Aging-induced giant recoverable electrostrain in Fe-doped 0.62Pb(Mg1∕3Nb2∕3)O3–0.38PbTiO3 single crystals
Aging-induced giant recoverable electrostrain in Fe-doped 0.62Pb(Mg1∕3Nb2∕3)O3–0.38PbTiO3 single crystals
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DOI：
10.1063/1.2908230
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发表时间：
2008-04
影响因子：
4
通讯作者：
Zu-yong Feng;O. Tan;Weiguang Zhu;Yanmin Jia;Haosu Luo
中科院分区：
文献类型：
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作者：
Zu-yong Feng;O. Tan;Weiguang Zhu;Yanmin Jia;Haosu Luo
研究了0.2mol%Fe掺杂0.62PbO_3(Mg1/3Nb2/3)O_3-0.38PbTiO_3单晶的时效效应。作者发现，在1.2KV/mm的电场下，⟨-001⟩取向的四方晶体在时效过程中产生了双铁电滞回线和0.8%的巨型可恢复电应变。这一结果远高于同场作用下准同向相界附近晶体中的应变。这种老化效应归因于点缺陷介导的可逆磁区转换机制。在室温到160℃的宽温度范围内，1.2KV/mm的大应变(>；0.55%)表明时效单晶是一种很有前途的机电材料。
The aging effect of a 0.2mol% Fe-doped 0.62Pb(Mg1∕3Nb2∕3)O3–0.38PbTiO3 single crystal was investigated. The authors found that aging induced a double ferroelectric hysteresis loop and a giant recoverable electrostrain of 0.8% at an electric field of 1.2kV∕mm in the ⟨001⟩-oriented tetragonal crystal. This result is much higher than the strains obtained in crystals near the morphotropic phase boundary under the same field. Such aging effect is attributed to a point-defect-mediated reversible domain-switching mechanism. Large electrostrains (>0.55%) at 1.2kV∕mm for a broad temperature from room temperature to 160°C suggest that the aged single crystal is a promising electromechanical material.