Local order hypotheses and atomic arrangement in the glassy alloy Cu0.20As0.35Te454545by X-ray diffraction

1994 ◽  
Vol 29 (12) ◽  
pp. 3316-3322 ◽  
Author(s):  
C. Wagner ◽  
J. Vázquez ◽  
P. Villares ◽  
R. Jiménez-Garay
Keyword(s):  
Glassy Alloy ◽  
Local Order ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Arrangement

Local-order hypotheses and atomic arrangement in the glassy alloy As0.45Se0.05Te0.50 by X-ray diffraction

1993 ◽  
Vol 15 (7) ◽  
pp. 995-1008
Author(s):  
J. Vázquez ◽  
R. A. Ligero ◽  
M. Casas-Ruiz ◽  
R. Jiménez-Garay
Keyword(s):  
Glassy Alloy ◽  
Local Order ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Arrangement

A study of short-range order and atomic arrangement in the glassy alloy Cu0.03Ge0.20Te0.77 by X-ray diffraction

1993 ◽  
Vol 33 (3-4) ◽  
pp. 245-253 ◽  
Author(s):  
M. Casas-Ruiz ◽  
J. Vázquez ◽  
R.A. Ligero ◽  
R. Jiménez-Garay
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Glassy Alloy ◽  
Range Order ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Arrangement

Local order hypotheses and spatial atomic distribution in the glassy alloy Cu0.05Ge0.15Te0.80 by X-ray diffraction

1992 ◽  
Vol 14 (2-3) ◽  
pp. 143-148 ◽  
Author(s):  
M. Casas-Ruiz ◽  
J. Vázquez ◽  
R.A. Ligero ◽  
R. Jiménez-Garay
Keyword(s):  
Glassy Alloy ◽  
Local Order ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Distribution

Local order in CVD diamond films : Comparative Raman, x-ray-diffraction, and x-ray-absorption near-edge studies

1998 ◽  
Vol 57 (22) ◽  
pp. 14123-14132 ◽  
Author(s):  
L. Fayette ◽  
B. Marcus ◽  
M. Mermoux ◽  
G. Tourillon ◽  
K. Laffon ◽  
...  
Keyword(s):  
Diamond Films ◽  
Cvd Diamond ◽  
Local Order ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

Thermal expansion and high-temperature phase transformation of the yttrium silicate Y2SiO5

2001 ◽  
Vol 16 (8) ◽  
pp. 2251-2255 ◽  
Author(s):  
J. W. Nowok ◽  
J. P. Kay ◽  
R. J. Kulas
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Linear Thermal Expansion ◽  
Anomalous Behavior ◽  
High Temperature Phase ◽  
Local Order ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Yttrium Silicate

The linear thermal-expansion coefficients of yttrium silicate Y2SiO5, [Y2(SiO4)O] were measured in the temperature range from 20 to 1400 °C using x-ray diffraction. The anomalous behavior of thermal expansion was observed above Tc = 850 °C and was attributed to the displacive phase transformation. The transformation was reversible and resulted from the local order °C the compositional disorder and local fluctuation in the elastic free energy constrained a secondary transformation related to the polymorphic twin transformation. This created an additional peak in x-ray diffraction patterns at 2 's intensity. The characteristic of phase transformation both on heating and on cooling of the sample was also investigated using the differential thermal analysis method. The thermogravimetric technique did not indicate on a change of weight at Tc.

3D Atomic Arrangement at Functional Interfaces Inside Nanoparticles by Resonant High-Energy X-ray Diffraction

2015 ◽  
Vol 7 (41) ◽  
pp. 23265-23277 ◽  
Author(s):  
Valeri Petkov ◽  
Binay Prasai ◽  
Sarvjit Shastri ◽  
Tsan-Yao Chen
Keyword(s):  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Arrangement

Investigation of mechanical alloying of Ti–Al compounds using perturbed γγ-angular correlation spectroscopy, x-ray diffraction, and differential scanning calorimetry

2002 ◽  
Vol 17 (8) ◽  
pp. 2130-2139 ◽  
Author(s):  
St. Lauer ◽  
Z. Guan ◽  
H. Wolf ◽  
Th. Wichert
Keyword(s):  
Differential Scanning Calorimetry ◽  
Angular Correlation ◽  
Metastable Phase ◽  
Correlation Spectroscopy ◽  
Atomic Scale ◽  
Local Order ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Scanning Calorimetry ◽  
X Ray

