Phase stability study on the remelting reaction in Ca2SiO4 solid solutions

A pseudobinary phase equilibrium diagram has been established for the P2O5-bearing Ca2SiO4-CaFe4O7 system to confirm the occurrence of remelting reaction in alpha-Ca2SiO4 solid solutions (C2S(ss)). The reaction started at 1290 degrees C immediately after the alpha-to-alpha(H)' transition and finished at 1145 degrees C. The reaction products mere made up of about 1 wt% of liquid and 99 wt% of solid alpha(H)'-C2S(ss). The liquid exsolved at 1290 degrees C was rich in Fe2O3, consisting of about 30 wt% of Ca2SiO4 and 70 wt% of CaFe4O7. The liquid coexisting with alpha-C2S(ss) precipitated new alpha'-phase crystals in association with the remelting reaction.