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• W1963519752 abstract "Parallel and perpendicular-polarized Raman spectra and KBr transmission IR spectra of glasses of the compositions 10K2O·50SiO2−nLa2O3 (n = 0, 1, 5, 10 mol) and (10−x)K2O−50SiO2−(x3)La2O3 (x = 0, 6, 7.5) are presented. Increasing lanthanum concentration in glasses with fixed K:Si produces partially polarized high-frequency bands at 1030, 940 and 860 cm−1, in order of appearance. These are assigned to the symmetric stretching modes of SiO bonds in SiO4 tetrahedra containing 1, 2 and 4 non-bridging oxygens, respectively, whose non-bridging oxygens coordinate with lanthanum. Since no disilicate or metasilicate crystals occur in the La2O3SiO2 binary, lanthanum coordinates with silicate anions in glasses inaccessible to it in binary silicate crystals. Lanthanum forms coordination polyhedra of non-bridging oxygen without the aid of potassium; therefore, the solution chemistry of lanthanum in these glasses is governed by homogeneous equilibria between different silicate anions bonded to lanthanum. Glass-glass phase separation of 10K2O50SiO210La2O3 when heated to 900°C indicates that these homogeneous equilibria produce regions within the glass relatively rich in LaOSi bonds but depleted in SiOSi linkages." @default.
• W1963519752 created "2016-06-24" @default.
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• W1963519752 date "1991-02-01" @default.
• W1963519752 modified "2023-09-27" @default.
• W1963519752 title "Vibrational spectra of high-silica glasses of the system K2OSiO2La2O3" @default.
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• W1963519752 doi "https://doi.org/10.1016/0022-3093(91)90477-n" @default.
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