On entropy change measurements around first order phase transitions in caloric materials. (23rd December 2016)

• Record Type: Journal Article
• Authors: Caron, Luana; Ba Doan, Nguyen; Ranno, Laurent
• Is Part Of: Journal of physics. Volume 29:Number 7(2017)
• Publication Date: 2016-12-23
• Subjects: magnetocaloric effect -- entropy change -- Maxwell relations; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aa50d1
• Languages: English
• ISSNs: 0953-8984

Abstract

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 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.