The effect of citrate bicarbonate dithionite treatment on standard and soil smectites as evidenced by 57Fe Mössbauer spectroscopy

Soil Research ◽  
1987 ◽  
Vol 25 (2) ◽  
pp. 145 ◽  
Author(s):  
CM Cardile ◽  
CW Childs ◽  
JS Whitton
Keyword(s):  
Particle Size ◽  
Mössbauer Spectra ◽  
Tetrahedral Site ◽  
Aggregate Size ◽  
Soil Samples ◽  
Particle Sizes ◽  
Apparent Contradiction ◽  
57Fe Mössbauer ◽  
Mossbauer Spectra ◽  
Selection Of

The 57Fe Mossbauer spectra of a selection of smectitic clay fractions of CBD-treated soil samples were measured and computer-fitted with appropriate Fe3+ and Fe2 + resonances. The shape of the Fe3+ spectral envelopes suggested that all the clays were dominated by montmorillonite, contradicting the indications of the Greene-Kelly test. Experiments with untreated and CBD-treated nontronite and montmorillonite showed, however, that the apparent contradiction was probably the result of significant disruption of the smectites by the CBD treatment. The occurrence of this disruption also casts doubt on the validity of using the Greene-Kelly test on CBD-treated samples. The computer-fitted Mossbauer spectra of nontronite with different particle sizes (specifically aggregate size) demonstrated a relationship between particle size and the line-width of the Fe3+ tetrahedral site resonance. This relationship probably reflects an increasing degree of variability in the tetrahedral site with increasing particle size.

Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

2009 ◽  
Vol 189 (1-3) ◽  
pp. 85-95 ◽  
Author(s):  
Rabia Nazir ◽  
Muhammad Mazhar ◽  
Muhammad Siddique ◽  
S. Tajammul Hussain
Keyword(s):  
Particle Size ◽  
Mössbauer Spectra ◽  
57Fe Mössbauer ◽  
Mossbauer Spectra ◽  
Effect Of Particle Size

Selection of Preprocessing Parameters for PCA of Soil Classification Affected by Particle Sizes Based on Vis/NIR Spectroscopy

2011 ◽  
Vol 467-469 ◽  
pp. 725-730 ◽  
Author(s):  
Hai Qing Yang ◽  
Bo Yan Kuang ◽  
Abdul M. Mouazen
Keyword(s):  
Particle Size ◽  
Soil Texture ◽  
Moving Average ◽  
Nir Spectroscopy ◽  
Soil Classification ◽  
Soil Samples ◽  
Particle Sizes ◽  
Mixed Group ◽  
Standard Normal ◽  
Selection Of

. Instrumental measurement of soil properties are affected by several factors including soil texture. The classification of soil texture can help improve the accuracy of calibration models for soil measurement. In the study, the effect of soil particle size on the selection of preprocessing methods for principle component analysis (PCA) of soil classification was examined. Total 178 soil samples with five textures were collected from Silsoe Farm, Cranfield, England. After dried and ground, soil samples sieved by a 2mm sieve were named by Mixed Group. A Vis/NIR spectrophotometer (LabSpec2500, spectral range 350-2200nm, ASD) was used for spectral scanning of soil samples. After that, all samples were sieved by a 1mm sieve and divided into two groups: one with particle size less than 1mm named by Thin Group and another with particle size between 1mm and 2mm named by Thick Group. Preprocessing methods of moving average with segment size of 5(MA5), standard normal variation (SNV) and 1st Savitzky-Golay derivatives with smoothing points of 3(Der1(3)) were examined. PCA was applied to evaluate the discriminative capacity of MA5, MA5+SNV and MA5+Der1(3). The score plots of 1st~2nd and 2nd~3rd PCs show that MA5+Der1(3) is the best preprocessing method not only for Thick Group and Thin Group, but also for Mixed Group. MA5+SNV is suitable for Thick Group and Thin Group but does not perform well for Mixed Group. Only MA5 does not perform well in any of three groups. The study suggests that pre-processing with 1st derivative is an essential step for soil classification with various particle sizes using Vis/NIR spectroscopy.

Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

ISIAME 2008 ◽  
2009 ◽  
pp. 85-95 ◽  
Author(s):  
Rabia Nazir ◽  
Muhammad Mazhar ◽  
Muhammad Siddique ◽  
S. Tajammul Hussain
Keyword(s):  
Particle Size ◽  
Mössbauer Spectra ◽  
57Fe Mössbauer ◽  
Mossbauer Spectra ◽  
Effect Of Particle Size

Electronic and magnetic states of Fe ions in the Co2FeBO5

2021 ◽  
Author(s):  
Natalia Kazak ◽  
Yurii V. Knyazev ◽  
Vyacheslav Zhandun ◽  
Juan Bartolomé ◽  
Ana Arauzo ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Room Temperature ◽  
Mössbauer Spectra ◽  
Mossbauer Spectroscopy ◽  
57Fe Mössbauer Spectroscopy ◽  
57Fe Mössbauer ◽  
Mossbauer Spectra ◽  
57Fe Mossbauer Spectroscopy ◽  
Magnetic States ◽  
Fe Ions

