Formation of Borophosphate Glass Structure Within the System BaO--B sub 2 O sub 3 --P sub 2 O sub 5

Formation of Borophosphate Glass Structure Within the System BaO--B sub 2 O sub 3 --P sub 2 O sub 5

Formation of distinct crystalline phases during glass synthesis in the system BaO--B sub 2 O sub 3 --xP sub 2 O sub 5 (x = 0-60 mol%) has been predicted thermodynamically and verified by means of measured Raman spectra. The initial reaction temperature is reduced by 200-300 deg C on addition of P su...

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Veröffentlicht in:Journal of non-crystalline solids 1990-07, Vol.129 (1-3), p.284-291
Hauptverfasser: Sedmale, G, Vaivads, J, Sedmalis, U, Kabanov, V O, Yanush, O V
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container_title Journal of non-crystalline solids
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creator Sedmale, G
Vaivads, J
Sedmalis, U
Kabanov, V O
Yanush, O V
description Formation of distinct crystalline phases during glass synthesis in the system BaO--B sub 2 O sub 3 --xP sub 2 O sub 5 (x = 0-60 mol%) has been predicted thermodynamically and verified by means of measured Raman spectra. The initial reaction temperature is reduced by 200-300 deg C on addition of P sub 2 O sub 5 to BaO--B sub 2 O sub 3 with the primary reaction product being BPO sub 4 . In addition, both borate and phosphate compounds including BaO.B sub 2 O sub 3 , BaO.4B sub 2 O sub 3 , 3BaO.P sub 2 O sub 5 and 2BaO.P sub 2 O sub 5 have been identified in compositions containing up to 33 mol% P sub 2 O sub 5 . Raman spectra reveal the appearance of orthophosphate groups and compositions analogous to the compound 2BaO.B sub 2 O sub 3 .P sub 2 O sub 5 . All binary compounds were observed in mixtures having a P sub 2 O sub 5 content between 30-33 mol%; associated Raman spectra exhibit marked line broadening. At higher phosphate compositions meta- and ultra-phosphate phases could be identified from measured spectra. Graphs, Phase diagrams, Spectra. 33 ref.--AA
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title Formation of Borophosphate Glass Structure Within the System BaO--B sub 2 O sub 3 --P sub 2 O sub 5
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