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EXAFS Study of Cation Distribution in Nickel Aluminate Ferrites
Author(s) -
Yao Takeshi,
Imafuji Osamu,
Jinno Hiroshi
Publication year - 1991
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.1151-2916.1991.tb06881.x
Subject(s) - spinel , aluminate , extended x ray absorption fine structure , nickel , ion , octahedron , materials science , transition metal , analytical chemistry (journal) , absorption (acoustics) , crystallography , crystal structure , inorganic chemistry , chemistry , absorption spectroscopy , metallurgy , catalysis , biochemistry , physics , organic chemistry , chromatography , quantum mechanics , cement , composite material
A new method for analyzing the cation distribution of spinel crystals by extended X‐ray absorption fine‐structure spectroscopy has been developed to overcome the disadvantage of X‐ray diffraction, which cannot readily distinguish among different transition‐metal ions. EXAFS analysis was conducted on Ni 2+ and Fe 3+ ions in nickel aluminate ferrites, and the cation distributions obtained were in good agreement with values obtained by other methods. The ratio of tetrahedral sites occupied by Ni 2+ ions decreases with increasing iron content. Fe 3+ ions distribute nearly equally to both tetrahedral and octahedral sites. Apparently, not only crystal‐field stabilization energy but also ion size affects cation distribution.