Title :
0.92 Pb(Mg1/3Nb2/3)O3 — 0.08 PbTiO3 relaxor ferroelectrics modified with different dopants for electrocaloric cooling application
Author :
Molin, C. ; Keitel, U. ; Neumeister, P. ; Gebhardt, S. ; Schonecker, A.
Author_Institution :
Fraunhofer Inst. for Ceramic Technol. & Syst., Dresden, Germany
Abstract :
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.
Keywords :
bismuth; chromium; cobalt; copper; doping profiles; europium; ferroelectric ceramics; lanthanum; lead compounds; lithium; manganese; neodymium; potassium; pyroelectricity; relaxor ferroelectrics; strontium; tantalum; yttrium; (PMN-PbTiO3):Bi; (PMN-PbTiO3):Co; (PMN-PbTiO3):Cr; (PMN-PbTiO3):Cu; (PMN-PbTiO3):Eu; (PMN-PbTiO3):K; (PMN-PbTiO3):La; (PMN-PbTiO3):Li; (PMN-PbTiO3):Mn; (PMN-PbTiO3):Nd; (PMN-PbTiO3):Sr; (PMN-PbTiO3):Ta; (PMN-PbTiO3):Y; bulk ceramics; columbite route; dopants; electric field withdrawal; electrocaloric cooling application; relaxor ferroelectrics; temperature change; Cooling; Dielectrics; Electric fields; Electric variables measurement; Permittivity; Temperature; Temperature measurement; PMN-PT; dielectric properties; electrocaloric effect; electrocaloric material; relaxor ferroelectrics;
Conference_Titel :
Applications of Ferroelectrics, International Workshop on Acoustic Transduction Materials and Devices & Workshop on Piezoresponse Force Microscopy (ISAF/IWATMD/PFM), 2014 Joint IEEE International Symposium on the
Conference_Location :
State College, PA
DOI :
10.1109/ISAF.2014.6922997
