P2O5 (Phosphorus Pentoxide)| Family | Glass |
| Weight | 141.900 |
| MLPT - Melting Point (MP) |
Sublimates at 300C (From The Oxide Handbook) |
Notes-Phosphorus along with calcium is an essential element in plant and animal growth, thus its principal source is organic ash (i.e. calcined cattle bones).
-Phosphoric oxide is normally present in only trace amounts in ceramic materials.
-It can act as a melter in middle to high fire, but its power per unit added drops drastically beyond 5% additions.
-Small amounts can produce colloidal opacity as in Chinese chun glazes. The depth of Sung glazes is attributed to phosphorus.
-P2O5 is a glass network former like boric oxide and silicon dioxide. Phosphoric glass tends to show as a bluish flush in glazes. It is not in any way a substitute for silica and does not enter the silica chain, but remains as a separate colloidal presence in the silicate matrix.
-Phosphorus can vitrify porcelains without softening and is the key to translucency in bone china.
-Phosphate ions are added to glaze frits as a color control agent during the melting of titania opacified frits.
-P2O5 is known to influence the rate of nucleation and/or crystallization in Li2O and MgO low expansion glaze systems.
-P2O5 combines with certain oxides of iron forms colorless compounds. This suggests that P2O5 could be used to allow the use of less pure materials in glazes and glass.
-Phosphorite mineral Ca3(PO4)2 and Apatite 3Ca3(PO4)2 Ca(Cl,F)2 are the parent rocks of phosphate fertilizers. The latter can thus be used to introduce phosphorus into glazes and frits.
Mechanisms
Out Bound Links
- (Materials - Material source)
Bone Ash - Ca5(OH)(PO4)3
Calcium Phosphate
- (Materials - Material source)
Tricalcium Phosphate - Ca3(PO4)2 or 3CaO.P2O5
Tri-Calcium Phos, Tribasic Calcium Phosphate, Synthetic Bone Ash, Calcium Orthophosphate
- (Materials - Material source)
Sodium Tripolyphosphate - Na5P3O10
Sodium Triphosphate
- (Materials - Material source)
Trisodium Phosphate - Na3PO4 - Anhydrous Trisodium Phosphate
TSP
- (Materials - Material source)
Tetrasodium Pyrophosphate Hydrated - Na4P2O7.10H2O - Powerful deflocculant
- (Materials - Material source)
Borax Decahydrate - Na2B4O7.10H2O
Sodium TetraBorate Decahydrate, Borax 10-hydrate, 10 Mol Borax, Neobor
- (Materials - Material source)
Apatite - Ca5(PO4)3(OH, F, Cl) - Calcium Phosphate
- (Materials - Material source)
Hommel Frit 435
- (Materials - Closest material equivalent)
Phosphorus pentoxide - P2O5
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