scholarly journals Mössbauer spectroscopy cell for in situ catalyst characterization and reaction kinetics studies at high pressures

1981 ◽  
Vol 52 (6) ◽  
pp. 858-862 ◽  
Author(s):  
W. M. Shen ◽  
J. A. Dumesic ◽  
C. G. Hill
Keyword(s):  
Mössbauer Spectroscopy ◽  
Reaction Kinetics ◽  
High Pressures ◽  
Mossbauer Spectroscopy ◽  
Catalyst Characterization ◽  
Kinetics Studies ◽  
Mößbauer Spectroscopy

In situ 119Sn Mössbauer spectroscopy study of Sn-based electrode materials

2006 ◽  
Vol 167 (1-3) ◽  
pp. 733-738 ◽  
Author(s):  
Abdelmaula Aboulaich ◽  
Florent Robert ◽  
Pierre Emmanuel Lippens ◽  
Laurent Aldon ◽  
Josette Olivier-Fourcade ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Electrode Materials ◽  
Mossbauer Spectroscopy ◽  
Spectroscopy Study ◽  
119Sn Mössbauer Spectroscopy ◽  
Mößbauer Spectroscopy

Influence of soil redox conditions on oxidation of biotite

Clay Minerals ◽  
1986 ◽  
Vol 21 (2) ◽  
pp. 149-157 ◽  
Author(s):  
S. Bouda ◽  
K. P. Isaac
Keyword(s):  
Mössbauer Spectroscopy ◽  
Soil Profile ◽  
Mossbauer Spectroscopy ◽  
Redox Conditions ◽  
Soil Profiles ◽  
Moderate Degree ◽  
Soil Redox ◽  
Mößbauer Spectroscopy

AbstractBiotites from three peaty gleyed podzol soil profiles on ranite bedrock were examined to investigate the oxidation of the octahedral Fe during weathering. Oxidation of these biotites as determined by Mössbauer spectroscopy shows a good correlation with the in situ measured soil Eh values of the sampled horizons. In every soil profile the highest Eh measured is in the A horizon and the lowest in the C horizon. Similarly, biotites from the A horizons are the most oxidized compared with those from the lower horizons. In most of the samples the oxidation is accompanied by loss of K+ from the lattice, as demonstrated by a moderate degree of vermiculitization.

scholarly journals A Synchrotron Mössbauer Spectroscopy Study of a Hydrated Iron-Sulfate at High Pressures

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 146
Author(s):  
Tyler Perez ◽  
Gregory J. Finkelstein ◽  
Olivia Pardo ◽  
Natalia V. Solomatova ◽  
Jennifer M. Jackson
Keyword(s):  
Mössbauer Spectroscopy ◽  
Ferrous Iron ◽  
High Pressures ◽  
Mossbauer Spectroscopy ◽  
Spin Transition ◽  
Iron Sulfate ◽  
Helium Pressure ◽  
Powdered Sample ◽  
Mößbauer Spectroscopy ◽  
Electronic Environment

Szomolnokite is a monohydrated ferrous iron sulfate mineral, FeSO4·H2O, where the ferrous iron atoms are in octahedral coordination with four corners shared with SO4 and two with H2O groups. While somewhat rare on Earth, szomolnokite has been detected on the surface of Mars along with several other hydrated sulfates and is suggested to occur near the surface of Venus. Previous measurements have characterized the local environment of the iron atoms in szomolnokite using Mössbauer spectroscopy at a range of temperatures and 1 bar. Our study represents a step towards understanding the electronic environment of iron in szomolnokite under compression at 300 K. Using a hydrostatic helium pressure-transmitting medium, we explored the pressure dependence of iron’s site-specific behavior in a synthetic szomolnokite powdered sample up to 95 GPa with time-domain synchrotron Mössbauer spectroscopy. At 1 bar, the Mössbauer spectrum is well described by two Fe2+-like sites and no ferric iron, consistent with select conventional Mössbauer spectra evaluations. At pressures below 19 GPa, steep gradients in the hyperfine parameters are most likely due to a structural phase transition. At 19 GPa, a fourth site is required to explain the time spectrum with increasing fractions of a low quadrupole splitting site, which could indicate the onset of another transition. Above 19 GPa we present three different models, including those with a high- to low-spin transition, that provide reasonable scenarios of electronic environment changes of the iron in szomolnokite with pressure. We summarize the complex range of Fe2+ spin transition characteristics at high-pressures by comparing szomolnokite with previous studies on ferrous-iron bearing phases.

In situ— High Temperature Mössbauer Spectroscopy of Iron Nitrides and Nitridoferrates

2003 ◽  
Vol 629 (10) ◽  
pp. 1787-1794 ◽  
Author(s):  
V. Ksenofontov ◽  
S. Reiman ◽  
M. Waldeck ◽  
R. Niewa ◽  
R. Kniep ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
High Temperature ◽  
Mossbauer Spectroscopy ◽  
Iron Nitrides ◽  
Mößbauer Spectroscopy

In-situ Mössbauer spectroscopy with MIMOS II

2011 ◽  
Vol 207 (1-3) ◽  
pp. 97-105 ◽  
Author(s):  
Iris Fleischer ◽  
◽  
Göstar Klingelhöfer ◽  
Richard V. Morris ◽  
Christian Schröder ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Mößbauer Spectroscopy ◽  
Mimos Ii

Corrosion Product Identification by Micro-Raman and Mossbauer Spectroscopy

1998 ◽  
Vol 4 (S2) ◽  
pp. 506-507
Author(s):  
F. Adar ◽  
B. Lenain ◽  
D. C. Cook ◽  
S. J. Oh
Keyword(s):  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Spot Size ◽  
Corrosion Products ◽  
Raman Spectrometry ◽  
Mößbauer Spectroscopy ◽  
Metallographic Cross Section ◽  
Steel Coupon ◽  
In Situ Scattering

Micro-Raman spectrometry and Mossbauer spectroscopy have been used to identify the corrosion products on a steel coupon exposed in an industrial environment for 16 years. The Raman analysis was performed on a polished metallographic cross-section in order to map the oxides across the thickness of the coating. The spectra were recorded using a LabRam Micro-Raman spectrograph incorporating a 17 mW HeNe laser (attenuated to 1 mW to prevent oxide transformation), focused to 1 μm spot size, and 1800 g/mm grating. The confocal line-scan imaging enabled 100 spectra to be recorded in one scan at 0.5 um intervals across the thickness of the coating. The Mossbauer analysis was performed using in-situ scattering Mossbauer spectroscopy on the attached corrosion coating and transmission Mossbauer spectroscopy at 300K and 77K on the removed coating, to measure the fraction of each oxide present. Micro-Raman spectrometry showed that the corrosion products had formed in distinct layers as shown in Figure 1.

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