铁电性
电场
凝聚态物理
电介质
相界
材料科学
四方晶系
单斜晶系
大气温度范围
磁滞
相(物质)
结晶学
晶体结构
化学
物理
热力学
量子力学
光电子学
有机化学
作者
Aftabuzzaman,Seiji Kojima
标识
DOI:10.7567/jjap.55.07kb03
摘要
Abstract The relaxor ferroelectric (1 − x )Pb(Mg 1/3 Nb 2/3 )O 3 – x PbTiO 3 ( x = 0.30, PMN–30PT) single crystal was studied under the zero field and the externally applied dc electric field by using micro-Brillouin scattering and dielectric spectroscopies over a wide temperature range of 303–773 K. The noticeable thermal hysteresis of longitudinal acoustic (LA) shift (ν B ) was observed between zero field heating and zero field cooling processes. Under the electric field of 0.5 kV/cm along the [001] axis, the LA mode splitting was observed in ν B due to the coexistence of ferroelectric macrodomain and nanodomain states caused by the random field, and in dielectric measurements the monoclinic (M) and tetragonal phases were appeared between rhombohedral and cubic phases. The LA mode splitting and M phase disappeared under the field of 1.0 kV/cm. The electric field dependence of LA velocity was studied at 304 K. The critical end point of the PMN–30PT single crystal was investigated.
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