Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5437261 | Ceramics International | 2017 | 6 Pages |
Abstract
Orientation related phase transitions of 0.76Pb(Mg1/3Nb2/3)O3-0.24PbTiO3 single crystals are studied. Values of the relaxation parameters (γ = 1.87-1.97) estimated from linear fits of the modified Curie-Weiss law indicate the relaxor nature. For (110) oriented single crystal, typical oxygen vacancies related high temperature dielectric relaxation behaviors are observed and analyzed. Orientations dependent electrocaloric effects of 0.76Pb(Mg1/3Nb2/3)O3-0.24PbTiO3 single crystals are first studied and reported, large reversible adiabatic temperature change (0.80 K) and isothermal entropy change (0.66 J Kâ1 kgâ1) are observed. Giant refrigeration efficiency (43.52) and high electrocaloric coefficient (0.041 K cm kVâ1) exceed the electrocaloric effect values in most bulk ferroelectrics in previous reports.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Tian-Fu Zhang, Xin-Gui Tang, Peng-Zu Ge, Qiu-Xiang Liu, Yan-Ping Jiang,