PREPARATION AND STUDY OF CA1-XMGX(PO3)(2) GLASSY AND CRYSTALLINE PHASES

The structure of Ca1-xMgx(PO3)(2) crystalline and glassy samples was i nvestigated in the whole concentration region of x = 0-1.0. From X-ray diffraction data it was found that, in the crystalline samples, solid solutions are formed for x < 0.3 on the calcium-side of the system, w ith the structure of beta-Ca(PO3)(2), and for x > 0.6 on its magnesium -side, with the structure of Mg2P4O12. Similar results were obtained f rom the study of their infrared and Raman spectra. In the glassy state , homogeneous glasses were formed within the whole concentration regio n. The values of their transformation temperatures, T-g, and crystalli zation temperature, T-c, change slightly with the composition and lie within the region of T-g = 529-544 degrees C and T-c = 631-677 degrees C. (C) 1998 Chapman & Hall.