四方晶系
相界
单斜晶系
材料科学
结晶学
铁电性
凝聚态物理
订单(交换)
相(物质)
相变
三角晶系
物理
晶体结构
电介质
化学
量子力学
光电子学
财务
经济
作者
S. Kustov,Juan Miguez Obrero,Xiebin Wang,Dragan Damjanović,E. K. H. Salje
出处
期刊:Physical Review Materials
[American Physical Society]
日期:2022-12-28
卷期号:6 (12)
被引量:3
标识
DOI:10.1103/physrevmaterials.6.124414
摘要
Structural transformations of unpoled $(1\ensuremath{-}x)\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3\ensuremath{-}x}\mathrm{PbTi}{\mathrm{O}}_{3}\phantom{\rule{0.28em}{0ex}}(\mathrm{PMN}\text{\ensuremath{-}}\mathrm{PT})$ single crystals ($x=0.28$ and $x=0.32$) were analyzed by calorimetry and acoustic spectroscopy. The compositions are close to the morphotropic boundary (MPB). We find extended two-phase regions where cubic and rhombohedral ($x=0.28$), cubic and tetragonal, tetragonal and monoclinic phases ($x=0.32$) coexist during cooling and heating. The observed structural transitions in PMN-PT are first order, despite their proximity to the MPB. The predicted tricritical points, if they exist, are possibly located extremely close to the MPB.
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