Disproportionation of Q m (0 ≤ m ≤ 4) species in partially devitrified Li2Si2O5 glasses with small amounts of P2O5 |
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Authors: | M. G. Mortuza M. R. Ahsan R. Dupree D. Holland |
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Affiliation: | (1) Department of Physics, University of Rajshahi, Rajshahi, 6205, Bangladesh;(2) Department of Physics, University of Warwick, Coventry, CV4 7AL, UK |
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Abstract: | The effect of addition of small amounts of P2O5 in the lithium disilicate glasses results in the scavenging of lithium metal ions by a phosphate group, Li3PO4. As a consequence of the scavenging, the silicate network partially repolymerises. The phosphate group remains intact during heat treatment of the optically clear, X-ray amorphous and slightly nucleated base glasses. However, the relative amounts of the silicate species, Qm (0 ≤ m ≤ 4), are dependent on the state of the glasses. These amounts, in the optically clear and X-ray amorphous, do not change with heat treatment but they do change, i.e. disproportionation occurs in the slightly nucleated and milky coloured glasses. The disproportionation follows the relation 2Q3 → Q2 + Q4 which is evident from the relative intensity of the different peaks. |
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