Transition between the ferroelectric and relaxor states in0.8Pb(Mg1∕3Nb2∕3)O3−0.2PbTiO3ceramics
Transition between the ferroelectric and relaxor states in0.8Pb(Mg1∕3Nb2∕3)O3−0.2PbTiO3ceramics
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DOI：
10.1103/physrevb.74.184106
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发表时间：
2006-11
影响因子：
3.7
通讯作者：
R. Jiménez;B. Jiménez;J. Carreaud;J. Kiat;B. Dkhil;J. Holc;M. Kosec;M. Algueró
中科院分区：
文献类型：
--
作者：
R. Jiménez;B. Jiménez;J. Carreaud;J. Kiat;B. Dkhil;J. Holc;M. Kosec;M. Algueró
通过测量介电和弹性性能随温度和热膨胀的变化，研究了化学均匀度较高的$0.8\mathrm{Pb}({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}\text{\ensuremath{-}}0.2\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$陶瓷的铁电态和弛豫态之间的相变。用X射线衍射谱的Rietveld分析和铁电磁滞回线研究了陶瓷和粉末样品的室温铁电相结构。结果表明，该材料具有明确的转变温度和不同的冻结温度，如在单斜晶CM铁电相和非遍历玻璃态之间的转变。这一转变不仅在转变温度上，而且在动力学上都表现出热滞现象。这表明在334到344美元之间的温度区间发生了相当剧烈的减速。
The phase transition between the ferroelectric and relaxor states for $0.8\mathrm{Pb}({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}\text{\ensuremath{-}}0.2\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ ceramics with high chemical homogeneity has been studied by measurements of the dielectric and elastic properties as a function of temperature and of thermal expansion. The room temperature ferroelectric phase structure has been studied in ceramics and powdered samples by Rietveld analysis of x-ray diffraction patterns and by ferroelectric hysteresis loops. Results indicate that the material has well defined, different transition and freezing temperatures, such as the transition is between a monoclinic Cm ferroelectric phase and the nonergodic glass state. The transition presents thermal hysteresis, not only in the transition temperature, but in the kinetics. This indicates that a quite sharp slowing down occurs in the temperature interval between 334 and $344\phantom{\rule{0.3em}{0ex}}\mathrm{K}$: the transition temperatures on cooling and heating.