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

Significant applications of SrTiO3 single crystals in electronics require knowledge about the influence structural imperfections on their optical properties. Birefringence temperature changes were investigated a few broad range, from 85 K to 250 K. The birefringence was found be non-linear function below transition Ts at 105 K, and indicatrix orientation accompanied it. A weak residual permanently present dozen degrees above phase Ts. This is mainly connected with dislocations, which induce local stresses shift points even up 200 essential role properties studied 24° bi-crystal reduced 1000 under low oxygen pressure. In such an intentionally defected crystal, increase non-linearities Δn(T) dependence observed point