Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 25, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4938134
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Funding
- National Science Foundation of China (NSFC) [51372195, 41372055]
- Ministry of Science and Technology of China through a 973-Project [2012CB619401]
- Fundamental Research Funds for Central Universities [2013JDGZ03]
- CSS project [YK2015-0602006]
- One Thousand Youth Talents program
- Education Program for Talented Students of Xi'an Jiaotong University
- China Scholarship Council (CSC)
- [IRT13034]
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Electrocaloric effect in lead-free Ba0.94Ca0.06Ti1-xSnxO3 ceramics is studied using an indirect method. The Ba(0.94)Ca(0.06)Ti(0.87)5Sn(0.125)O(3) ceramic located near a multi-phase point shows best electrocaloric performance, which provides further experimental evidence for optimizing electrocaloric properties through constructing multiphase coexistence. Giant electrocaloric efficiency (similar to 0.4K mm/kV) is achieved in this ceramic at about room temperature at a low electric field of 6 kV/cm. While large electrocaloric temperature (similar to 0.63 K) is obtained by further enhancing electric field (20 kV/cm), a decrease in electrocaloric efficiency (0.32K mm/kV) is simultaneously observed, which is attributed to phase transition from first-order to more diffusive second-order under higher electric field. (C) 2015 AIP Publishing LLC.
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