Composition-induced non-ergodic–ergodic transition and electrocaloric evolution in Pb1−1.5xLaxZr0.8Ti0.2O3 relaxor ferroelectric ceramics - Details

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Abstract：

Relaxor　ferroelectrics,　with　polar　nanoregions　(PNRs),　are　good　candidates　for　electrocaloric　(EC)　refrigeration.　This　study　investigates　the　EC　performance　of　the　Pb1−1.5xLaxZr0.8Ti0.2O3　relaxor　ferroelectric　ceramics　by　the　direct　measurement　using　a　modified　differential　scanning　calorimeter.　All　the　ceramics　exhibit　pure　perovskite　phase　with　a　dense　microstructure.　The　results　indicate　that　the　increasing　La　substitution　strengthens　the　relaxor　behaviour,　promotes　the　transition　from　non-ergodic　to　ergodic　state,　and　enhances　the　thermal　stability　of　EC　property　(instability　η　max　=　0.98　K　(@140°C)　for　x　=　0.06　to　ΔTmax　=　0.25　K　(@40°C)　for　x　=　0.09　under　an　electric　field　of　40　kV/cm.　Moreover,　the　ceramics　with　x　=　0.07,　near　the　non-ergodic–ergodic　state　boundary,　show　the　optimised　room　temperature　EC　performance,　i.e.　ΔT　=　0.41　K　(@20°C)　and　η　©　2019　Institution　of　Engineering　and　Technology.　All　rights　reserved.

Keyword：

Ferroelectric materials Refrigeration Perovskite Ferroelectricity Differential scanning calorimetry Electric fields Thermodynamic stability Ferroelectric ceramics

Author Community：

[ 1 ] [Li, Junjie]Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing; 100083, China
[ 2 ] [Li, Junjie]Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing; 100083, China
[ 3 ] [Yin, Ruowei]Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing; 100083, China
[ 4 ] [Yin, Ruowei]Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing; 100083, China
[ 5 ] [Su, Xiaopo]Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing; 100083, China
[ 6 ] [Su, Xiaopo]Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing; 100083, China
[ 7 ] [Li, Jianting]Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing; 100083, China
[ 8 ] [Li, Jianting]Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing; 100083, China
[ 9 ] [Qin, Shiqiang]Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing; 100083, China
[ 10 ] [Qin, Shiqiang]Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing; 100083, China
[ 11 ] [Wei, Qiumei]College of Materials Science and Engineering, Beijing University of Technology, Beijing; 100124, China
[ 12 ] [Zhu, Mankang]College of Materials Science and Engineering, Beijing University of Technology, Beijing; 100124, China
[ 13 ] [Guo, Dong]School of Materials Science and Engineering, Beihang University, Beijing; 100191, China
[ 14 ] [Qiao, Lijie]Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing; 100083, China
[ 15 ] [Qiao, Lijie]Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing; 100083, China
[ 16 ] [Bai, Yang]Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing; 100083, China
[ 17 ] [Bai, Yang]Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing; 100083, China

Reprint Author's Address：

[bai, yang]institute for advanced materials and technology, university of science and technology beijing, beijing; 100083, china;;[bai, yang]beijing advanced innovation center for materials genome engineering, university of science and technology beijing, beijing; 100083, china

Email：

baiy@mater.ustb.edu.cn

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