Conoscopic study of strontium-barium niobate single crystals

International Conference on Functional Materials and Nanotechnologies 2013

材料科学;物理学

Kolesnikov, Aleksandr^1 ; Grechishkin, Rostislav^1 ; Malyshkina, Olga^1 ; Malyshkin, Yury^1 ; Dec, Jan^2 ; Lukasiewicz, Tadeusz^3 ; Ivanova, Aleksandra^1

Tver State University, Tver, Russia^1

Institute of Materials Science, University of Silesia, Katowice, Poland^2

Institute of Electronic Materials Technology, Warsaw, Poland^3

关键词: Annealing treatments;    Elevated temperature;    Interference figures;    Interference patterns;    Sensitive indicator;    Strontium barium niobate;    Temperature dependent;    Temperature variation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/49/1/012010/pdf
DOI  :  10.1088/1757-899X/49/1/012010

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Optically transparent single crystals of strontium-barium niobate, SrxBa1-xNb2O6, of different compositions (x 0.26...0.7) were examined with the aid of conoscopic light interference figures. A regular change of the isochrome concentric ring number and diameters consistent with the temperature variation of the value of birefringence is demonstrated by direct observations of polar cuts of optically uniaxial samples. Anomalous violations of the conventional (uniaxial) interference patterns occur occasionaly in some samples being indicative of the existence of biaxial trait in their behaviour even though no voltage is applied. These features may depend on annealing treatments at elevated temperatures. The results of the study show that conoscopic images may serve as a sensitive indicator of the structural state of SBN crystals related to the effects of stress-induced change of optical anisotropy and temperature dependent birefringence parameters.