FORMATION OF SRSO4-CENTER-DOT-1 2H2O IN AN SRSO4-H2O SYSTEM AND ITS SOLID-SOLUTION IN A CASO4-SRSO4-H2O SYSTEM/

In an SrSO4-H2O system the formation of a new compound of SrSO4.1/2H2O has been found by coprecipitation from solutions of Sr2+ and SO42-. T his was found to have a similar crystal structure to CaSO4.1/2H2O Of a hexagonal crystal system. The lattice constants thereof were calculat ed. It was also found that SrSO4.1/2H2O is not stable in water, but ch anges to a stable well-known orthorhombic anhydrous strontium sulfate. For a CaSO4-SrSO4-H2O system, a series of solid solutions of CaSO4.1/ 2H2O and SrSO4.1/2H2O was prepared, which had similar X-ray diffractio n patterns to SrSO4.1/2H2O. These solid solutions were unstable in wat er, and converted with time to a mixture of stable anhydrous SrSO4 and CaSO4.2H2O.