Criteria used to identify Fe^2+-Fe^3+ and Fe^2+-Ti^4+ intervalence charge transfer absorption bands in electronic spectra are reviewed and compared to the characteristics of unperturbed Fe^2+ crystal field bands and those that are intensified by interaction with Fe^3+. Band energy is the least definitive diagnostic criterion. Changes in band intensity with temperature are also of limited value. Large widths are the most reliable characteristic of charge transfer bands. New optical absorption spectra are presented for euclase, as well as 80 K spectra of rockbridgeite, babingtonite and lazulite. Comparison of optical spectra to magnetic susceptibility measurements for rockbridgeite and babingtonite provides support for recent theories regardi...
Optical absorption spectroscopy is an effective method to investigate the local atomic and electron...
All minerals have regions of strong absorption of electromagnetic radiation in the ultraviolet, vis...
Smith G. The temperature variations of proposed single ion, exchange-coupled pair and metal-metal ch...
Many of the geophysical and crystal chemical properties of the Earth rely on the behaviour of the mi...
Optical absorption spectra are presented for taramellite, traskite and neptunite, all of which have ...
The valence and distribution of iron in vivianite, lazulite, babingtonite, rockbridgeite, acmite, ae...
Flux-grown Fe3+ -bearing spinel s.s.-hercynite solid-solution crystals, (Mg1-yFe2+ y)Al2O4 (0 < y...
Four gahnite single crystals with variable colors from pale blue to green have been studied by a mul...
Abst rac t-A preliminary survey of electronic absorption spectra of clay minerals reveals the utilit...
Optical spectra are presented for seven oxygen based, four-coordinated Fe^(2+) bearing minerals, eud...
Optical absorption spectroscopy has the potential to uncover many characteristics of Fe-bearing, red...
typical for that element in an octahedral site, except for the high oscillator strength of the band ...
Through a systematic investigation of the complete dielectric tensor, between 0.5 and 5.0 eV, of Fe3...
The optical absorption spectra of two samples of grossular have been measured at room temperature. A...
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1979.M...
Optical absorption spectroscopy is an effective method to investigate the local atomic and electron...
All minerals have regions of strong absorption of electromagnetic radiation in the ultraviolet, vis...
Smith G. The temperature variations of proposed single ion, exchange-coupled pair and metal-metal ch...
Many of the geophysical and crystal chemical properties of the Earth rely on the behaviour of the mi...
Optical absorption spectra are presented for taramellite, traskite and neptunite, all of which have ...
The valence and distribution of iron in vivianite, lazulite, babingtonite, rockbridgeite, acmite, ae...
Flux-grown Fe3+ -bearing spinel s.s.-hercynite solid-solution crystals, (Mg1-yFe2+ y)Al2O4 (0 < y...
Four gahnite single crystals with variable colors from pale blue to green have been studied by a mul...
Abst rac t-A preliminary survey of electronic absorption spectra of clay minerals reveals the utilit...
Optical spectra are presented for seven oxygen based, four-coordinated Fe^(2+) bearing minerals, eud...
Optical absorption spectroscopy has the potential to uncover many characteristics of Fe-bearing, red...
typical for that element in an octahedral site, except for the high oscillator strength of the band ...
Through a systematic investigation of the complete dielectric tensor, between 0.5 and 5.0 eV, of Fe3...
The optical absorption spectra of two samples of grossular have been measured at room temperature. A...
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1979.M...
Optical absorption spectroscopy is an effective method to investigate the local atomic and electron...
All minerals have regions of strong absorption of electromagnetic radiation in the ultraviolet, vis...
Smith G. The temperature variations of proposed single ion, exchange-coupled pair and metal-metal ch...