A glass of composition: SiO2 = 59•84%; Al2O3 = 11•45%; MgO = 15•34%; TiO2 = 4•23%; K2O = 3•80%; Na2O = 2•48%; CaO = 1•08%; Fe2O3 = 1•78%; was prepared from porphyric sands by addition of MgO and TiO2. The quenched glass is demixed on a very fine scale. The non-isothermal devitrification has been studied. Three-dimensional crystal growth has been observed. The experimental data suggest a mechanism controlled by the crystal-glass interface reaction. The crystal growth activation energy Ec = 467 ± 20 kJ/mole has been evaluated. The temperature of most efficient nucleation is approximately TN = 720°C.

"Devitrification of a glass obtained from porphiric sands, MgO(15%) and TiO2(4%) / Branda, Francesco; Costantini, Aniello; P., Scardi; A., Tomasi. - In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. - ISSN 0955-2219. - ELETTRONICO. - (1990), pp. 391-395.

"Devitrification of a glass obtained from porphiric sands, MgO(15%) and TiO2(4%)

BRANDA, FRANCESCO;COSTANTINI, ANIELLO;
1990

Abstract

A glass of composition: SiO2 = 59•84%; Al2O3 = 11•45%; MgO = 15•34%; TiO2 = 4•23%; K2O = 3•80%; Na2O = 2•48%; CaO = 1•08%; Fe2O3 = 1•78%; was prepared from porphyric sands by addition of MgO and TiO2. The quenched glass is demixed on a very fine scale. The non-isothermal devitrification has been studied. Three-dimensional crystal growth has been observed. The experimental data suggest a mechanism controlled by the crystal-glass interface reaction. The crystal growth activation energy Ec = 467 ± 20 kJ/mole has been evaluated. The temperature of most efficient nucleation is approximately TN = 720°C.
1990
"Devitrification of a glass obtained from porphiric sands, MgO(15%) and TiO2(4%) / Branda, Francesco; Costantini, Aniello; P., Scardi; A., Tomasi. - In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. - ISSN 0955-2219. - ELETTRONICO. - (1990), pp. 391-395.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/483254
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