Synthesis of a bismuth germanium oxide source material for Bi4Ge3O12 crystal growth |
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Authors: | I I Novoselov I V Makarov V A Fedotov N V Ivannikova Yu V Shubin |
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Affiliation: | 195. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 3, Novosibirsk, 630090, Russia
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Abstract: | A technique has been developed for the preparation of a modified source material for the crystal growth of bismuth orthogermanate, Bi4Ge3O12 (BGO). It includes dispersion of molten bismuth through mixing with germanium oxide (GeO2) powder in a rotating reactor, followed by oxidation with oxygen. The source material thus prepared contains, in addition to bismuth and germanium oxides, considerable proportions of germanates (Bi2GeO5, Bi4Ge3O12, and Bi12GeO20), which improve the reactivity of the components of the source material during homogenization before the crystal growth process. After sintering at 880°C, the density of the modified source material (3.9 g/cm3) is a factor of 1.5 higher than that of a source material prepared from Bi2O3 and GeO2 powders. BGO crystals grown using the synthesized source material possess good scintillation characteristics. |
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