Wang Hongli, Zeng Kaiyang
The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China.
Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
Materials (Basel). 2021 Feb 10;14(4):855. doi: 10.3390/ma14040855.
The evolution of the domain structures of []-oriented relaxor ferroelectric 0.93PbZnNbO-0.07PbTiO (PZN-7%PT) single crystals as a function of temperature was investigated in situ by using piezoresponse force microscopy (PFM). It was found that the local domain structure of PZN-7%PT single crystals at room temperature is rhombohedral with nanoscale twins. Temperature-dependent domain structures showed that the phase transition process is a collective process and that the sample underwent a sequence of rhombohedral (R) → monoclinic (Mc) → tetragonal (T) → cubic (C) phase transformations when the temperature increased from 25 °C to 170 °C. The results provide direct observation of the phase transition evolution of PZN-7%PT single crystals as a function of temperature, which is of great significance to fully understand the relationships between the domain structure and phase structure of PZN-7%PT single crystals.
利用压电力显微镜（PFM）原位研究了[取向的弛豫铁电体0.93PbZnNbO-0.07PbTiO（PZN-7%PT）单晶的畴结构随温度的演变。研究发现，PZN-7%PT单晶在室温下的局部畴结构为具有纳米级孪晶的菱面体结构。温度依赖的畴结构表明，相变过程是一个集体过程，当温度从25℃升高到170℃时，样品经历了菱面体（R）→单斜（Mc）→四方（T）→立方（C）的一系列相变。这些结果提供了PZN-7%PT单晶相变演变随温度变化的直接观察结果，这对于充分理解PZN-7%PT单晶的畴结构和相结构之间的关系具有重要意义。
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