Phonon density of states of Sn in texturedSnOunder high pressure: Comparison of nuclear inelastic x-ray scattering spectra to a shell model

2006 ◽  
Vol 74 (9) ◽  
Author(s):  
H. Giefers ◽  
S. Koval ◽  
G. Wortmann ◽  
W. Sturhahn ◽  
E. E. Alp ◽  
...  
Keyword(s):  
High Pressure ◽  
Shell Model ◽  
Density Of States ◽  
Phonon Density ◽  
Phonon Density Of States ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Spectra ◽  
Ray Scattering

scholarly journals Nuclear resonant inelastic X-ray scattering at high pressure and low temperature

2015 ◽  
Vol 22 (3) ◽  
pp. 760-765 ◽  
Author(s):  
Wenli Bi ◽  
Jiyong Zhao ◽  
Jung-Fu Lin ◽  
Quanjie Jia ◽  
Michael Y. Hu ◽  
...  
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Density Of States ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Phonon Density ◽  
Phonon Density Of States ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

A new synchrotron radiation experimental capability of coupling nuclear resonant inelastic X-ray scattering with the cryogenically cooled high-pressure diamond anvil cell technique is presented. The new technique permits measurements of phonon density of states at low temperature and high pressure simultaneously, and can be applied to studies of phonon contribution to pressure- and temperature-induced magnetic, superconducting and metal–insulator transitions in resonant isotope-bearing materials. In this report, a pnictide sample, EuFe2As2, is used as an example to demonstrate this new capability at beamline 3-ID of the Advanced Photon Source, Argonne National Laboratory. A detailed description of the technical development is given. The Fe-specific phonon density of states and magnetism from the Fe sublattice in Eu57Fe2As2at high pressure and low temperature were derived by using this new capability.

Phonon density of states ofα- andδ-plutonium by inelastic x-ray scattering

2009 ◽  
Vol 79 (5) ◽  
Author(s):  
M. E. Manley ◽  
A. H. Said ◽  
M. J. Fluss ◽  
M. Wall ◽  
J. C. Lashley ◽  
...  
Keyword(s):  
Density Of States ◽  
Phonon Density ◽  
Phonon Density Of States ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals Structure and phonon density of states of supported size-selected F57eAu nanoclusters: A nuclear resonant inelastic x-ray scattering study

2009 ◽  
Vol 95 (14) ◽  
pp. 143103 ◽  
Author(s):  
B. Roldan Cuenya ◽  
L. K. Ono ◽  
J. R. Croy ◽  
A. Naitabdi ◽  
H. Heinrich ◽  
...  
Keyword(s):  
Density Of States ◽  
Phonon Density ◽  
Phonon Density Of States ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Ray Scattering

scholarly journals Vibrational anisotropy of <i>δ</i>-(Al,Fe)OOH single crystals as probed by nuclear resonant inelastic X-ray scattering

2021 ◽  
Vol 33 (4) ◽  
pp. 485-502
Author(s):  
Johannes Buchen ◽  
Wolfgang Sturhahn ◽  
Takayuki Ishii ◽  
Jennifer M. Jackson
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Single Crystals ◽  
Vibrational Properties ◽  
Phonon Density ◽  
Phonon Density Of States ◽  
X Ray ◽  
X Ray Scattering ◽  
The Mean ◽  
Vibrational Anisotropy

Abstract. The formation of high-pressure oxyhydroxide phases spanned by the components AlOOH–FeOOH–MgSiO2(OH)2 in experiments suggests their capability to retain hydrogen in Earth's lower mantle. Understanding the vibrational properties of high-pressure phases provides the basis for assessing their thermal properties, which are required to compute phase diagrams and physical properties. Vibrational properties can be highly anisotropic, in particular for materials with crystal structures of low symmetry that contain directed structural groups or components. We used nuclear resonant inelastic X-ray scattering (NRIXS) to probe lattice vibrations that involve motions of 57Fe atoms in δ-(Al0.87Fe0.13)OOH single crystals. From the recorded single-crystal NRIXS spectra, we calculated projections of the partial phonon density of states along different crystallographic directions. To describe the anisotropy of central vibrational properties, we define and derive tensors for the partial phonon density of states, the Lamb–Mössbauer factor, the mean kinetic energy per vibrational mode, and the mean force constant of 57Fe atoms. We further show how the anisotropy of the Lamb–Mössbauer factor can be translated into anisotropic displacement parameters for 57Fe atoms and relate our findings on vibrational anisotropy to the crystal structure of δ-(Al,Fe)OOH. As a potential application of single-crystal NRIXS at high pressures, we discuss the evaluation of anisotropic thermal stresses in the context of elastic geobarometry for mineral inclusions. Our results on single crystals of δ-(Al,Fe)OOH demonstrate the sensitivity of NRIXS to vibrational anisotropy and provide an in-depth description of the vibrational behavior of Fe3+ cations in a crystal structure that may motivate future applications of NRIXS to study anisotropic vibrational properties of minerals.

Raman and X-Ray Scattering Studies of High-Pressure Phases of Urea

2005 ◽  
Vol 109 (16) ◽  
pp. 8206-8215 ◽  
Author(s):  
F. J. Lamelas ◽  
Z. A. Dreger ◽  
Y. M. Gupta
Keyword(s):  
High Pressure ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Sound velocity measurements of hcp Fe-Si alloy at high pressure and high temperature by inelastic X-ray scattering

2018 ◽  
Vol 103 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Takanori Sakairi ◽  
Tatsuya Sakamaki ◽  
Eiji Ohtani ◽  
Hiroshi Fukui ◽  
Seiji Kamada ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Sound Velocity ◽  
Velocity Measurements ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals Anisotropic phonon density of states: the application of Rietveld and Mössbauer texture analysis in aligned powders

2009 ◽  
Vol 42 (3) ◽  
pp. 496-501 ◽  
Author(s):  
A. I. Rykov ◽  
M. Seto ◽  
Y. Ueda ◽  
K. Nomura
Keyword(s):  
Single Crystals ◽  
Angular Dependence ◽  
Density Of States ◽  
Rietveld Analysis ◽  
Phonon Density ◽  
X Rays ◽  
Phonon Density Of States ◽  
Thermal Displacement ◽  
X Ray ◽  
Arbitrary Strength

Since it is not always feasible to synthesize single crystals of novel materials, the orientation of layered polycrystals has become an attractive basis for studying the angular dependence of inelastic scattering of X-rays or neutrons. Utilizing Rietveld analysis, the anisotropic properties of layered structures in novel manganites and cuprates have been studied with oriented powders instead of single crystals. The phonon density of states (DOS) and atomic thermal displacement are anisotropic in theA-site-ordered manganites LnBaMn2Oyfor the seriesy= 5 andy= 6 (Ln = Y, La, Sm and Gd). This article establishes the angular dependence of the DOS on texture of arbitrary strength, links the textures observed by X-ray and γ-ray techniques, and solves the problem of disentanglement of the Goldanskii–Karyagin effect and texture in Mössbauer spectra.

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