Other grades of this product :
| BARIUM METAPHOSPHATE Basic information |
| BARIUM METAPHOSPHATE Chemical Properties |
| Melting point | 1560 °C (lit.) | | solubility | H2O: insoluble(lit.) | | form | Powder | | Water Solubility | Insoluble in water. Soluble in acids by a slow dissolution | | CAS DataBase Reference | 13762-83-9 |
| Hazard Codes | Xn | | Risk Statements | 20/22 | | Safety Statements | 28 | | RIDADR | UN 1564 6.1/PG 3 | | WGK Germany | 1 | | F | 3 | | HazardClass | 6.1 | | PackingGroup | III |
| BARIUM METAPHOSPHATE Usage And Synthesis |
| Chemical Properties | White powder. Slowly soluble in acids; insoluble in water. | | Uses | Glasses, porcelains, and enamels. | | Uses | Barium metaphosphate, used in glasses, porcelains, and enamels, as a flame retardant and in phosphors applications. | | Preparation | Barium metaphosphate can be prepared by the solidstate
reaction of metaphosphoric acid and the
hydroxide, oxide or carbonate of barium:
BaCO3 + HPO3 + heat ? Ba(PO3)2 +H2O + CO2
The best temperature to use is about 700°C. It has the
CAS number of 13762-83-9 and the molecular weight of
295.2709 g/mol. If diammonium phosphate is used
instead of solid metaphosphoric acid, the product is
not pure. Colored glasses are obtained caused by the
reduction of P-atoms in the phosphate anion by
hydrogen released from NH3 to form colloidal dispersions
of P4 which produce various colors in the glass.
b-Ba(PO3)2 is the final product. This compound can
also be prepared by the aqueous reactions:
NaPO3 (aq) + BaCl2 (aq) ? Ba(PO3)2 (solid) + NaCl (aq)
or
Ba(OH)2 (solid) + 2HPO3 (aq) ? Ba(PO3)2 (solid)
+ 2H2O
The dissolution and reaction involving HPO3 are
slow and should be carried out in a hot solution. Evaporation
at a low temperature (<15°C) serves to form the
crystals. The product involves several hydrates depending
upon the conditions of precipitation. Anhydrous
barium metaphosphate is a white porous powder or
granular material that is insoluble in water. |
| BARIUM METAPHOSPHATE Preparation Products And Raw materials |
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