The ludwigite Co2FeBO5 has been studied experimentally using 57Fe Mössbauer spectroscopy and theoretically by means of the DFT+GGA calculations. The room-temperature Mössbauer spectra are composed of four quadrupole doublets corresponding...

scholarly journals Modelling of Metallic Particle Binders for Increased Part Density in Binder Jet Printed Components

2019 ◽  
Author(s):  
Joseph Roberts ◽  
Peter Green ◽  
Kate Black ◽  
Christopher Sutcliffe
Keyword(s):  
Particle Size ◽  
Critical Radius ◽  
Detailed Knowledge ◽  
Particle Sizes ◽  
Powder Bed ◽  
Beneficial Effects ◽  
Drop Tests ◽  
Maximum Particle ◽  
Packing Efficiency ◽  
Selection Of

Binder jet printed components typically have low overall density in the green state and high shrinkage and deformation after heat treatment. It has previously been demonstrated that, by including nanoparticles of the same material in the binder, these properties can be improved as the nanoparticles can fill the interstices and pore throats between the bed particles. The beneficial effects from using these additive binder particles can be improved by maximising the binder particle size, enabling the space within the powder bed to be filled with a higher packing efficiency. The selection of maximum particle size for a binder requires detailed knowledge of the pores and pore throats between the powder bed particles. In this paper, a raindrop model is developed to determine the critical radius at which binder particles can pass between pores and penetrate the bed. The model is validated against helium pycnometry measurements and binder particle drop tests. It is found that the critical radius can be predicted, with acceptable accuracy, using a linear function of the mean and standard deviation of the particle radii. Percolation theory concepts have been employed in order to generalise the results for powder beds that have different mean particle sizes and size distributions. The results of this work can be employed to inform the selection of particle sizes required for binder formulations, to optimise density and reduce shrinkage in printed binder jet components.

57Fe Mössbauer spectra and magnetic data from the kagomé antiferromagnet H3O-jarosite

ICAME 2005 ◽  
2006 ◽  
pp. 1085-1089
Author(s):  
P. Bonville ◽  
V. Dupuis ◽  
E. Vincent ◽  
P. E. Lippens ◽  
A. S. Wills
Keyword(s):  
Mössbauer Spectra ◽  
Magnetic Data ◽  
57Fe Mössbauer ◽  
Mossbauer Spectra

The method of invariants applied to the analysis of 57Fe Mössbauer spectra

ISIAME 2008 ◽  
2009 ◽  
pp. 579-585
Author(s):  
K. Szymański ◽  
D. Satuła ◽  
L. Dobrzyński
Keyword(s):  
Mössbauer Spectra ◽  
57Fe Mössbauer ◽  
Mossbauer Spectra

57Fe-Mössbauer Spectra and X-Ray Structures of Dipolar Ferrocenylhexasilanes

2008 ◽  
pp. 462-466
Author(s):  
Harald Stger ◽  
Hermann Rautz ◽  
Guido Kickelbick ◽  
Claus Pietzsch
Keyword(s):  
Mössbauer Spectra ◽  
X Ray ◽  
57Fe Mössbauer ◽  
Mossbauer Spectra

The method of invariants applied to the analysis of 57Fe Mössbauer spectra

2009 ◽  
Vol 192 (1-3) ◽  
pp. 77-83 ◽  
Author(s):  
K. Szymański ◽  
D. Satuła ◽  
L. Dobrzyński
Keyword(s):  
Mössbauer Spectra ◽  
57Fe Mössbauer ◽  
Mossbauer Spectra

scholarly journals Investigation of Magnetic Ordering in RCo12B6 (R = Y, Nd) by 57Fe Mössbauer Spectroscopy

1993 ◽  
Vol 46 (5) ◽  
pp. 679 ◽  
Author(s):  
JM Cadogan ◽  
SJ Campbell ◽  
XL Zhao ◽  
E Wu
Keyword(s):  
Basal Plane ◽  
Room Temperature ◽  
Mössbauer Spectra ◽  
57Fe Mössbauer Spectroscopy ◽  
Magnetic Ordering ◽  
Spin Reorientation ◽  
57Fe Mössbauer ◽  
Mossbauer Spectra ◽  
57Fe Mossbauer Spectroscopy ◽  
Increasing Temperature

Mossbauer spectra of YC012B6 and NdCo12B6 doped with enriched 57Fe have been obtained at various temperatures between 4�2 K and room temperature. The spectrum of YC012B6 at 4�2 K indicates that the Co sublattice orders in the crystallographic basal plane. NdCo12B6 orders along or close to the crystallographic c-axis at 4�2 K and undergoes a spin-reorientation with increasing temperature until at ~55 K the magnetisation lies in or near the basal plane.

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