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Synthesis and X-ray structural investigation of undoped borate glasses

Padlyak B. V., Mudry S. I., Kulyk Y. O., Drzewiecki A., Adamiv V. T., Burak Y. V., Teslyuk I. M.

Materials Science Poland

2012

Vol. 30, No. 3

264--273

A series of undoped borate glasses: Li2B4O7, LiKB4O7, LiB3O5, SrB4O7, and LiCaBO3 of high optical quality and chemical purity were obtained from the corresponding polycrystalline compounds using standard glass synthesis under technological conditions developed by the authors. The glasses were obtained by rapid cooling of molten crystalline material, which was heated to 100 K above the melting point to prevent crystallization and to exceed the glass transition point. The X-ray diffraction intensity profiles of the investigated glasses were typical of glassy compounds. The most typical intensity profile, consisting of almost symmetrical peaks, was observed in the case of Li2B4O7 and LiB3O5. Substitution and partial substitution of Li atoms by Sr and Ca atoms was accompanied by significant changes in the intensity profiles of the investigated glasses. Pair correlation functions and structural parameters (average interatomic distances and coordination number to oxygen) of the investigated glasses were evaluated and analyzed. Structural peculiarities of the investigated borate glasses are discussed in comparison with structural data available for their crystalline analogs.

Photoelastic propertiesof the beta barium borate crystals

Andrushchak A. S., Bobitski Y. V., Kaidan M. V., Adamiv V. T., Burak Y. V., Mytsyk B. G.

Optica Applicata

2003

Vol. 33, nr 2-3

345-357

The single crystals of the beta barium borate were grown by the top-seeded solution method. For these crystals all the components of piezooptic effect tensor were determined by a two-fold measurement method. Based on this method some magnitudes of elastic compliance coefficients were fixed. The magnitudes and signs of all elastooptic coefficients were also calculated, acoustic quality parameter was analysed and the possibility of using the beta barium borate crystals as perspective acoustooptic material was discussed.