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Article
Study of the Crystal Structure and Phase Transition of Li2NH System
Neutron diffraction at different temperatures has been used to study the crystal structure and possible phase transitions of Li2NH. It was found that the crystal structure and phase transition are related to the ...
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Article
Structural Studies of the Superconducting La2.5Y0.5CaBa3(Cu1−xFex)7Oz (0 ≤ x ≤ 0.1) Perovskite System by Neutron Diffraction
We have investigated the effect of Fe substitution on the structural and superconducting properties of La2.5Y0.5CaBa3(Cu1−x Fe x )7O z system b...
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Article
Neutron Structural Studies of the Superconducting (Nd1−yCay)Ba2(Cu0.94Ga0.06)3Oz System
We investigate the influence of Ca ions on the structural and superconducting properties of (Nd1−y Cay)Ba2(Cu0.94Ga0.06)3O z system by Rietveld refinement of the neutron diffrac...
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Article
Hydrogen Sites in the α(TiCrSiO) 1/1 Approximant Phase
Crystal approximant phases are important because they are believed to have a similar local atomic structure to corresponding quasicrystals. Interstitial hydrogen is used as a probe of the local structures of t...
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Article
Neutron and Raman Scattering Studies of Hgba2CuO4+δ
The HgBa2CuO4+δ sample was characterized by Neutron diffraction and magnetic measurements. Both of the measurements indicate a high purity of the sample. Raman measurement was performed on a HgBa2CuO4+δ compound ...
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Article
Precursors of amorphization in supersaturated Nb-Pd solid solutions
The possibility that crystal-to-amorphous phase transformations can be induced by one or more underlying instabilities of the crystalline phase has been investigated in highly supersaturated solid solutions of...
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Chapter
An Introduction to Neutron Scattering
It has been stated that the neutron is the most versatile probe of condensed matter systems. While some may dispute this, it is clear that the unique properties of the neutron make it an extremely important, a...
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Chapter
Applications of Neutron Scattering to Interstitial Alloys
There is an extensive literature on the effect of hydrogen (and deuterium) in metals as well as a variety of studies of the effects of other interstitial species. It is not possible to comprehensively review t...
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Article
Quasielastic gamma-ray scattering from glycerol
The Mössbauer scattering instrument at the Missouri University Research Reactor (MURR) has been used to study the liquid dynamics of glycerol as a function of temperature. The measurements were made by observi...
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Article
Mössbauer spectra obtained by modulation of a scattering crystal
We have carried out numerous experiments with supersources having intensities in the 100 Curie range. These sources usually require massive shielding, and are not easily moved to carry out Mössbauer spectrosco...
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Article
Effects of Elevated Temperature Hydrogen Exposure on the Microstructure of α2- and γ-Based Titanium Aluminide Alloys
Ti-25A1, Ti-25Al-10Nb-2V, and Ti-25Al-10Nb-3V-1Mo (at. %) α2-based alloys, and Ti-48Al and Ti-52Al γ-based alloys were exposed to gaseous hydrogen at elevated temperatures. A novel ternary hydride was observed in...
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Article
Rare-earth nitrides and carbides: A new class of permanent magnet materials
The most recent and exciting development in permanent magnet research is the discovery of rare-earth nitrides and carbides with the 2:17- and l:12- type structures. Nitrogen and carbon enter the lattice inter...
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Article
On the Effects of Magnetic Bonding in Rare Earth Transition Metal Intermetallics
Neutron diffraction experiments on rare-earth transition metal magnetic alloys Er2 Fe14 B and Er 2 Fe 17 have been carried out at temperatures above and below the ordering temperature (Tc). An anomalously large m...
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Article
Poster contributions
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Article
On the Atomic and Magnetic Structure of Er2Fe17
We present the results of Rietveld analysis on the neutron diffraction intensities of Er2Fe17, which crystallizes in the hexagonal Th2Ni17 phase. Of the reflection sets, h-k ≠ 3n, l = 2n+1 and l = 2n, the former ...
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Article
Synthesis and Structural Characterization of a Hydrated Gallosilicate Zeolite with the Nat-Framework
Gallosilicate NAT-framework zeolites have been synthesized from Na2O:TMA2O:Ga2O3:SiO2:H2O gels and characterized by chemical analysis and powder X-ray diffraction. The structure of a hydrated material (Orthorhomb...
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Chapter
Structure and Transitions in Atactic Polystyrene
WANS experiments were performed in order to investigate the liquid state of atactic polystyrene. It was found that PS undergoes both a reversible and an irreversible structural change at a temperature which co...
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Article
Asymmetry parameters in183W and182W using mice detection with a crystal monochromator
Using exceptionally high intensity Mössbauer sources (∼ 1–100 Ci) of182Ta and183Ta, we have measured the Mössbauer effect for the 46.5 and 99.1 keV transitions of183W and the 100.1 keV transition of182W. Using a ...
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Article
Elastic and inelastic scattering in silicon using Mössbauer diffraction
The Mossbauer diffraction instrument at the Missouri University Research Reactor has been used to measure the elastic and inelastic contributions to the 444 Bragg reflection in dynamic silicon at room temperat...
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Chapter
Neutron Diffraction Studies of Cemented Carbide Composites
The appreciation of cemented carbide composite materials (cermets) has become more sophisticated in recent years. The desire for cermets that yield better performance and/or that contain lower amounts of cobal...
