Experimental study of photon correlation spectroscopy for the long-range fluctuation of polarization in ferroelectrics
文献类型：期刊论文
| 作者 | Zhang, MJ; Guo, Z; Tai, RZ; Zhang, XZ; Luo, HS |
| 刊名 | ACTA PHYSICA SINICA
 |
| 出版日期 | 2015 |
| 卷号 | 64期号:14页码:— |
| 关键词 | RELAXOR FERROELECTRICS CUBIC BATIO3 NEUTRON-SCATTERING LIGHT-SCATTERING CHAIN STRUCTURE KNBO3 PHASE MODE |
| ISSN号 | 1000-3290 |
| 通讯作者 | Guo, Z (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China. |
| 英文摘要 | 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000362976400042 |
| 公开日期 | 2016-03-08 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/24925]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 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.(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):—. |
入库方式： OAI收割
来源：上海应用物理研究所
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