Heterophase fluctuations near T c in relaxor ferroelectrics (1-x)Pb(Zn1/3Nb 2/3)O3-xPbTiO3 (x=0.09) studied by x-ray diffuse scattering and coherent x-ray scattering.
Heterophase fluctuations near T c in relaxor ferroelectrics (1-x)Pb(Zn1/3Nb 2/3)O3-xPbTiO3 (x=0.09) studied by x-ray diffuse scattering and coherent x-ray scattering.
复制标题
通过 X 射线漫散射和相干 X 射线散射研究了弛豫铁电体 (1-x)Pb(Zn1/3Nb 2/3)O3-xPbTiO3 (x=0.09) 中 T c 附近的异相涨落。
DOI：
10.1103/physrevb.90.104109
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发表时间：
2014
影响因子：
3.7
通讯作者：
and K. Namikawa
中科院分区：
文献类型：
--
作者：
K. Ohwada;J. Mizuki;M. Matsushita;and K. Namikawa
用X射线漫散射(XDS)和相干X射线散射(CXS)相结合的方法研究了Pb2+(K冷却时)的顺电(PE)到铁电(FE)的一级相变。XDS主要用于研究FE区，而CXS主要用于研究冷却过程中的PE区。由于FE区域的出现，漫散射强度显示出最大的ATK。漫散射本质上是动态的，软化趋势变为硬化趋势。这意味着有限元不稳定性最大，因此有限元区域在下面得到很好的稳定。由CXS得到的对应于PE区域纹理的空间自相关函数在大约开始快速变化，并且在最不稳定。我们得出的结论是，在相变之间和相变附近发生了异相涨落。可以预期，异相涨落与低频介电色散相关，并作为一级相变的前驱现象而促成相变。
The paraelectric (PE) to ferroelectric (FE) first-order phase transition of ()Pb()() (K on cooling) has been studied by the complementary use of x-ray diffuse scattering (XDS) and coherent x-ray scattering (CXS). XDS was mainly used to investigate the FE regions, while CXS was mainly used to investigate the PE regions aboveon cooling. The diffuse scattering intensity due to the appearance of FE regions shows a maximum atK. The diffuse scattering is dynamic in nature and the softening trend changes to a hardening trend at. This means that the FE instability is maximum atand therefore the FE regions are well stabilized below. The spatial autocorrelation function obtained by CXS, corresponding to the texture of PE regions, starts to rapidly change at aboutand is most unstable at. We conclude that a heterophase fluctuation occurs betweenandnear the phase transition. The heterophase fluctuation can be expected to correlate to the low-frequency dielectric dispersion and contribute to the phase transition as a precursor phenomenon of the first-order phase transition.