| Popis: |
Portions of an Al2O3·3H2OH3PO4CaO compositional triangle were examined at 300°C for a solid solution of Ca (presumably in the form of Ca(H2PO4)2) in the Cristobalite AlPO4 crystal structure. X-ray diffraction patterns of the various compositions showed the existence of such a solid solution including a lattice parameter change. The limit of the solid solution was approximated at composition 2CaO, Al2O3·3H2O, 6H3PO4. This solid solution, however, proved to be unstable at 800°C, but was stabilized by the addition of 1 4 mole ZnO at the limit composition. Three points in an Al2O3·3H2OH3PO4ZnO compositional triangle were also examined and evidence of solid solution found including a lattice parameter change. |
