Conventional and inverse barocaloric effects around triple points in ferroelastics (NH4)3NbOF6 and (NH4)3TiOF5

SCRIPTA MATERIALIA

卷:139

Article

Gorev, M. V.^1,2  Bogdanov, E. V.^1,3  Flerov, I. N.^1,2 

[1] Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia

[2] Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660074, Russia

[3] Krasnoyarsk State Agrarian Univ, Inst Engn Syst & Energy, Krasnoyarsk 660049, Russia

关键词: Polymorphic phase transformation;    Phase diagram;    Order-disorder phenomena;    Entropy;    Barocaloric effect;   

DOI  :  10.1016/j.scriptamat.2017.06.022

来源: Elsevier

【 摘 要 】

We report the conventional and inverse barocaloric effect (BCE) in ferroelastics (NH4)(3)NbOF6 and (NH4)(3)TiOF5. We found a rich set of the structural phase transitions and triple points on the T - p phase diagrams. Extensive and intensive BCE near some transformations and around triple points in both crystals are outstanding (|Delta S-BCE(max)| = 30-100 J/kg.K; |Delta T-AD(max)| = 4-22 K) and can be achieved at low pressure 0.01-0.60 GPa. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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