Chromium phosphate extra pure
Description
Chromium phosphate extra pure refers to high-purity chromium(III) phosphate (CrPO₄), an inorganic compound appearing as green or blue orthorhombic crystals or powder. It has a molecular weight of 146.97 g/mol, density of 4.236 g/cm³ (or ~2.12 g/mL at 25°C), and decomposes at 120-140°C without melting. The 'extra pure' grade ensures minimal impurities for analytical and laboratory applications, with low solubility in water and acids.
Structurally, it features infinite chains of edge-sharing CrO₆ octahedra linked by PO₄ tetrahedra in its β-isoform (orthorhombic Cmcm space group), transitioning to α-CrPO₄ above 1175°C. Hydrated forms like CrPO₄·6H₂O (violet) exist, prepared by reducing Cr(VI) compounds with hydrazine or ethanol in phosphoric acid.
It exhibits antiferromagnetic properties at low temperatures and acts as a cation exchanger. Used in ceramics, pigments, and as a catalyst precursor, it is irritant and requires protective handling due to chromium toxicity.
Specifications
| Model No. | N-CH1585 |
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