Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 18, Pages 16300-16305Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.08.217
Keywords
PMN-24PT; Orientation; Dielectric spectrum; Electrocaloric
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Funding
- National Natural Science Foundation of China [11574057, 51604087]
- Guangdong Provincial Natural Science Foundation of China [2016A030313718]
- Science and Technology Program of Guangdong Province of China [2016A010104018, 2017A0104022]
- Youth Foundation of Guangdong University of Technology [14QNZA004]
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Orientation related phase transitions of 0.76Pb(Mg1/3NB2/3)O-3-0.24PbTiO(3) single crystals are studied. Values of the relaxation parameters (gamma = 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)O-3-0.24PbTiO(3) single crystals are first studied and reported, large reversible adiabatic temperature change (0.80 K) and isothermal entropy change (0.66 J kg(-1)) are observed. Giant refrigeration efficiency (43.52) and high electrocaloric coefficient (0.041 K cm kV(-1)) exceed the electrocaloric effect values in most bulk ferroelectrics in previous reports.
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