CAJ | 학술논문

BaTiO3中存在极化团簇已经被大量实验所证明,并且极化团簇的空间、时间信息以及随温度的演化信息对介电性质有着重要影响.因此探测BaTiO3中极化团簇的相关信息对于理解其功能和揭示相变机理具有重要意义.本实验利用光子相关谱方法,在精确温控的条件下,观测到BaTiO3 中300 nm周期长程极化团簇微秒量级的特征弛豫时间τc,并揭示了该时间在Tc附近4 K温度范围内变化的细节特征.实验表明光子关联谱是研究铁电动力学的有效方法.
BaTiO3중존재겁화단족이경피대량실험소증명,병차겁화단족적공간、시간신식이급수온도적연화신식대개전성질유착중요영향.인차탐측BaTiO3중겁화단족적상관신식대우리해기공능화게시상변궤리구유중요의의.본실험이용광자상관보방법,재정학온공적조건하,관측도BaTiO3 중300 nm주기장정겁화단족미초량급적특정이예시간τc,병게시료해시간재Tc부근4 K온도범위내변화적세절특정.실험표명광자관련보시연구철전동역학적유효방법.
A number of experiments have proved that polarization clusters exists in BaTiO3 and excellent properties of BaTiO3 are related to a great extent with spatiotemporal information of polarzition clusters. The measurement of temporal state is essential to discuss the characteristics of the polarization clusters and to recognize the nature of the ferroelectric phase transition. In our experiment,the 300 nm long range polarization clusters in BaTiO3 were found to be dynamic with characteristic relaxation time (τc) of several microseconds by Photon Correlation Spectroscopy (PCS). The evolution details of the relaxation time were also revealed clearly in the vicinity of TC. It has proved that PCS is an effective method for the probing of dynamic process among ferroelectrics.