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High‐Temperature Phase Relations in Selected MnO‐CrO x ‐Containing Systems
Author(s) -
GarbersCraig Andrie M.,
Dippenaar Rian J.
Publication year - 1998
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.1151-2916.1998.tb02429.x
Subject(s) - spinel , partial pressure , phase (matter) , atmospheric temperature range , oxygen , analytical chemistry (journal) , materials science , oxygen pressure , mineralogy , chemistry , inorganic chemistry , thermodynamics , metallurgy , physics , organic chemistry , chromatography
Phase relations in the pseudobinary MnO‐CrO x system were studied by the reaction of the individual oxides in the temperature range 1400°‐1750°C under a reducing atmosphere with a CO:CO 2 volume ratio of 4.8, yielding oxygen partial pressures in the range 10 ‐9.98 ‐10 ‐6.97 atm. In the pseudoternary MnO‐CrO x ‐containing systems that constitute the pseudoquaternary MnO‐CrO x ‐CaO‐SiO 2 system, phase relations were determined only at 1500°C under an oxygen partial pressure of 10 −8.99 atm. Characteristic of these MnO‐CrO x ‐containing systems was the dominance of the (Mn,Cr) 3 O 4 spinel phase.