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On entropy change measurements around first order phase transitions in caloric materials

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Caron,  Luana
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Caron, L., Nguyen Doan, B., & Ranno, L. (2017). On entropy change measurements around first order phase transitions in caloric materials. Journal of Physics: Condensed Matter, 29(7): 075401, pp. 1-7. doi:10.1088/1361-648X/aa50d1.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-5602-4
Abstract
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 magnetostructural 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.