Densification and crystallisation of celsian glass derived from alkoxide gel |
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Authors: | M Chen P F James W E Lee |
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Institution: | (1) Department of Engineering Materials, University of Sheffield, Sir Robert Hadfield Building, 4DU Sheffield S1, UK |
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Abstract: | High density (98% of theoretical) was achieved at 900°C for an all-alkoxide derived bulk celsian gel prior to crystallisation. TEM indicated that crystallisation was dominated by volume nucleation and growth of hexagonal disc shaped hexacelsian. Kinetic studies using SEM indicate a maximum nucleation rate at 980°C and an activation energy for crystal growth of 566 KJ/mol. The high rates of densification and of nucleation are attributed to the high OH content in the gel-derived glass. |
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Keywords: | gel-glass Celsian nucleation densification |
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