Ca_3(PO_4)_2-MgSiO_3系の相関係

概要

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Phase relations in the system tricalcium phosphate (3CaO・P_2O_5 = C_3P)-enstatite (MgO・SiO_2=MS) have been investigated in the temperature range 1100 to 1600℃ by means of the quenching method. C_3P takes β-type (whitrockite) in a wide region by dissolution of MgO, and diopside (d) appeared in the composition range more than 40 mass% C_3P by a reach in between MgSiO_3 and liberated CaO. The enstatite transfers to iron-free pigeonite (pi) by taking CaO in an MS-rich region, where pi coexists with protoenstatite, MgSiO_3 (pr). Primary crystals which appeared in a wide region are β-C_3P and pi, and primary diopside appears in a narrow region at a minimum temperature (1265-1305℃). In the subsolidus region below 1245℃, β-C_3P coexists with d, pi or pi-pr mixture. The system is not binary and it should be discussed from the ternary system C_3P-M-S and the quaternary system C_3P-CMS_2-MS-S.
社団法人日本セラミックス協会の論文
1996-06-01