Phase analysis and crystallographic properties of the phosphate systems MO-ZrO2-P2O5 (M=Mg, Ca, Sr or Ba)

Phase formation in the systems MO-ZrO2-P2O5 (M=Mg, Ca, Sr or Pa) with vario us ratios of M to Zr cations and within the temperature interval from 20 to 1200 degrees C was investigated by means of DTA, TG, XRD and IR spectrosco py. The orthophosphate phases M0.5xZr2.25-0.25x(PO4)(3) with x=0-1, 3 and 7 were synthesized. Concentration and temperature limits of phase existence were found for phosphates belonging in the NaZr2(PO4)(3) structural family. They exist within the regions with M to Zr ratios of 0 less than or equal to x less than or equal to 1 (with the exception of the Mg phases) and in t he temperature interval from room temperature to 900-1700 degrees C.