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Phase Equilibria in the Mn – V – O System Near MnO – V 2 O 3 Isopleth
Author(s) -
Kim MinSu,
Kang YounBae,
Cha WooYeol,
Lee HaeGeon
Publication year - 2012
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.1551-2916.2012.05193.x
Subject(s) - chemistry , phase (matter) , solidus , analytical chemistry (journal) , chromatography , organic chemistry , alloy
Phase equilibria in the Mn – V – O system near MnO – V 2 O 3 isopleth has been investigated in the temperature range from 1200°C to 1600°C and in the range of oxygen partial pressure from ∼10 −6 to ∼10 −13 atm. High‐temperature equilibration, quenching and electron probe microanalysis were employed to obtain equilibrium compositions of liquid and several solid solutions. XRD analysis was also employed to confirm the stable phases. The phases which have been observed are; liquid oxide, ( MnO ) s.s. , ( V 2 O 3 ) s.s. , and ( Mn V 2 O 4 ) s.s. . The ( Mn V 2 O 4 ) s.s. phase was confirmed to be the only intermediate phase near the MnO – V 2 O 3 isopleth under the conditions in the present study. It was found that sub‐solidus phase equilibria are considerably affected by the oxygen partial pressure. From the effect of oxygen partial pressure on the sub–solidus phase equilibria, the structures ( Mn 2+ , V 2+ ) T ( Mn 2+ , Mn 3+ , Mn 4+ , V 3+ , Va )2 − xOO 4 , ( V 3+ , Mn 3+ , V 4+ ) 2 O 3+ y and ( Mn 2+ , Mn 3+ , V 2+ ) 1− z O are proposed for Mn V 2 O 4 , V 2 O 3 , and MnO solid solutions, respectively.