Published October 1981
| public
Journal Article
Origin of the Yellow Color of Complex Nickel Oxides
Abstract
Single-crystal optical absorption spectra of NiO, NiTiO_3, NiWO_4, NiV_2O_6, NiNb_2O_6, Ni_2SiO_4, Ni_3V_2O_8, LiNiPO_4, Li_2Ni_2MO_3O_(12), SrNiTeO_6, LiScSiO_4:Ni, MgSiO_3:Ni, and (Mg,Ni)_2SiO_4 are presented for the purpose of comparing the spectra of yellow and green Ni^(2+) compounds. Powder spectra of NiTiO_3, NiWO_4, NiV_2O_6, NiNb_2O_6, and Ni_3V_2O_8 in the ultraviolet region help elucidate the more intense charge transfer bands. Bright yellow color results when Ni^(2+) is in a six-coordinated site significantly distorted from octahedral symmetry. Increased absorption intensity occurs when the metal ion d-d bands are in proximity to an ultraviolet charge transfer band.
Additional Information
© 1981 by Academic Press, Inc. Received January 30, 1981; in revised form April 20, 1981. Jun Ito, University of Chicago, provided the nickel silicates and their chemical analyses for this study. Jeff Hare and Don S. Goldman assisted with some of the optical measurements. We also acknowledge B. F. Gordon for sample preparation, C. M. Foris and E. P. Moore for assistance in X-ray diffraction, and J. J. O'Reilly for assistance in the diffuse reflectance measurements.Additional details
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- CaltechAUTHORS:20130503-105954916
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- Division of Geological and Planetary Sciences