Large electrocaloric effects in single-crystal ammonium sulfate | Zendy

Sam Crossley | Zendy; Wei Li | Zendy; Xavier Moya | Zendy; N. D. Mathur | Zendy

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Large electrocaloric effects in single-crystal ammonium sulfate

Author(s) -

Sam Crossley,

Wei Li,

Xavier Moya,

N. D. Mathur

Publication year - 2016

Publication title -

philosophical transactions of the royal society a mathematical physical and engineering sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.074

H-Index - 169

eISSN - 1471-2962

pISSN - 1364-503X

DOI - 10.1098/rsta.2015.0313

Subject(s) - materials science , single crystal , ammonium sulfate , electrocaloric effect , sulfate , crystallography , chemistry , optoelectronics , metallurgy , ferroelectricity , dielectric

Electrocaloric (EC) effects are typically studied near phase transitions in ceramic and polymer materials. Here, we investigate EC effects in an inorganic salt, namely ammonium sulfate (NH4)2SO4, with an order-disorder transition whose onset occurs at 223 K on cooling. For a single crystal thinned to 50 μm, we use a Maxwell relation to find a large isothermal entropy change of 30 J K(-1) kg(-1) in response to a field change of 400 kV cm(-1) The Clausius-Clapeyron equation implies a corresponding adiabatic temperature change of 4.5 K.This article is part of the themed issue 'Taking the temperature of phase transitions in cool materials'.

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