Ti0.50Al0.50 and Ti0.75Al0.25 compounds were mechanically alloyed by ball milling of elemental Ti and Al powders. Radioactive 111In atoms incorporated into these compounds were used to investigate the different locally ordered crystalline structures by perturbed γγ-angular correlation spectroscopy (PAC). The formation of the intermetallic compounds γ–TiAl and α2–Ti3Al was observed on an atomic scale and occurred as a consequence of the heat treatment of mechanically alloyed Ti0.50Al0.50 and Ti0.75Al0.25, respectively. Due to the sensitivity of PAC to local order on an atomic scale, information about formation conditions and thermal stability of a new metastable phase with an ordered tetragonal crystal structure is presented for Ti0.50Al0.50 samples. In addition, the formation of the ordered phase Ti2AlN was observed, indicating the incorporation of N during the milling process. The PAC investigations were complemented by x-ray diffraction and differential scanning calorimetry measurements.

Raman and luminescence spectroscopy study of europium doped zirconia

2008 ◽  
Vol 23 (7) ◽  
pp. 1854-1861 ◽  
Author(s):  
James Ovenstone ◽  
Robert Withnall ◽  
Jack Silver
Keyword(s):  
Raman Spectroscopy ◽  
Strong Influence ◽  
Synthesis Method ◽  
Emission Spectra ◽  
Luminescence Spectroscopy ◽  
Local Order ◽  
Spectroscopy Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Europium Concentration

A Raman spectrometer was used to probe the structure and luminescence of a range of europium-doped zirconia phosphors prepared by different routes. We have demonstrated that the synthesis method and precursor type have a strong influence on the structure and luminescence of the final phosphor product. Raman spectroscopy has also demonstrated the presence of local order around the dopant ions that is not apparent in x-ray diffraction (XRD) and corresponds with changes in luminescence. As europium concentration is increased from 1 mol% to 20 mol%, the long range structure (from XRD) changes from tetragonal to cubic. Raman spectroscopy, however, shows that the 1 mol% material has a localized structure similar to the monoclinic undoped zirconia. This localized symmetry can explain the differences observed previously in emission spectra.

Synchrotron X-ray diffuse scattering from a stable polymorphic material: terephthalic acid, C8H6O4

2017 ◽  
Vol 73 (1) ◽  
pp. 112-121 ◽  
Author(s):  
D. J. Goossens ◽  
E. J. Chan
Keyword(s):  
Phase Transition ◽  
Terephthalic Acid ◽  
Diffuse Scattering ◽  
Structural Phase ◽  
Local Order ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Harmonic Model ◽  
X Ray ◽  
Polymorphic Materials

Terephthalic acid (TPA, C8H6O4) is an industrially important chemical, one that shows polymorphism and disorder. Three polymorphs are known, two triclinic [(I) and (II)] and one monoclinic (III). Of the two triclinic polymorphs, (II) has been shown to be more stable in ambient conditions. This paper presents models of the local order of polymorphs (I) and (II), and compares the single-crystal diffuse scattering (SCDS) computed from the models with that observed from real crystals. TPA shows relatively weak and less-structured diffuse scattering than some other polymorphic materials, but it does appear that the SCDS is less well modelled by a purely harmonic model in polymorph (I) than in polymorph (II), according to the idea that the diffuse scattering is sensitive to anharmonicity that presages a structural phase transition. The work here verifies that displacive correlations are strong along the molecular chains and weak laterally, and that it is not necessary to allow the —COOH groups to librate to successfully model the diffuse scattering – keeping in mind that the data are from X-ray diffraction and not directly sensitive to H atoms.

X-ray diffraction and local order modelling of GexSe1−x amorphous alloys

1980 ◽  
Vol 35-36 ◽  
pp. 1227-1232 ◽  
Author(s):  
J.C. Malaurent ◽  
J. Dixmier
Keyword(s):  
Amorphous Alloys ◽  
Local Order ◽  
X Ray Diffraction ◽  
X Ray
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