Giant piezoelectricity of Sm-doped Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals
Giant piezoelectricity of Sm-doped Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals
复制标题
Sm掺杂Pb(Mg1/3Nb2/3)O-3-PbTiO3单晶的巨压电性
DOI：
10.1126/science.aaw2781
复制
发表时间：
2019-04-19
期刊：
影响因子：
56.9
通讯作者：
Zhang, Shujun
中科院分区：
文献类型：
--
作者：
Li, Fei;Cabral, Matthew J.;Zhang, Shujun
高性能的压电体使传感器和传感器在各种机电应用中受益。具有最高压电电荷系数(d(33))的材料是20年前发现的弛豫钛酸铅晶体。我们成功地生长出了Sm掺杂的PbTiO_3(Sm-PMN-PT)单晶，其d(33)值在每牛顿3400~4100皮库仑之间，与生长的单晶的d(33)值相差小于20%，表现出良好的性能均匀性。我们用扫描电子显微镜在原子尺度上表征了Sm-PMN-PT，并进行了第一性原理计算，确定了Sm-PMN-PT的巨压电性源于Sm~(3+)掺杂引起的局域结构不均一性的增强。因此，稀土掺杂被认为是一种引入局域结构异质性以提高弛豫铁电晶体的压电性的一般策略。
High-performance piezoelectrics benefit transducers and sensors in a variety of electromechanical applications. The materials with the highest piezoelectric charge coefficients (d(33)) are relaxor-PbTiO3 crystals, which were discovered two decades ago. We successfully grew Sm-doped Pb(Mg1/3Nb2/3)O-3-PbTiO3 (Sm-PMN-PT) single crystals with even higher d(33) values ranging from 3400 to 4100 picocoulombs per newton, with variation below 20% over the as-grown crystal boule, exhibiting good property uniformity. We characterized the Sm-PMN-PT on the atomic scale with scanning transmission electron microscopy and made first-principles calculations to determine that the giant piezoelectric properties arise from the enhanced local structural heterogeneity introduced by Sm3+ dopants. Rare-earth doping is thus identified as a general strategy for introducing local structural heterogeneity in order to enhance the piezoelectricity of relaxor ferroelectric crystals.