| Abstract: | Cristalline Chromium(III) Phosphate Hexahydrate On precipitation of chromium (III) phosphate from a cold water solution, two further crystalline modifications of the previously described CrPO4 · 6 H2O with the same composition are obtainable. The three phases can be characterized by means of their X-ray diffraction patterns. The least stable of the three forms (γ-CrPO4 · 6H2O) is isomorphous with the corresponding hydrate of the chromium(III) arsenate and forms cubic crystals with a0 = 9.42 Å and 4 molecules in the unit cell. A structural explanation can be given for the most stable of the phases (α-CrPO4 · 6 H2O) which forms monoclinic crystals for the space group Cc with eight molecules in the unit cell and the dimensions a0 = 9.87, b0 6.89, c0 = 23.49 Å and β = 99.4· |
