Synthesis of Bi2Ge3O9

Bermeshev, T. V.; Zhereb, V. P.; Bundin, M. P.; Yasinsky, A. S.; Yushkova, O. V.; Voroshilov, Denis Sergeevich; Zaloga, A. N.; Kovaleva, A. A.; Yakivyuk, O. V.; Samoilo, Alexander S.; Mazurova, E. V.

doi:10.1134/s0020168522120020

Cited by 1 publication

(4 citation statements)

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“…The glass transition temperatures of bismuth-containing glasses were lower compared to the temperature of pure GeO2 glass (519 °C [29]), probably due to a decrease in melt viscosity upon the introduction of Bi2O3. The resulting range of Tg values (440-480 °C) was in good agreement with the data previously reported [30][31][32][33].…”

Section: Discussionsupporting

confidence: 91%

“…The simultaneous existence of both modifications of crystalline GeO 2 correlated well with the metastable phase diagram [3], in which ~600 • C served as the transition temperature between α-GeO 2 and β-GeO 2 polymorphs. The Bi 2 GeO 5 phase, noted in the same phase diagram, was unstable in this concentration range, as shown in [33], and appeared only in trace amounts in the 5-95 sample according to XRD patterns (see Figure 10).…”

Section: Discussionmentioning

confidence: 59%

“…The simultaneous existence of both modifications of crystalline GeO2 correlated well with the metastable phase diagram [3], in which ~600 °C served as the transition temperature between α-GeO2 and β-GeO2 polymorphs. The Bi2GeO5 phase, noted in the same phase diagram, was unstable in this concentration range, as shown in [33], and appeared only in trace amounts in the 5-95 sample according to XRD patterns (see Figure 10). Crystallization in the 550-640 °C temperature range leads to the formation of the Bi4Ge3O12 phase [30][31][32], alone or together with other phases for glass compositions containing 10-40 mol% Bi2O3.…”

Section: Discussionmentioning

confidence: 59%

“…This assumption was also supported by the fact that the Bi2GeO5 phase disappearance was noted in [36] when the hea treatment temperature increased above 640 °C. Heat-treatment of 25-75 glass (Figure S18) at 690 °C led to the Bi4Ge3O12 and Bi2Ge3O9 phases' formation in agreement with [33,34]. An increase of the heat treatment temperature to 720 °C for the 25-75 glass led t an insignificant decrease in the amount of the Bi2Ge3O9 phase, whose composition corre sponded to that of glass; therefore, the crystallization maximum at 690 °C on the DSC curve corresponded to the Bi2Ge3O9 phase formation.…”

Section: Discussionmentioning

confidence: 71%

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Bismuth-Germanate Glasses: Synthesis, Structure, Luminescence, and Crystallization

et al. 2023

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Bismuth-germanate glasses, which are well known as a promising active medium for broadband near-infrared spectral range fiber lasers and as an initial matrix for nonlinear optical glass ceramics, have been synthesized in a 5–50 mol% Bi2O3 wide concentration range. Their structural and physical characteristics were studied by Raman and FT-IR spectroscopy, differential scanning calorimetry, X-ray diffraction, optical, and luminescence methods. It has been found that the main structural units of glasses are [BiO6] and [GeO4]. The growth in bismuth oxide content resulted in an increase in density and refractive index. The spectral and luminescent properties of glasses strongly depended on the amount of bismuth active centers. The maximum intensity of IR luminescence has been achieved for the 5Bi2O3-95GeO2 sample. The heat treatment of glasses resulted in the formation of several crystalline phases, the structure and amount of which depended on the initial glass composition. The main phases were non-linear Bi2GeO5 and scintillating Bi4Ge3O12. Comparing with the previous papers dealing with bismuth and germanium oxide-based glasses, we enlarge the range of Bi2O3 concentration up to 50 mol% and decrease the synthesis temperature from 1300 to 1100 °C.

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