Point defects and dichroism in langasite and langatate crystals

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• 作者：N. S. Kozlova ; O. A. Busanov ; E. V. Zabelina ; A. P. Kozlova…
• 刊名：Crystallography Reports
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：61
• 期：2
• 页码：275-284
• 全文大小：730 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Crystallography
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1562-689X
• 卷排序：61

文摘

The hypotheses about the nature of color centers in langasite family crystals that are discussed in the literature are analyzed. Optical transmission spectra in the wavelength range of 200–800 nm are recorded for langasite and langatate crystals grown in atmospheres of argon and argon mixed with oxygen in different concentrations, both in the initial state and after isothermal annealings at 1000°C in nitrogen, in air, or in vacuum. Dichroism is observed in langasite and langatate crystals, and spectral dependences of the degrees of dichroism are plotted.Original Russian Text © N.S. Kozlova, O.A. Busanov, E.V. Zabelina, A.P. Kozlova, M.B. Bykova, 2016, published in Kristallografiya, 2016, Vol. 61, No. 2, pp. 275–284.An erratum to this article can be found at http://dx.doi.org/10.1134/S1063774516040301.