Abstract
We present information about temperature dependence of optical properties of two different strontium bismuthates. We demonstrate that temperature dependencies of Urbach energy of two strontium bismuthates differ radically. Abnormal behavior of Urbach focus of strontium bismuthate Sr2Bi2O5 is observed. We assume existence of phase transit in strontium bismuthate Sr2Bi2O5 at the temperature around 305 K.
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