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Determination of Chromium Oxidation States in Part of the System CaO─3CaO · Cr 2 O 3 in Air
Author(s) -
Mirtič Breda,
Fajgelj Aleš,
Lutar Karel,
Schara Milan,
Kaučič Venčeslav
Publication year - 1992
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.1151-2916.1992.tb04481.x
Subject(s) - chromium , electron paramagnetic resonance , paramagnetism , scanning electron microscope , analytical chemistry (journal) , calcium oxide , oxide , magnetic susceptibility , neutron diffraction , materials science , chemistry , mineralogy , nuclear chemistry , inorganic chemistry , crystal structure , crystallography , nuclear magnetic resonance , metallurgy , physics , composite material , quantum mechanics , chromatography
The aim of the present work was to identify the structural characteristics of calcium chromium oxide formed at molar ratios CaO/Cr 2 O 3 ≥ 3/1 and at elevated temperatures by the use of nondestructive techniques: instrumental neutron activation analysis (for determination of the total chromium content), electron paramagnetic resonance, magnetic susceptibility (for determination of chromium oxidation states), X‐ray diffraction, and scanning electron microscopy. Our results suggest formation of the 3CaO · Cr 2 O 5 compound, while at larger molar ratios only a small portion of Cr is incorporated into the crystalline CaO lattice as paramagnetic Cr 3+ .