On entropy change measurements around first order phase transitions in caloric materials
On entropy change measurements around first order phase transitions in caloric materials
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DOI：
10.1088/1361-648x/aa50d1
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
L. Caron;Nguyen Ba Doan;L. Ranno
中科院分区：
文献类型：
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作者：
L. Caron;Nguyen Ba Doan;L. Ranno
在这项工作中，我们讨论了间接测定与热材料中一级相变相关的等温熵变的测量协议。铜掺杂 MnAs 和 FeRh 中产生巨磁热效应的磁结构相变被用作案例研究，以举例说明设计不当的协议可能如何影响等温测量并导致错误的熵变估计。提出了等温测量协议，可以正确评估正向和逆向情况下一阶相变周围的熵变。
In this work we discuss the measurement protocols for indirect determination of the isothermal entropy change associated with first order phase transitions in caloric materials. The magneto-structural phase transitions giving rise to giant magnetocaloric effects in Cu-doped MnAs and FeRh are used as case studies to exemplify how badly designed protocols may affect isothermal measurements and lead to incorrect entropy change estimations. Isothermal measurement protocols which allow correct assessment of the entropy change around first order phase transitions in both direct and inverse cases are presented.