نتایج جستجو برای: ray diffraction

تعداد نتایج: 327749  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1960
Y Takeuchi M J Buerger

The problem of determining the arrangements of atoms in crystals directly from X-ray diffraction data has engaged the attention of crystallographers for some time, and a number of approaches to this general problem have been presented. We have been especially interested in the approach which makes use of imageseeking functions in solving the Patterson synthesis,' which, in turn, is based entire...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2006
Tomohiro Kyotani Soushi Inoue Sonoko Kakui Junji Saito

A zeolite NaA (A-type zeolite of ca. 0.4 nm pore size; Linde Type A, LTA) membrane for the dehydration of alcohol was characterized by X-ray diffraction analysis (XRD). Also, the relationship between the X-ray absorption and the EtOH/H2O pervaporation (PV) dehydration performance (water selectivity and permeation flux) of the LTA membrane was first investigated. The LTA membranes used here were...

Journal: :Physical review letters 2007
S Grenier K J Thomas J P Hill U Staub Y Bodenthin M García-Fernández V Scagnoli V Kiryukhin S-W Cheong B G Kim J M Tonnerre

We report the observation of superstructures associated with the oxygen 2p states in two prototypical manganites using x-ray diffraction at the oxygen K edge. In the stripe order system Bi0.31Ca0.69MnO3, hole-doped O states are orbitally ordered, at the same propagation vector as the Mn orbital ordering, but no oxygen charge stripes are found at this periodicity. In La7/8Sr1/8MnO3, we observe a...

Journal: :Physical review. B, Condensed matter 1996
Srinivasan Bermejo de Andrés A Dawidowski Zúñiga Criado

The existence of an orientationally disordered cubic phase of solid ethanol is revealed by x-ray diffraction and Raman spectroscopic measurements. Such a phase, whose existence was postulated some time ago on the basis of specific-heat measurements, is produced by quenching below some 95 K a plastic crystal formed upon melting and subsequent annealing of the topologically disordered ~glassy! so...

Journal: :Physical review letters 2006
D Kaminski P Poodt E Aret N Radenovic E Vlieg

Using surface x-ray diffraction, we have determined the structure of liquid Bi monolayers on Cu(111) for a range of coverages. By combining diffuse scattering data from the liquid with information from the substrate scattering, the ordering properties of Bi have been fully determined. Even though the substrate is hexagonal, we find that the liquid does not show hexatic order but has an orthorho...

Journal: :Physical review letters 2007
H Enquist H Navirian T N Hansen A M Lindenberg P Sondhauss O Synnergren J S Wark J Larsson

We have observed large-amplitude strain waves following a rapid change in density of InSb due to nonthermal melting. The strain has been measured in real time via time-resolved x-ray diffraction, with a temporal resolution better than 2 ps. The change from the solid to liquid density of the surface layer launches a high-amplitude strain wave into the crystalline material below. This induces an ...

Journal: :Physical review letters 2012
Xiang-Feng Zhou Artem R Oganov Guang-Rui Qian Qiang Zhu

The energy landscape of Mg(BH(4))(2) under pressure is explored by ab initio evolutionary calculations. Two new tetragonal structures, with space groups P4 and I4(1)/acd, are predicted to be lower in enthalpy by 15.4 and 21.2 kJ/mol, respectively, than the earlier proposed P4(2)nm phase. We have simulated x-ray diffraction spectra, lattice dynamics, and equations of state of these phases. The d...

Journal: :Physical review letters 2011
E Möhr-Vorobeva S L Johnson P Beaud U Staub R De Souza C Milne G Ingold J Demsar H Schaefer A Titov

We use time-resolved optical reflectivity and x-ray diffraction with femtosecond resolution to study the dynamics of the structural order parameter of the charge density wave phase in TiSe2. We find that the energy density required to melt the charge density wave nonthermally is substantially lower than that required for thermal suppression and is comparable to the charge density wave condensat...

Journal: :Physical review letters 2017
V Esposito M Fechner R Mankowsky H Lemke M Chollet J M Glownia M Nakamura M Kawasaki Y Tokura U Staub P Beaud M Först

We employ time-resolved resonant x-ray diffraction to study the melting of charge order and the associated insulator-to-metal transition in the doped manganite Pr_{0.5}Ca_{0.5}MnO_{3} after resonant excitation of a high-frequency infrared-active lattice mode. We find that the charge order reduces promptly and highly nonlinearly as function of excitation fluence. Density-functional theory calcul...

Journal: :Physical review letters 2009
M S Pierce K C Chang D Hennessy V Komanicky M Sprung A Sandy H You

We present coherent speckled x-ray diffraction patterns obtained from a monolayer of surface atoms. We measured both the specular anti-Bragg reflection and the off-specular hexagonal reconstruction peak for the Au(001) surface reconstruction. We observed fluctuations of the speckle patterns even when the integrated intensity appears static. By autocorrelating the speckle patterns, we were able ...

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