Common: Al2O3, B2O3, BaO, C, CaO, CO2, CoO, Cr2O3, Cu2O, CuO, Fe2O3, FeO, H2O, K2O, Li2O, LOI, MgO, MnO, MnO2, Na2O, NiO, O, Organics, P2O5, PbO, SiO2, SnO2, SO3, SO4, SrO, TiO2, V2O5, ZnO, ZrO, ZrO2, Others

P2O5 (Phosphorus Pentoxide)

Family:Flux
Weight:141.900
Expansion:0.000
Fusion:580C

(Sources: Bone Ash, Wood and Plant Ash)

-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.

Properties

  • Fusion - Sublimates at 300C

    From The Oxide Handbook

  • Surface Modifier - Variegation

    Phosphorus can produce variegated and mottling effects in glazes (especially low fire) when used in small amounts (e.g. up to 2%). Bone ash is a source.

Authors

  • Tony Hansen (Owner)

Others: Ag2O, As2O3, As4O6, Au2O3, BeO, Bi2O3, CdO, CeO2, Cl, Cs2O, CuCO3, Dy2O3, Er2O3, Eu2O3, F, Fr2O, Free SiO2, Ga2O3, GdO3, GeO2, HfO2, HgO, Ho2O3, In2O3, IrO2, KNaO, La2O3, Lu2O3, Mn2O3, MoO3, N2O5, Nb2O5, Nd2O3, Ni2O3, OsO2, Pa2O5, PdO, PmO3, PO4, Pr2O3, PrO2, PtO2, RaO, Rb2O, Re2O7, RhO3, RuO2, Sb2O3, Sb2O5, Sc2O3, Se, Sm2O3, Ta2O5, Tb2O3, Tc2O7, ThO2, Tl2O, Tm2O3, Trace, U3O8, UO2, WO3, Y2O3, Yb2O3,



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