Mössbauer and Reflectance Spectroscopy of Iron Oxide Mixtures
نویسندگان
چکیده
which is a mixture of Fht:Mag:Mht in a 40:40:20 ratio. The red line is the fit envelope, the sum of all modeled peaks. Figure 1. VNIR reflectance spectra of FeOx mixtures. MÖSSBAUER AND REFLECTANCE SPECTROSCOPY OF IRON OXIDE MIXTURES. M. D. Dyar, E. Murad, E. C. Sklute, J. L. Bishop, and A. C. Muirhead, Dept. of Astronomy, Mount Holyoke College, South Hadley, MA, 01075, ([email protected]), 2Marktredwitz, D‐95615, Germany ([email protected]), Dept. of Chemistry, Penn State University, State College, PA 16802, ([email protected]), SETI Institute/NASAARC, Mountain View, CA, 94043, ([email protected]), UCSC, Santa Cruz, CA, 95064, ([email protected]).
منابع مشابه
Mössbauer and Magnetic Studies of Iron-Zeolite and Iron-Cobalt Zeolite Catalysts Used in Synthesis Gas Conversion
Medium-pore (diameter ~ 6A) zeolites such as ZSM-5 and silicalite impregnated with Group VIII metals provide selective catalytic pathways for the conversion of synthesis gas to gasoline or olefins. Mössbauer and magnetic studies on these catalysts containing iron or iron plus cobalt are reported. The zeolites were impregnated with metal nitrate solutions, reduced, and carbided to yield showed F...
متن کاملInfluence of Urotropin on the Precipitation of Iron Oxides from FeCl3 Solutions
Precipitations of iron oxides from FeCl3 solutions in the presence of urotropin at 90 oC were monitored using the Fourier transform infrared spectroscopy, Mössbauer spectroscopy, X-ray diffraction and transmission electron microscopy. Urotropin was used as a generator of OH– ions. The precipitation processes depended on the concentrations of FeCl3 and urotropin and the time of aging. After 1 da...
متن کاملComparative study of iron oxide nanoparticles as-prepared and dispersed in Copaiba oil using Mössbauer spectroscopy with low and high velocity resolution.
Iron oxide nanoparticles, probably magnetite, as-prepared and dispersed in Copaiba oil were studied by Mössbauer spectroscopy using two different spectrometers: with a low velocity resolution (512 channels) for measurements at 295 and 21K and with a high velocity resolution (4096 channels) for measurements at 295 and 90K. The fitting of all measured spectra demonstrated that usual models applie...
متن کاملThe Vnir Spectral Properties of Iron Oxide/oxyhydroxide Mixtures and Applications to Iron Oxides in the Mawrth Vallis Region of Mars
Introduction: Iron oxides/oxyhydroxides (FeOx) are present nearly everywhere on the surface of Mars [e.g. 1,2]. They are characterized in the visible/near-infrared (VNIR) region by a strong electronic absorption centered near 0.85-0.95 μm and additional absorptions that shape the character of the visible reflectance spectrum and their color [3,4]. The objective of this study is to measure the s...
متن کاملLow temperature aqueous alteration of basalt: Mineral assemblages of Deccan basalts and implications for Mars
[1] Al-rich phyllosilicates (kaolinite, montmorillonite) have been found in layers overlying Fe/Mg-smectites on Mars, and it has been suggested that this stratigraphy formed through in situ leaching at the surface, similar to terrestrial weathering profiles. We are investigating the remotely sensed signatures of this type of weathering using ten samples from a vertical section of altered Deccan...
متن کامل