Effect of Cation Sublattice Ordering on Structure and Raman Scattering of ZnGeN2

2013 ◽  
Vol 1493 ◽  
pp. 237-242 ◽  
Author(s):  
Eric Blanton ◽  
Keliang He ◽  
Jie Shan ◽  
Kathleen Kash
Keyword(s):  
Density Of States ◽  
Growth Temperature ◽  
Cation Sublattice ◽  
Phonon Density ◽  
Phonon Density Of States ◽  
X Ray Diffraction ◽  
Vapor Liquid Solid ◽  
X Ray ◽  
Partial Pressures ◽  
Vapor Liquid Solid Mechanism

ABSTRACTThe semiconductor ZnGeN2 was grown by a vapor-liquid-solid mechanism. Ordering of the Zn-Ge sublattice with growth temperature and Zn partial pressure was investigated by powder x-ray diffraction and was found to be sensitive to the growth temperature and insensitive, over the range explored, to the Zn and NH3 partial pressures. The degree of disorder on the cation sublattice was observed to correlate with the suppression of predicted Raman peaks and the emergence of phonon density-of-states features.

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.

Preparation and Growth Mechanism of Hexagonal MgAl2O4 Spinel Fibers

2008 ◽  
Vol 368-372 ◽  
pp. 409-411 ◽  
Author(s):  
Dao Yuan Yang ◽  
Fen Ling Qian ◽  
Kai Zhu ◽  
Zhan Ling Lu ◽  
Rui Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Growth Mechanism ◽  
Nitrogen Atmosphere ◽  
X Ray Diffraction ◽  
Vapor Liquid Solid ◽  
X Ray ◽  
Structure And Morphology ◽  
Vapor Liquid Solid Mechanism ◽  
Scanning Electron

Hexagonal MgAl2O4 spinel fibers were synthesized at 1500oC for 6h in nitrogen atmosphere. The structure and morphology of the fibers were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The fibers grew via vapor- liquid- solid mechanism. The twin mechanism was suggested to play a key role in the formation process of the hexagonal fibers.

Investigation of the Growth of 3C-SiC on Si by Vapor-Liquid-Solid ( VLS ) Transport

2011 ◽  
Vol 679-680 ◽  
pp. 99-102 ◽  
Author(s):  
Stéphane Berckmans ◽  
Laurent Auvray ◽  
Gabriel Ferro ◽  
François Cauwet ◽  
Davy Carole ◽  
...  
Keyword(s):  
Melting Point ◽  
Liquid Phase ◽  
Growth Temperature ◽  
Target Temperature ◽  
X Ray Diffraction ◽  
Raman Spectrometry ◽  
Vapor Liquid Solid ◽  
X Ray ◽  
Vls Growth ◽  
Germanium Layer

In this work, the growth by Vapour-Liquid-Solid (VLS) mechanism of 3C-SiC on silicon substrate is reported. Firstly, a germanium layer is deposited on the substrate. Then the temperature of the sample is increased above Ge melting point in order to form a SiGe liquid phase by reaction with the substrate. Upon reaching the target temperature (1100-1300°C) the VLS growth starts with the injection of propane in the reactor. Both Raman spectrometry and X-Ray diffraction analyses evidenced the formation of 3C-SiC on every sample. However, this SiC deposit, a few micrometers thick, is always found to be polycrystalline though textured. In parallel, the presence of an epitaxial Si-Ge alloy, whose composition depends on the growth temperature, was systematically detected between Si and SiC.

FORMATION OF Y- AND T-JUNCTION Ge NANOWIRES BY VAPOR–LIQUID–SOLID MECHANISM

2007 ◽  
Vol 06 (06) ◽  
pp. 467-471
Author(s):  
K. DAS ◽  
A. K. CHAKRABORTY ◽  
M. L. N. GOSWAMI ◽  
R. K. SINGHA ◽  
A. DHAR ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
X Ray Diffraction ◽  
Vapor Liquid Solid ◽  
X Ray ◽  
Transmission Electron ◽  
Vapor Liquid Solid Mechanism ◽  
Vapor Liquid

A vapor–liquid–solid method has been used to grow Ge nanowires on Au -coated Si (100) substrates with diameters ranging from 30–80 nm. The nanowires have been found to form Y- and T-junctions along with the growth of straight nanowires of length up to 10 μm. X-ray diffraction and Raman analyses support the formation of a core-sheath Ge – GeO 2 structure in consistent with the observation made by transmission electron microscopy.

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 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.

The solids phonon density of states reconstruction from the heat-type experiments: the computation resources

1998 ◽  
Vol 3 (0) ◽  
pp. 135-138
Author(s):  
В. М. Різак ◽  
І. М. Різак ◽  
І. П. Коссей ◽  
В. В. Маслюк
Keyword(s):  
Density Of States ◽  
Phonon Density ◽  
Phonon Density Of States
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