| 摘要 |
The invention relates to a glass or glass-ceramic precursor having a grain to grain homogeneity and at least one component of which exists in a crosslinked form. This precursor can be obtained by a process in which a sol of one of the constituent components and a salt of the other remaining component(s) are brought together, the suspension thus obtained is dried and the product resulting from the drying is calcined. <IMAGE>
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