TY - JOUR
T1 - Giant electrocaloric response over a broad temperature range in modified BaTiO3 Ceramics
AU - Qian, Xiao Shi
AU - Ye, Hui Jian
AU - Zhang, Ying Tang
AU - Gu, Haiming
AU - Li, Xinyu
AU - Randall, C. A.
AU - Zhang, Q. M.
PY - 2014/3/5
Y1 - 2014/3/5
N2 - A giant electrocaloric effect (ECE) near room temperature is reported in a lead-free bulk inorganic material. By tuning Ba(ZrxTi 1-x)O3 compositions which also exhibit relaxor ferroelectric response to near the invariant critical point, the Ba(Zr xTi1-x)O3 bulk ceramics at x ∼ 0.2 exhibit a large adiabatic temperature drop of 4.5 K, a large isothermal entropy change of 8 J kg-1 K-1, and a large EC coefficient (|ΔTc/ΔE| = 0.52 × 10-6 KmV-1 and ΔS/ΔE = 0.93 × 10-6 J m kg-1 K -1 V-1) over a 30 K temperature range. These properties added together indicate a general solution of the electrocaloric materials with high performance for practical cooling applications. A giant electrocaloric effect (ECE), i.e., a large adiabatic temperature drop (ΔTc) with a high electrocaloric coefficient (ΔTc/ΔE), is demonstrated in a modified lead-free ferroelectric ceramic, BaTiO3, over a broad temperature range near the invariant critical point (ICP). Multiphase coexistence near ICP provides a larger entropy change compared with that of a pure ferroelectric-paraelectric transition. When coupled with the relaxor behavior, this leads to the observed giant ECE in BZT (x = 0.2) over a broad temperature range
AB - A giant electrocaloric effect (ECE) near room temperature is reported in a lead-free bulk inorganic material. By tuning Ba(ZrxTi 1-x)O3 compositions which also exhibit relaxor ferroelectric response to near the invariant critical point, the Ba(Zr xTi1-x)O3 bulk ceramics at x ∼ 0.2 exhibit a large adiabatic temperature drop of 4.5 K, a large isothermal entropy change of 8 J kg-1 K-1, and a large EC coefficient (|ΔTc/ΔE| = 0.52 × 10-6 KmV-1 and ΔS/ΔE = 0.93 × 10-6 J m kg-1 K -1 V-1) over a 30 K temperature range. These properties added together indicate a general solution of the electrocaloric materials with high performance for practical cooling applications. A giant electrocaloric effect (ECE), i.e., a large adiabatic temperature drop (ΔTc) with a high electrocaloric coefficient (ΔTc/ΔE), is demonstrated in a modified lead-free ferroelectric ceramic, BaTiO3, over a broad temperature range near the invariant critical point (ICP). Multiphase coexistence near ICP provides a larger entropy change compared with that of a pure ferroelectric-paraelectric transition. When coupled with the relaxor behavior, this leads to the observed giant ECE in BZT (x = 0.2) over a broad temperature range
UR - http://www.scopus.com/inward/record.url?scp=84897647206&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84897647206&partnerID=8YFLogxK
U2 - 10.1002/adfm.201302386
DO - 10.1002/adfm.201302386
M3 - Article
AN - SCOPUS:84897647206
VL - 24
SP - 1300
EP - 1305
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
IS - 9
ER -