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Phase Equilibria in the Systems NiO‐Cr 2 ,O 3 ,‐O 2 , MgO‐Cr 2 O 3 −O 2 , and CdO‐Cr 2 ,O 3 ,‐O 2 , at High Oxygen Pressures
Author(s) -
MULLER OLAF,
ROY RUSTUM,
WHITE WILLIAM B.
Publication year - 1968
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.1151-2916.1968.tb15930.x
Subject(s) - non blocking i/o , spinel , nichrome , monoclinic crystal system , chromium , phase (matter) , chemistry , nickel , crystallography , materials science , analytical chemistry (journal) , inorganic chemistry , crystal structure , metallurgy , biochemistry , organic chemistry , chromatography , catalysis
Phase equilibria were determined for the systems NiO‐Cr 2 O 3 −O 2 , MgO‐Cr 2 O 3 ,‐O 2 , and CdO‐Cr 2 O 3 −O 2 from 450° to above 850° C and at oxygen pressures of from 2 to 3500 atm. Only two intermediate phases were found in the nickel system: NiCrO., (CrVO 4 structure) and the spinel NiCr 2 O 4 . The magnesium and cadmium systems are similar in that they have three analogous phases: the low‐temperature α‐MgCrO 4 and α‐CdCrO 4 (both with the CrVO 4 structure), the high‐temperature β‐MgCrO 4 and β‐CdCrO 4 (both with the α‐MnMoO 4 structure), and the spinels MgCr 2 O 4 and CdCr 2 O 4 . The cadmium system contains an additional phase, Cd 2 CrO 5 , which is primitive monoclinic.