The role of nano-dimensional structural defects in the optical absorption of Bi12SiO20 crystals

Optical absorption of Bi 12 SiO 20 crystals containing nonstoichiometry defects in the cation sublattices was studied in the temperature range 80 ÷ 600 K. It is shown that, at absorption coefficients the Urbach rule is fulfilled; while at indirect transitions with the participation of optical phonon...

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Bibliographic Details
Published inMolecular Crystals and Liquid Crystals Vol. 673; no. 1; pp. 155 - 161
Main Authors Diachenko, A. O., Panchenko, T. V.
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis 22.09.2018
Taylor & Francis Ltd
Subjects
Absorption
Absorptivity
Bi12SiO20 crystals
Bismuth silicon oxide
Crystal defects
Crystal structure
Crystals
optical absorption
Parameters
Stoichiometry
structural defects
Temperature
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Summary:Optical absorption of Bi 12 SiO 20 crystals containing nonstoichiometry defects in the cation sublattices was studied in the temperature range 80 ÷ 600 K. It is shown that, at absorption coefficients the Urbach rule is fulfilled; while at indirect transitions with the participation of optical phonons take place. The value α t depends on temperature. The parameters of the Urbach rule change regularly when the Bi:Si stoichiometry is violated. The features of the isoabsorption dependences and the parameter σ characterizing the temperature change of the edge absorption are revealed.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2019.1578505