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The System Manganese Oxide–Alumina in Air
Author(s) -
RANGANATHAN T.,
MacKEAN B. E.,
MUAN ARNULF
Publication year - 1962
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.1151-2916.1962.tb11144.x
Subject(s) - corundum , solid solution , spinel , tetragonal crystal system , isobaric process , manganese , oxide , chemistry , mineralogy , thermodynamics , inorganic chemistry , materials science , crystal structure , metallurgy , crystallography , physics
The quenching technique has been used to determine equilibrium relations among the various phases in the system manganese oxide‐alumina in air in the temperature range 800° to 1765°C. Three isobaric invariant situations have been determined, as follows: Tetragonal Mn 2 O 3 solid solution, Mn203 solid solution, corundum, and gas (PO 2 = 0.21 atm) coexist in equilibrium at 881°± 5°C. Tetragonal Mn 3 O 4 solid solution, spinel solid solution, corundum, and gas are the phases present together in equilibrium at 990°± 5°C. Spinel solid solution, corundum, liquid, and gas coexist in equilibrium at 1740°± 10°C.