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- W1968617668 abstract "The crystallisation kinetics of a Li0.6Al0.1Si0.6O1.65 glass matrix has been performed by means of X-ray powder diffraction. Data diffraction have shown the simultaneous formation of two crystalline phases Li2SiO3 and Li0.6Al0.6Si2.4O6 (so-called virgilite) for heat treatments conducted at 700 and 750 °C. The kinetic parameters of crystallisation have been determined for each phase from several time-dependent X-ray diffraction studies. The two values of the Avrami exponent, close to 1.5, suggest that crystallisation is controlled by a diffusion process, the nucleation being non-existent in the temperature range from 700 to 750 °C. With regard to the activation energy of the overall crystallisation phenomenon, the values obtained, close to 175 kJ mol−1, provide to this glass a relative ability to crystallise compared to others glasses from MSiAlO systems, where M is an alkaline-earth or a rare-earth element. With respect to the Li0.6Al0.6Si2.4O6 phase, long time heat treatments at 750 °C have revealed a phase transition from the hexagonal symmetry to the tetragonal one. The corresponding value of the Avrami exponent (i.e., 1) suggests a diffusionless transformation with a one-dimensional growth." @default.
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- W1968617668 date "2002-06-01" @default.
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- W1968617668 title "The devitrification of a LAS glass matrix studied by X-ray powder diffraction" @default.
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- W1968617668 doi "https://doi.org/10.1016/s1293-2558(02)01291-8" @default.
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