Phase transition behavior and high electrostrictive strains in Bi(Li0.5Nb0.5)O-3-doped lead magnesium niobate-based solid solutions
Phase transition behavior and high electrostrictive strains in Bi(Li0.5Nb0.5)O-3-doped lead magnesium niobate-based solid solutions
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Bi(Li0.5Nb0.5)O-3掺杂铌酸镁铅基固溶体中的相变行为和高电致伸缩应变
DOI：
10.1016/j.jallcom.2019.07.227
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发表时间：
2019
影响因子：
6.2
通讯作者：
Gao Feng
中科院分区：
文献类型：
--
作者：
Jin Li;Pang Jing;Luo Wenting;Lan Yu;Du Hongliang;Yang Shuai;Li Fei;Tian Ye;Wei Xiaoyong;Xu Zhuo;Guo Dong;Gao Feng
Bi(Li0.5Nb0.5)O3(BLN) was adopted to tailor the Curie temperature (TC) and the resulting ferroelectric and electrostrictive properties of solid solutions of the morphotropic phase boundary relaxor ferroelectric 0.67 Pb(Mg1/3Nb2/3)O3-0.33PbTiO3(0.67PMN-0.33 PT). The ceramic samples were synthesized by a solid reaction method, and the BLN content was set to 2.5 at.%, 5 at.%, 7.5 at.%, and 10 at.%. X-ray diffraction results suggested that BLN cannot enter the 0.67PMN-0.33 PT crystal lattice completely, resulting in the formation of a second phase (Pb2Ti2O6with pyrochlore structure) in all the samples. With increasing BLN content, a decrease inTCand a ferroelectric-to-relaxor transition were revealed by the dielectric and ferroelectric properties. High electric-field-induced strains of 0.167%–0.228% with low hysteresis (<7%) were observed in the samples. Most importantly, an almost purely electrostrictive strain of 0.184% with ultralow hysteresis (<2%) was obtained in the 7.5 at.% BLN-doped sample. The thermal stability of the strains in the bipolar and unipolar modes were evaluated from 30 to 120 °C. The longitudinal electrostrictive coefficientQ33ranged from 0.150 to 0.185 m4/C2and was insensitive to temperature. Our results suggest that BLN-doped 0.67PMN-0.33 PT ceramics could have potential applications in actuator devices owing to their high strain response and ultralow hysteresis.
