Solubility of SrAl2O4 in CaAl2O4—a high resolution powder diffraction study

The solid solubility of the SrAl2O4–CaAl2O4 system has been investigated using high resolution synchrotron powder diffraction methods. Analysis of the patterns shows there is a limited composition range at which single phase samples can be obtained, x<0.25 and x>0.75 for the series Ca1−xSrxAl2O4. At intermediate compositions up to three phases are observed, two monoclinic and one hexagonal. The temperature dependence of the structures is also described.