Comparative analysis of elastocaloric and barocaloric effects in single-crystal and ceramic ferroelectric (NH4)2SO4

We report the influence of anisotropy and texture on elasto(ElCE)- and baro(BCE)-caloric effects in single-crystal and ceramic (NH4)2SO4. Inverse extensive and intensive ElCE in ceramics, (ΔSElCE)cer = 87 J/kg·K; ΔTAD = - 11.6 K), as well as in a single crystal along the ferroelectric axis a, (ΔSElC...

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Bibliographic Details
Published in:Scripta materialia 2021-01, Vol.191, p.149-154
Main Authors: Mikhaleva, Ekaterina, Gorev, Mikhail, Bondarev, Vitaly, Bogdanov, Evgeny, Flerov, Igor
Format: Article
Language:English
Subjects:
Caloric effects
Entropy
Order–disorder phenomena
Phase diagram
Polymorphic phase transformation
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Summary:We report the influence of anisotropy and texture on elasto(ElCE)- and baro(BCE)-caloric effects in single-crystal and ceramic (NH4)2SO4. Inverse extensive and intensive ElCE in ceramics, (ΔSElCE)cer = 87 J/kg·K; ΔTAD = - 11.6 K), as well as in a single crystal along the ferroelectric axis a, (ΔSElCE)a = 115 J/kg·K; (ΔTAD)a = - 16 K, significantly exceed BCE, ΔSBCE = 75 J/kg·K; ΔTAD = - 9.8 K, even at low pressure ~ 0.3 GPa. Caloric parameters of ammonium sulphate are comparable with those for promising solid-state refrigerants. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2020.09.030