Aluminium Metaphosphate

Product name : Aluminium Metaphosphate
Molecular formula: AI (PO3) 3 
Molecular weight: 263.90
PRODUCT PROPERTIES:
Glass powder, insoluble in water, PH value: 2.4, refractive index: 1.545
APPLICATION:
Mainly used in special optical glass, phosphate glass, fluorophosphate glass and laser fusion glass additives, aluminum metaphosphate in fluorophosphate glass than other metaphosphate better moisture resistance and lower refractive index, Abbe number is also large, so that the UV part of the glass is relatively low, chemical stability and mechanical strength is high. Its chemical stability is three orders of magnitude higher than that of zirconium fluoride based glass. For metaphosphate glass with aluminum metaphosphate content less than (≤5% molar fraction), the glass network structure is seriously damaged. In fluorophosphate glass with RF and RF2, Al+ 3,Mg+2,Li+ 1 can form [MgF4], [AIF4] and [LiF4] tetrahedral reconnection broken bonds. In order to improve the chemical stability of the glass, [AI+ 3,Mg+2,Li+1] cations with high field strength Other cations can also be filled between short chains, and in the production, through the electrostatic attraction of fluorine ions or oxygen ions to agglomerate short and conducive to inhibit the glass loss, when aluminum metaphosphate is added more than ≥85%, the structure of the glass is seriously damaged. Fluorophosphate glass in the actual production of broken crystals, the way to solve: 1, the addition of YbF3 can play a role in the formation of the network, improve the stability of the amorphous glass, because phosphate glass is O+2 and F- coordination, F- radius is small, and rare earth ions in oxophosphate glass coordination number is larger, rare earth ions in fluorophosphate glass - generally network intermediates, can be located in the network structure, It can also be located outside the network structure, and the distribution is more uniform in the glass system, and the concentration extinction effect is relatively not easy to occur. The introduction of Yb+3 effectively reduces the damage degree of F- to the P-O bond based chain structure in the glass. The amount introduced in the glass system (5-35%). Data for reference.
CHEMICAL PARAMETERS:

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