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- W2312553402 abstract "Abstract Bi 2 O 3 -rich glasses belonging to the system x Gd 2 O 3 (1− x )[0.857Bi 2 O 3 ·0.143GeO 2 ] with 0.005≤ x ≤0.1, have been obtained by rapid cooling of the melts. Polycrystalline samples have been further obtained by applying a heat treatment at 600ºC for 24 h. Both types of samples were structurally characterized by using X-ray diffraction (XRD), and infrared (IR) and Raman spectroscopic techniques. Local structural units for the investigated samples are identified on the basis of vibrational spectroscopic data. The obtained data reveal the presence of GeO 4 , GeO 6 , BiO 3 and BiO 6 groups as basic structural units of the networks. For the vitroceramic samples some changes occur in their network, mainly reflecting the presence of an ordered structure, but much important is that part of the BiO 6 structural units from Bi 2 O 3 -GeO 2 glass network are converting into BiO 3 units. The IR and Raman results support the idea that the local structure of the glasses and vitroceramics is less affected by the presence of Gd 3+ ions but there is strong long range order influence on developed crystalline phases from vitroceramic samples, as proved by XRD. However, the spectral analyses reveal the formation of a structure with a higher disorder degree for x =0.1 in comparison with the other investigated vitroceramics as a result of the partial replacement of the Bi 3+ ions with Gd 3+ ions. Starting from the Bi 12 GeO 20 sellenite phase in the samples with low gadolinium content ( x ≤0.01), the structure is change to Bi 24 GeO 38 phase, via a BiLa type structure, when the Gd 2 O 3 concentration is increasing up to x =0.1." @default.
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- W2312553402 date "2011-01-28" @default.
- W2312553402 modified "2023-09-24" @default.
- W2312553402 title "Vibrational Spectroscopic Studies of Germanium-High Bismuthate Glasses and Vitroceramics" @default.
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- W2312553402 doi "https://doi.org/10.1524/zpch.2011.0079" @default.
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