Disproportionation of Qm (0 ≤ m ≤ 4) species in partially devitrified Li2Si2O5 glasses with small amounts of P2O5
| Autor: | Ray Dupree, M. R. Ahsan, Diane Holland, M. G. Mortuza |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Base (chemistry) Mechanical Engineering Inorganic chemistry Disproportionation Phosphate Silicate Amorphous solid law.invention chemistry.chemical_compound chemistry Mechanics of Materials law General Materials Science Phosphorus-31 NMR spectroscopy Crystallization Scavenging |
| Zdroj: | Journal of Materials Science. 42:7950-7955 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-006-1398-4 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|