搜索结果: 16-25 共查到“地质学 Nontronite”相关记录25条 . 查询时间(0.062 秒)
Intervalence Electron Transfer and Magnetic Exchange in Reduced Nontronite
Intervalence electron transfer Iron Magnetic susceptibility Nontronite Reduction UV-visible spectroscopy
2012/1/11
The effects of chemical reduction of structural Fe3+ in nontronite SWa-1 (ferruginous smectite) on intervalence electron transfer (IT) and magnetic exchange were investigated. Visible absorption spect...
Interpretation of Mossbauer Spectra of Nontronite, Celadonite, and Glauconite
Atomic coordinates Celadonite Electric field gradient Glauconite Mossbauer spectroscopy Nontronite
2012/1/11
A new approach to the interpretation of Mössbauer spectra of Fe3+-phyllosilicates having vacant trans-octahedra is based on (1) crystal structure simulation methods that allow for the size and th...
Role of Structural Hydrogen in the Reduction and Reoxidation of Iron in Nontronite
Hydrogen Nontronite Oxidation Reduction Structural sites Tritium
2012/2/2
The effects of reduction and reoxidation of octahedral Fe3+ on the exchange of structural hydrogen in nontronite were determined using tritium (3H) as a label element. The uptake of H from the surroun...
Iron Sites in Nontronite and the Effect of Interlayer Cations From Mossbauer Spectra
Interlayer cation Iron Mossbauer spectroscopy Nontronite Octahedral site
2011/11/25
Abstract: The 57Fe Mössbauer spectra of untreated, Ca- and K-saturated nontronite from Garfield, Washington, were measured. The spectrum of the untreated sample was computer-fitted to 8 peaks def...
Nontronite in a Deep-Sea Core from the South Pacific
Age Charge density Deep sea Iron Mossbauer spectroscopy Nontronite Oxygen isotopes
2012/2/6
Smectite close to the pure Fe end member of the nontronite-beidellite series was found in the fine clay separated from a 354-cm deep sediment core in the southwestern Pacific Basin. The mineral has a ...
Interpretation of Infrared Spectra of Oxidized and Reduced Nontronite
Oxidized Reduced Nontronite Interpretation structural hydroxyls
2012/2/13
Infrared spectra of nontronite reveal shifts to lower wave, number in peaks located at 3570, 1030, and 821 cm−1, which are assigned to vibrational modes for O-H stretching, Si-Ob (basal oxygens)...
A Mossbauer and I.R. Spectroscopic Study of the Structure of Nontronite
Mossbauer Nontronite I.R. Spectroscopic
2012/2/13
Mossbauer and i.r. spectra of a series of nontronites show that Fe3+ and Al3+ are distributed between tetrahedral and octahedral sites. The M鰏sbauer results have reaffirmed the occupation by Fe3+ of o...
Nickeliferous Nontronite, a 15A Garnierite, at Niquelandia, Goias, Brazil
Nickeliferous Nontronite 15A Garnierite
2012/2/15
Garnierite from the Tocantins Complex at Niquelandia, Brazil, is a 15侌, dioctahedral clay mineral, nickeliferous nontronite. The principal octahedral cations are Fe3+, Al and Ni. The ferric state of t...
Phase Transitions in Complexes of Nontronite with n-Alkanols
Phase Transitions Complexes Nontronite n-Alkanols
2012/2/15
The basal spacings of long chain n-alkanol complexes of nontronite saturated with Li+, K+ Mg2+, Ca2+, Sr2+ and Ba2+ were measured for temperatures increasing from −70°C up to 130°C. With rising ...
A Ferroan Nontronite from the Red Sea Geothermal System
Ferroan Nontronite the Red Sea Geothermal System
2012/2/17
A smectite rich in ferrous iron and low in aluminum occurs abundantly in the Red Sea Geothermal Deposits, and appear to be forming at present.Chemical analyses and Mossbauer spectra indicate the miner...