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| | Fluorapatite (Ca5F(PO4)3) Basic information |
| | Fluorapatite (Ca5F(PO4)3) Chemical Properties |
| density | 3.205 g/cm3 | | form | Chips | | color | Colorless | | Water Solubility | Soluble in water and hydrochloric acid. |
| | Fluorapatite (Ca5F(PO4)3) Usage And Synthesis |
| Description | This apatite is formed by the same methods as the
calcium apatite analog. The solid-state reaction required is:
6SrHPO4 + 3SrCO3 + SrF2 + heatSr10F2(PO4)6
+ 3CO2 + 3H2O
It has also been prepared by the solution method:
10SrF2 (aq) + 6Na3PO4 (aq)Sr10(F)2(PO4)6 (solid)
+ 18NaF (aq) + 2HCl
However, the product is contaminated by Na+ ions
and must be washed thoroughly to obtain a pure product.
A small amount of hydroxyapatite may also be present.
Strontium fluorapatite has been shown to be one of
the best hosts for Nd3+ doping among apatite crystals.
Neodymium-doped strontium fluorapatite crystal has
been grown by the Czochralski method. The data of
thermal expansion and specific heat of the crystal have
been measured. The thermal expansion coefficients
along X and Z direction are a1 =11.4×10-6/K and
a3 = 12.3×10-6/K, respectively. The specific heat is
110 cal/mol K at 330 K. The measured absorption
spectra from 400 to 850 nm showed that the crystal has
absorption peaks around 805.5 nm, and the absorption
coefficients at 805.5 nm are 16.05/cm and 5.59/cm for
p and a-polarization, respectively.
Strontium fluoroapatite does not have a CAS number
even though it is still used as a phosphor for compact
and standard fluorescent lamps. It has been the subject
of numerous academic studies but has found little or
no usage in industry except those already mentioned. | | Chemical Properties | fluoroapatite is a mineral for fluorine; can be prepared from CaCl2 and sodium monofluorophosphate; used as a laser crystal(s), may have the lowest energy threshold of any crystal(s) at room temp [KIR78] [HAW93] | | Uses | Apatite is one of a few minerals produced and used by biological micro-environmental systems. The primary use of apatite is in the manufacture of fertilizer, it is a source of phosphorus. It is occasionally used as a gemstone. Green and blue varieties in finely divided form, are pigments with excellent covering power. |
| | Fluorapatite (Ca5F(PO4)3) Preparation Products And Raw materials |
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