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0.92 Pb(Mg1/3Nb2/3)O3 - 0.08 PbTiO3 relaxor ferroelectrics modified with different dopants for electrocaloric cooling application

: Molin, Christian; Keitel, Uwe; Neumeister, Peter; Gebhardt, Sylvia; Schönecker, Andreas


Institute of Electrical and Electronics Engineers -IEEE-:
Joint IEEE International Symposium on the Applications of Ferroelectrics, International Workshop on Acoustic Transduction Materials and Devices & Workshop on Piezoresponse Force Microscopy, ISAF/IWATMD/PFM 2014 : 12-16 May 2014, State College, PA
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-3860-5
International Symposium on the Applications of Ferroelectrics (ISAF) <2014, State College/Pa.>
International Workshop on Acoustic Transduction Materials and Devices (IWATMD) <2014, State College/Pa.>
Workshop on Piezoresponse Force Microscopy (PFM) <2014, State College/Pa.>
Conference Paper
Fraunhofer IKTS ()
dielectric properties; electrocaloric effect; electrocaloric material; PMN-PT; relaxor ferroelectrics

In the present work we investigate the influence of acceptor (K+, Cu+, Li+), donor (La3+, Bi3+, Eu3+, Nd3+, Y3+, Cr3+) and charge equivalent dopants (Sr2+, Co2+, Mn2+, Ta5+) on the dielectric and ferroelectric behavior of 0.92 Pb(Mg1/3Nb2/3)O3-0.08 PbTiO3(0.92PMN-0.08PT). As a criterion for the basic suitability for electrocaloric cooling application, we directly measure the temperature change (ΔT) upon the application and withdrawal of an electric field as a function of the ambient temperature. For the undoped 0.92PMN-0.08PT bulk ceramics fabricated by the columbite route, we observed the maximum ΔT of 0.24 K when applying an electric field of 2 kv-rnm-1 at 28°C (ΔTup). Withdrawing the electric field at same conditions showed a temperature decrease of 0.20 K (ΔTdown). The resulting ΔTdown:ΔTup ratio is also considered.