Strontium Chloroapatite

Description

Strontium Chloroapatite is prepared by the solid-state reaction of:
6SrHPO4 + 3SrCO3 + SrCl2 + heat?Sr10Cl2(PO4)6 + 3CO2 + 3H2O
It has the molecular weight of 1516.7183 g/mol. It is hexagonal, as expected, with a = 9.859?° and c = 7.205?. The general features of the structure are the same as the fluoroapatite or hydroxyapatite except the Cl^- atoms are at the (0,0,1/2) point along the c-axis between the two Sr triangles on the mirror planes at z = 1/4 and z = 3/4. This structure is almost identically the same as the calcium analog.

The Uses of Strontium Chloroapatite

The major use of strontium chloroapatite has been as a matrix for forming “SCAP” which is a phosphor having the formula of Sr5Cl(PO4)3: Eu²⁺ in which the divalent europium activator emits a blue band peaking at 450 nm. It is used extensively in “Tri-Color” fluorescent lamps. This phosphor is imported from Japan and China.