Journal
APPLIED PHYSICS LETTERS
Volume 111, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5001366
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Funding
- National Science Foundation of China (NSFC) [51372195, 51772238, 41372055, 51502346, 51372018]
- CSS [YK2015-0602006]
- One Thousand Youth Talents program
- U.S. National Science Foundation [DMR-1410322]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1410322] Funding Source: National Science Foundation
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We report a large electrocaloric efficiency of 0.029K cm kV(-1) at 303K and in a wide operating temperature range of 293K to 313K in a lead-free Ba0.9Sr0.1(Ti0.9Zr0.1)(0.95)Sn0.05O3 ceramic by using direct electrocaloric effect (ECE) measurements. Sn(4+)doping in Ba0.9Sr0.1Ti0.9Zr0.1O3 not only tunes the rhombohedral-to-paraelectric phase transition temperature to room temperature but also slightly widens the phase transition region, by slightly strengthening the diffuse character and maintaining its good ferroelectricity. Also, polar nanoregions embedded in the matrix facilitate polarization rotation because of a flat energy landscape associated with the relaxor-to-ferroelectric phase transition, inducing enhanced entropy changes and consequently excellent ECE performance. Published by AIP Publishing.
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