Diffuse phase transitions and random-field-induced domain states of the "relaxor" ferroelectric PbMg1/3Nb2/3O3.
Diffuse phase transitions and random-field-induced domain states of the "relaxor" ferroelectric PbMg1/3Nb2/3O3.
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DOI：
10.1103/physrevlett.68.847
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发表时间：
1992-02
影响因子：
8.6
通讯作者：
Westphal;Kleemann;Glinchuk
中科院分区：
文献类型：
--
作者：
Westphal;Kleemann;Glinchuk
${\mathrm{PbMg}}_{1/3}$${\mathrm{Nb}}_{2/3}$${\mathrm{O}}_{3}$ 中铁电相变的扩散是由于带电成分波动引起的猝灭随机电场所致。它们导致极端临界减速、冻结成纳米铁电域以及 ${\mathit{T}}_{\mathit{c}}$\ensuremath{\sim}212 K 以下极化的缓慢松弛。极化过程中巴克豪森的跳跃排除了先前推测的玻璃态。如果随机场被外部电场克服，则在 ${\mathit{T}}_{\mathit{c}}$ 处会出现介电常数的铁电异常。
The diffuseness of the ferroelectric phase transition in ${\mathrm{PbMg}}_{1/3}$${\mathrm{Nb}}_{2/3}$${\mathrm{O}}_{3}$ is proposed to be due to quenched random electric fields originating from charged compositional fluctuations. They are responsible for the extreme critical slowing down, the freezing into nanometric ferroelectric domains, and the slow relaxation of the polarization below ${\mathit{T}}_{\mathit{c}}$\ensuremath{\sim}212 K. Barkhausen jumps during poling exclude glassiness, which was conjectured previously. At ${\mathit{T}}_{\mathit{c}}$ a ferroelectric anomaly of the dielectric permittivity appears, if the random fields are overcome by an external electric field.