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Optical Spectra of Synthetic Spinels in the System MgAl 2 O 4 –MgCr 2 O 4
Author(s) -
Ikeda Ko,
Nakamura Yoshinori,
Masumoto Kiyoshi,
Shima Hiromi
Publication year - 1997
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.1151-2916.1997.tb03170.x
Subject(s) - spinel , octahedron , chromium , ion , spectral line , crystallography , local symmetry , reflection (computer programming) , crystal (programming language) , symmetry (geometry) , solid solution , chemistry , crystal structure , materials science , physics , metallurgy , geometry , mathematics , organic chemistry , quantum mechanics , astronomy , computer science , programming language
Unpolarized optical spectra were measured in the wavelength range 322–1666 nm by the diffuse reflection technique from spinel powders synthesized in the system MgAl 2 O 4 –MgCr 2 O 4 . The spectra were interpreted by the crystal‐field theory on the basis of trigonally distorted spinel octahedra with D 3d symmetry. For chromium‐rich solid solutions, including the MgCr 2 O 4 end‐member, results after peak fittings showed octahedral D 3d local symmetry around Cr 3+ ions, identical to the crystallographic site symmetry. For chromium‐poor solid solutions, however, octahedral C 3v local symmetry was suggested around Cr 3+ ions, different from the D 3d crystallographically expected.