| http://www.w3.org/ns/prov#value | - As well as the microcrystalline phase, the glassy matrix is therefore also free from divalent or monovalent metals.The glassy matrix preferably consists of halides, especially fluorides, of trivalent and/or tetravalent metals; these trivalent and/or tetravalent metals are advantageously chosen from the group consisting of zirconium, indium, aluminium andgallium.According to the invention the cryst
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