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Phase Equilibria in the Iron Oxide‐Cobalt Oxide‐Phosphorus Oxide System
Author(s) -
GUIRE MARK R.,
PRASANNA T. R. S.,
KALONJI GRETCHEN,
O'HANDLEY ROBERT C.
Publication year - 1987
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.1151-2916.1987.tb05636.x
Subject(s) - liquidus , cobalt , oxide , cobalt oxide , ternary numeral system , chemistry , inorganic chemistry , iron phosphate , ternary operation , phosphate , iron oxide , metallurgy , phase (matter) , materials science , organic chemistry , computer science , programming language
Solid‐state equilibria at 1000°C were determined in the Fe 2 O 3 ‐FePO 4 ‐Co 3 (PO 4 ) 2 ‐CoO area of the Fe‐Co‐P‐O system in air. Two new ternary compounds were observed: CoFe(PO 4 )O, an oxyphosphate which melts incongruently at 1130°C, and Co 3 Fe 4 (PO 4 ) 6 , an orthophosphate which melts incongruently at 1080°C. The ramifications of the liquidus behavior for the formation of rapidly solidified cobalt ferrite from cobalt ferrite‐phosphate melts are discussed.