INVESTIGATION OF THE ELECTROGYRATION EFFECT OF FERROELECTRIC PB5GE3O11 BY CIRCULAR DICHROISM
INVESTIGATION OF THE ELECTROGYRATION EFFECT OF FERROELECTRIC PB5GE3O11 BY CIRCULAR DICHROISM
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圆二色性研究铁电体PB5GE3O11的电旋效应
DOI：
10.1088/0953-8984/3/19/016
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Y. Fukushima
中科院分区：
文献类型：
--
作者：
Y. Uesu;N. Okada;Y. Fukushima
为了阐明电回转效应的微观来源，精确测定了铁电材料Pb5Ge3O11的圆二向色性随电场和温度的变化。从在410 nm附近观察到的圆二色光谱，可以确定Pb2+离子内6s到6p跃迁的旋光强度的符号和大小。旋转强度在电场作用下表现出滞后环，其大小随自发极化强度的变化而变化。这一发现证实了作者之前的命题，即电回转效应源于旋转强度的变化。这一结论也是在群论的基础上得到检验的。用Kramers-Kronig关系式计算的旋光功率与实验值进行了比较。讨论了计算震级与实验震级相差很大的原因。
The circular dichroism of the ferroelectric Pb5Ge3O11 was precisely determined as a function of electric field and temperature in order to clarify the microscopic origin of the electrogyration effect. From the circular dichroic spectrum, which was observed near 410 nm and identified as being due to the intra-ionic 6s to 6p transition in Pb2+, the sign and magnitude of the rotatory strength could be determined. The rotatory strength exhibited a hysteresis loop under the electric field and its magnitude varied with the spontaneous polarization. The finding confirms the authors' previous proposition that the electrogyration effect originates from the change in the rotatory strength. This conclusion is also examined on the basis of group theory. The optical rotatory power calculated through the Kramers-Kronig relation was compared with the experimental value. The origin of the enormous difference between the calculated and experimental magnitudes is discussed.