INVESTIGATION OF ELECTRIC AND ELECTROCALORIC PROPERTIES FOR Sm-DOPED 71PMN-29PT CERAMICS
Sm-doped 0.71Pb(Mg1/3Nb2/3)O3-O.29PbTiO3 ceramics (denoted as xSm-71PMN-29PT,0 ≤ x ≤ 5 mol.%) were synthesized by sol-gel method.The effects of Sm-doping on the electrical and electrocaloric properties of the 71PMN-29PT were investigated.Among all samples prepared,3 Sm-71PMN-29PT displays the optimal piezoelectric and dielectric properties-piezoelectric coefficient d33 of 1040 pC/N,relative dielectric constant εr of 8078,electromechanical coupling factor kp of 0.60.With the increase of Sm doping amount,the dielectric-peak temperature Tm decreases from 405 K to 318 K.Moreover,the electrocaloric (EC) effect in the related ceramics was calculated via indirect method.Under the electric field of 40 kV/cm,the EC temperature change (AT) reach their maximal values when the testing temperature is near Tm.The largest electrocaloric response is found in 71PMN-29PT ceramic at T =428 K with AT =1.49 K,and the largest room temperature electrocaloric response is found in 5Sm-71PMN-29PT ceramic with AT =0.77 K.The excellent comprehensive electrical properties and room temperature electrocaloric performances make Sm-doped 71PMN-29PT ceramics to be one of the most promising candidates for solid-refrigerator applications.
Sm-doped PMN-PT ceramics dielectric electrocaloric
Peng CHEN Ying YANG Tingrui HE Yiping WANG
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aerona State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aerona
国际会议
石家庄
英文
242-246
2019-11-01（万方平台首次上网日期，不代表论文的发表时间）