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Direct measurement of electrocaloric effect in lead-free Ba(SnxTi1-x)O3 ceramics

Applied physics letters, 2017-10, Vol.111 (17) [Peer Reviewed Journal]

Author(s) ;2017 Author(s). Published by AIP Publishing. ;ISSN: 0003-6951 ;EISSN: 1077-3118 ;DOI: 10.1063/1.5001196 ;CODEN: APPLAB

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  • Title:
    Direct measurement of electrocaloric effect in lead-free Ba(SnxTi1-x)O3 ceramics
  • Author: Sanlialp, Mehmet ; Luo, Zhengdong ; Shvartsman, Vladimir V. ; Wei, Xianzhu ; Liu, Yang ; Dkhil, Brahim ; Lupascu, Doru C.
  • Subjects: Ceramics ; Composition effects ; Differential scanning calorimetry ; Ferroelectric materials ; Ferroelectricity ; Lead free ; Multiphase ; Relaxors
  • Is Part Of: Applied physics letters, 2017-10, Vol.111 (17)
  • Description: In this study, we report on investigation of the electrocaloric (EC) effect in lead-free Ba(SnxTi1-x)O3 (BSnT) ceramics with compositions in the range of 0.08 ≤ x ≤ 0.15 by the direct measurement method using a differential scanning calorimeter. The maximum EC temperature change, ΔT EC-max = 0.63 K under an electric field of 2 kV/mm, was observed for the composition with x = 0.11 at ∼44 °C around the multiphase coexistence region. We observed that the EC effect also peaks at transitions between ferroelectric phases of different symmetries. Comparison with the results of indirect EC measurements from our previous work shows that the indirect approach provides reasonable estimations of the magnitude of the largest EC temperature changes and EC strength. However, it fails to describe correctly temperature dependences of the EC effect for the compositions showing relaxor-like behaviour (x = 0.14 and 0.15) because of their non-ergodic nature. Our study provides strong evidence supporting that looking for multiphase ferroelectric materials can be very useful to optimize EC performance.
  • Publisher: Melville: American Institute of Physics
  • Language: English
  • Identifier: ISSN: 0003-6951
    EISSN: 1077-3118
    DOI: 10.1063/1.5001196
    CODEN: APPLAB
  • Source: Alma/SFX Local Collection
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