Crossover from Duffuse to Sharp Phase Transition by Electric Field in 0.955Pb(Zn1/3Nb1/3)O3-0.04PbTiO3
Crossover from Duffuse to Sharp Phase Transition by Electric Field in 0.955Pb(Zn1/3Nb1/3)O3-0.04PbTiO3
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0.955Pb(Zn1/3Nb1/3)O3-0.04PbTiO3 中电场从弥漫相转变到尖锐相变
DOI：
10.1088/1757-899x/54/1/012005
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
S. Kojima
中科院分区：
文献类型：
--
作者：
S.Tsukada;Y. Akishige;T. H. Kim;S. Kojima
通过介电特性和纵向声学（LA）声子研究了沿[100]方向电场对弛豫铁电晶体0.955 Pb (Zn 1/3 Nb 2/3) O 3-0.045 pbtio3 （PZN-0.045 PT）扩散相变的影响。与零场冷却时观察到的PZN-0.045 PT的弥漫性相变相比，场冷却时出现了两个明显的相变。这一结果表明，电场通过将静态极性纳米区和微畴生长为更大的铁电畴的方式降低了非均匀性。从热力学角度看，电场增强了非平衡态向平衡态的弛豫。同时，随着沿[100]方向电场的增大，铁电四方相趋于稳定。
Effect of an electric field along [100] direction on diffuse phase transitions in a relaxor ferroelectric 0.955 Pb (Zn 1/3 Nb 2/3) O 3-0.045 PbTiO 3 (PZN-0.045 PT) crystal is studied through dielectric properties and a longitudinal acoustic (LA) phonon. Compared with the diffuse phase transition observed in zero-field cooling in PZN-0.045 PT, it shows two sharp phase transitions under field cooling. This result indicates that inhomogeneity is reduced by the electric field in the way that electric field grows the static polar nanoregions and microdomains into larger ferroelectric domains. From a thermodynamic point of view, the electric field enhances the relaxation from the nonequilibrium polymorphic states to the equilibrium homogeneous state. At the same time, ferroelectric tetragonal phase is stabilized with increasing an electric field along [100].