Experimental study of photon correlation spectroscopy for the long-range fluctuation of polarization in ferroelectrics
Zhang, MJ; Guo, Z; Tai, RZ; Zhang, XZ; Luo, HS; Guo, Z (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China.
2015
发表期刊ACTA PHYSICA SINICA
ISSN1000-3290
卷号64期号:14页码:
文章类型期刊文献
摘要Based on the theory of random fluctuation of polarization clusters and the model of Wiener random process, the relaxation law of long-range fluctuation of polarization and the possible forms of light intensity autocorrelation function g(2) (tau) measured from photon correlation spectroscopy (PCS) experiments have been derived. The relationship between relaxation mechanisms of microscopic polarization clusters and macro relaxation laws is expounded. This research supplies a theoretical model for the application of PCS in researching the relaxation process of polarization clusters in ferroelectrics. Based on the improved He-Ne laser PCS experimental set-up, the relaxation process of long-range fluctuation of polarization clusters in BaTiO3 and 0.71Pb (Mg1/3Nb2/3) O-3-0.29PbTiO(3) single crystals near phase transition temperature is studied. As for BaTiO3, the dual relaxation processes of long-range fluctuation of polarization clusters are observed at temperatures above T-C+4 K, which may be related to its order-disorder mechanism of phase transition. For 0.71Pb (Mg1/3Nb2/3) O-3-0.29PbTiO(3), the dual relaxation processes exist on both sides of the cubic-tetragonal phase transition temperature. The PCS experimental results are fitted well by the derived theoretical model, and the characteristic relaxation times of long-range fluctuation of polarization clusters are extracted. Two relaxation times, tau(s) and tau(l) corresponding to short and long relaxation time, respectively, are initially observed, where tau(s) is several microseconds, and tau(l) is tens of microseconds. The abrupt increase of relaxation times at phase transition temperature and the phenomenon of critical slowing down can be observed in the two samples.
关键词Relaxor Ferroelectrics Cubic Batio3 Neutron-scattering Light-scattering Chain Structure Knbo3 Phase Mode
收录类别SCI
语种英语
WOS记录号WOS:000362976400042
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/24925
专题中科院上海应用物理研究所2011-2018年
通讯作者Guo, Z (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China.
推荐引用方式
GB/T 7714
Zhang, MJ,Guo, Z,Tai, RZ,et al. Experimental study of photon correlation spectroscopy for the long-range fluctuation of polarization in ferroelectrics[J]. ACTA PHYSICA SINICA,2015,64(14):—.
APA Zhang, MJ,Guo, Z,Tai, RZ,Zhang, XZ,Luo, HS,&Guo, Z .(2015).Experimental study of photon correlation spectroscopy for the long-range fluctuation of polarization in ferroelectrics.ACTA PHYSICA SINICA,64(14),—.
MLA Zhang, MJ,et al."Experimental study of photon correlation spectroscopy for the long-range fluctuation of polarization in ferroelectrics".ACTA PHYSICA SINICA 64.14(2015):—.
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