Piezooptic Effect and Dislocation Structure in Paratellurite Single Crystals

Kolesnikov, A. I.; Kaplunov, I. A.; Иванова, А. И.; Tretiakov, S. A.; Malyshkina, O. V.; Гречишкин, Р. М.

doi:10.1080/00150193.2012.741939

Cited by 1 publication

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“…The effect of anomalous biaxiality in uniaxial crystals may be understood in the following way. In general the biaxiality may be induced by electrooptic and piezooptic effects or induced by internal mechanical stresses [16]. Since the samples under study possess piezoelectric properties, the respective piezomodule d 31 as determined at room temperature by the resonance-antiresonance method are given in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Conoscopic study of strontium-barium niobate single crystals

Kolesnikov

Гречишкин

Malyshkina

et al. 2013

IOP Conf. Ser.: Mater. Sci. Eng.

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Optically transparent single crystals of strontium-barium niobate, Sr x Ba 1-x Nb 2 O 6 , 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.

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Section: Resultsmentioning

confidence: 99%