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Title: Lead-free Ba{sub 0.8}Ca{sub 0.2}(Zr{sub x}Ti{sub 1−x})O{sub 3} ceramics with large electrocaloric effect

The electrocaloric effect was investigated in lead-free Zr doped Ba{sub 0.8}Ca{sub 0.2}(Zr{sub x}Ti{sub 1−x})O{sub 3} (BCTZ) ceramics synthesized by a conventional sintering process. Room-temperature x-ray diffraction analysis showed that the tetragonal structure is obtained in BCTZ for x ≤ 0.08 and a pseudo cubic phase for x > 0.08. The dielectric spectroscopy and calorimetry revealed that the Curie temperature decreases as a consequence of Zr doping and that the BCTZ exhibits a first order ferroelectric phase transition. The electrocaloric effect was determined by the calculation of the electrocaloric change of temperature (ΔT) using the Maxwell relation based on the P–E hysteresis loops measured at different temperatures. A large electrocaloric responsivity ΔT/ΔE = 0.34 × 10{sup −6 }Km/V was found for x = 0.04, which significantly exceeds of values found so far in other lead-free electrocaloric materials.
Authors:
 [1] ;  [2] ; ; ; ;  [1] ; ;  [3] ; ;  [4] ;  [5]
  1. LPMC, Université de Picardie Jules Verne, 33 rue Saint-Leu, 80039 Amiens Cédex (France)
  2. (Morocco)
  3. LRCS, UMR7314, Université de Picardie Jules Verne, 33 rue Saint-Leu, 80039 Amiens Cédex (France)
  4. LMCN, F.S.T.G. Université Cadi Ayyad, BP 549 Marrakech (Morocco)
  5. Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana (Slovenia)
Publication Date:
OSTI Identifier:
22415200
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM COMPOUNDS; CALCIUM OXIDES; CERAMICS; DOPED MATERIALS; FERROELECTRIC MATERIALS; HYSTERESIS; PHASE TRANSFORMATIONS; SINTERING; TEMPERATURE RANGE 0273-0400 K; THERMOELECTRIC PROPERTIES; TITANIUM; X-RAY DIFFRACTION; ZIRCONIUM