Influence of Defects-Induced Stresses on Birefringence in SrTiO3 Single Crystals

Significant applications of SrTiO3 single crystals in electronics require knowledge about the influence of structural imperfections on their optical properties. Birefringence temperature changes were investigated in a few SrTiO3 single crystals in a broad temperature range, from 85 K to 250 K. The b...

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Bibliographic Details
Published in:Crystals (Basel) 2023-07, Vol.13 (7), p.985
Main Authors: Lazar, Iwona, Szot, Krzysztof, Roleder, Krystian
Format: Article
Language:English
Subjects:
bi-crystal
Birefringence
Crystal defects
extended defects
Investigations
Light
Linear functions
Optical properties
Phase transitions
Single crystals
Stresses
strontium titanate
Strontium titanates
Transition points
Transition temperature
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Summary:Significant applications of SrTiO3 single crystals in electronics require knowledge about the influence of structural imperfections on their optical properties. Birefringence temperature changes were investigated in a few SrTiO3 single crystals in a broad temperature range, from 85 K to 250 K. The birefringence was found to be a non-linear function below the transition Ts at 105 K, and non-linear changes in the optical indicatrix orientation accompanied it. A weak residual birefringence was permanently present a dozen degrees above the phase transition temperature Ts. This is mainly connected with dislocations, which induce local stresses and shift transition points even up to about 200 K. The essential role of imperfections on optical properties was studied in a SrTiO3 24° bi-crystal reduced at 1000 K and under low oxygen pressure. In such an intentionally defected crystal, an increase of non-linearities in Δn(T) dependence was observed below and above the transition point Ts.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst13070985