Barium metaphosphate Ba(PO3)2 – optical grade 99.99%
The combination of sodium and barium polyphosphate forms a low-melting glass with a high coefficient of thermal expansion. The melting point of the glass increases with barium content. This glass makes seals with low melting metals like aluminium (melting point 650 °C). Normal borosilicate glasses soften above the melting point of aluminium. This mixture is prepared by heating a mixture of diammonium phosphate, sodium carbonate, and barium carbonate.
| IUPAC name
barium(2+); dioxido(oxo)phosphanium
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| Identifiers | |
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| ECHA InfoCard | 100.033.951 |
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| Ba(PO3)2 | |
| Molar mass | 295.27 g/mol |
| Appearance | Powder |
| Density | 3.63 g/cm3 |
| Melting point | 1,560 °C (2,840 °F; 1,830 K) |
