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Melting of Forsterite, Monticellite, Merwinite, Spinel, and Periclase Assemblages
Author(s) -
BIGGAR G. M.,
O'HARA M. J.
Publication year - 1970
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1970.tb15959.x
Subject(s) - forsterite , periclase , spinel , magnesite , olivine , mineralogy , mineral , ringwoodite , materials science , metallurgy , geology , magnesium
Experimental data which define melting temperatures and crystalline solution compositions show that the assemblage forsterite+monticellite+spinel+periclase melts near 1425°C and that the assemblage monticellite+merwinite+spinel+ periclase melts between 1406° and 1420°C. The melting of the former assemblage is a double reaction point. The forsterite crystalline solution contains 13 mol% monticellite and the monticellite crystalline solution contains 22 mol% forsterite. A projection system shows that the new data agree with much previous data but highlight inconsistencies in previous data for assemblages containing more CaO, such as merwinite+dicalcium silicate+spinel+periclase. These assemblages are encountered in magnesite refractories with CaO:SiO 2 <2.0 during firing and in service.