PST thin films for electrocaloric coolers
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Correia, T. M.
Kar-Narayan, S.
Young, J. S.
Scott, J. F.
Mathur, N. D.
Whatmore, Roger W.
Zhang, Qi
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0022-3727
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T M Correia, S Kar-Narayan, J S Young, J F Scott, N D Mathur, R W Whatmore and Q Zhang, PST thin films for electrocaloric coolers, Journal of Physics D: Applied Physics, Volume 44, Number 16, 2011, Paper Number: 165407
Abstract
Relaxor behaviour in a thin film of partially ordered PbSc0.5Ta0.5O3 (PST) was confirmed via slim P-E loops and the frequency dependence of the temperature at which the dielectric constant is maximum. Indirect measurements of the electrocaloric effect suggest that removing a field of 774 kV cm-1 yields a temperature change of -3.5 °C to -6.9 °C over a broad range of operating temperatures near room temperature (1-127 °C), with a correspondingly large refrigerant capacity of 662 J kg-1. In addition to low electrical hysteresis, there is negligible thermal hysteresis. PST thin films are therefore promising for EC cooling near room temperatu