Abstract
The devitrification of the 13.3% MgO-32.0% Al2O3-52.7% SiO2-2.0% BaO ceramic-glass via isochronal heating up to a stable crystalline structure has been studied by the positron annihilation technique. The lifetime spectra showed two components. This devitrification results as a two-stage process. The long-lifetimeΤ 2, attributed to the pick-off annihilation ofortho-Ps states, decreased on crystallization, but it was insensitive to the hexagonal-orthorhombic transformation of the crystalline cordierite. On the contrary, the effective lifetime of positrons annihilating in states that are not Ps, increased. This increase has been attributed to the Al/Si order process inherent to the hexagonal-orthorhombic transformation. Moreover, the Ps fraction in the crystalline phases was higher than in the glassy phase. However the free volume model might qualitatively explain the relationship observed betweenI 2 andΤ 2.
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Pedrosa, M.A., Pareja, R. Positron lifetime study of the devitrification process in a cordierite glass. J Mater Sci 20, 4501–4506 (1985). https://doi.org/10.1007/BF00559340
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DOI: https://doi.org/10.1007/BF00559340