Abstract
Recent studies on the crystallization of a glass in the system of Na2O-CaO-P2O5-SiO2 have revealed an unknown phase. The lattice parameters were claculated from the XRD analysis; they were in agreement with the result of TEM diffraction patterns. From the evidence of TEM, EPMA, XRD and SEM analysis, the phase have been identified as (Na0.11, Ca0.89) (P0.11, Si0.89)O3 with a P1 structure and have an isomorphic with CaSiO3. Transition phase appeared in crystallization process was to be described; and substitutional conditions between the atoms of unknown phase were also discussed in the article.
