Enhanced cooling capacities of ferroelectric materials at morphotropic phase boundaries

Enhanced cooling capacities of ferroelectric materials at morphotropic phase boundaries

The electrocaloric properties of PbZr0.52Ti0.48O3(PZT) epitaxial films and 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (0.7PMN-0.3PT) single crystals are measured and demonstrated enhanced low temperature refrigeration at morphotropic phase boundary compositions. The results reveal large adiabatic cooling figures...

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Bibliographic Details
Main Authors: Chukka, Rami, Cheah, Jun Wei, Chen, Zuhuang, Yang, P., Shannigrahi, S., Wang, Junling, Chen, Lang
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2014
Subjects:
DRNTU::Engineering::Materials
Online Access:https://hdl.handle.net/10356/105798
http://hdl.handle.net/10220/20913
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Institution: Nanyang Technological University
Language: English
Description
Summary:The electrocaloric properties of PbZr0.52Ti0.48O3(PZT) epitaxial films and 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (0.7PMN-0.3PT) single crystals are measured and demonstrated enhanced low temperature refrigeration at morphotropic phase boundary compositions. The results reveal large adiabatic cooling figures in ~260nm PZT films (11 K in 15 V) and 200μm thick 0.7PMN-0.3PT single crystals (2.7 K in 240 V) at Curie transition temperatures and secondary cooling peaks at lower temperatures, near critical points. This is a very useful aspect of ferroelectric cooling elements to attain effective cooling over wide range of working temperatures in solid-state devices.

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