
文献类型：
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作者：
O. Cakir;M. Acet
Mn3GaC中的逆磁热学材料依赖于在160℃左右存在一级反铁磁-铁磁转变。由于Mn3GaN是反铁磁性的，所以Mn3GaC中的碳被氮部分取代增强了反铁磁交换，并使这种转变向更高的温度移动。在Mn3Ga(C0.85N0.15)化学计量比下，转变发生在180℃，转变处的磁滞减小，因此逆磁热效应实际上是可逆的。我们用磁化和直接温变测量研究了磁热效应和绝热温变的可逆性。
The inverse magnetocaloric material in Mn3GaC relies on the presence of a first order antiferromagnetic–ferromagnetic transition at around 160 K. Since Mn3GaN is antiferromagnetic, the partial substitution of carbon by nitrogen in Mn3GaC enhances the antiferromagnetic exchange and shifts this transition to higher temperatures. At the Mn3Ga(C0.85N0.15) stoichiometry, the transition takes place at 180 K. The hysteresis at the transition reduces so that the inverse magnetocaloric effect is practically reversible. We study the magnetocaloric effect and the reversibility of the adiabatic temperature-change by magnetization and direct temperature-change measurements up to field-changes of 5 T.