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Influence of Oxygen Partial Pressure on the Quasi‐Ternary System Cr─Mn─Ti Oxide
Author(s) -
GarcíaRosales Carmen,
Schulze Horst A.,
Naoumidis Aristides,
Nickel Hubertus
Publication year - 1993
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.1151-2916.1993.tb04029.x
Subject(s) - partial pressure , spinel , oxygen , bar (unit) , ternary operation , materials science , manganese , oxide , chromium , partial oxidation , ternary numeral system , analytical chemistry (journal) , phase (matter) , titanium , solid solution , mineralogy , chemistry , metallurgy , geology , oceanography , organic chemistry , chromatography , computer science , programming language
The quasi‐ternary system Cr─Mn─Ti oxide was investigated at 1000°C under oxygen partial pressures ranging from 0.21 bar to 10 ‐21 bar (1 bar = 10 5 Pa). X‐ray diffraction analysis was used to identify phases and determine lattice parameters. The positions of phase boundaries as a function of oxygen partial pressure were measured using the emf method. The spinel MnCr 2 O 4 may be regarded as the most interesting compound in this system. Part of the chromium can be replaced by trivalent titanium at low oxygen partial pressures and by trivalent manganese at high pressures, and the formation of a limited solid solution with the spinel Mn 2 TiO 4 is possible in all cases. As a result, a coherent single‐phase spinel region exists over the entire oxygen partial pressure range at 1000°C.