Long-range order near theCu3Au(001) surface by evanescent x-ray scattering

1991 ◽  
Vol 43 (16) ◽  
pp. 13172-13186 ◽  
Author(s):  
H. Dosch ◽  
L. Mailänder ◽  
H. Reichert ◽  
J. Peisl ◽  
R. L. Johnson
Keyword(s):  
Long Range ◽  
Range Order ◽  
Long Range Order ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Interplay between orbital and magnetic long range order by resonant X-ray scattering in (V1−xCrx)2O3

2001 ◽  
Vol 120 (1-3) ◽  
pp. 1-10 ◽  
Author(s):  
L. Paolasini ◽  
S. Di Matteo ◽  
C. Vettier ◽  
F. de Bergevin ◽  
A. Sollier ◽  
...  
Keyword(s):  
Long Range ◽  
Range Order ◽  
Long Range Order ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

X-Ray Diffraction Studies of Zwitterionic Associating Polymers

1989 ◽  
Vol 177 ◽  
Author(s):  
Y. Shen ◽  
C. R. Safinya ◽  
L. Fetters ◽  
M. Adam ◽  
T. Witten ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Long Range ◽  
Structural Phase ◽  
Range Order ◽  
Long Range Order ◽  
X Ray ◽  
Molecular Weights ◽  
X Ray Scattering ◽  
Associating Polymers ◽  
Ray Scattering

ABSTRACTWe have carried out x-ray scattering studies in melts of a series of linear polyisoprenes with highly polar sulfo-zwitterion groups at one end. The zwitterion end groups cause aggregation in good solvents for polyisoprene. The aggregation number depends strongly on the molecular weight of the polyisoprene tails and on the polarity of the solvent. Molecular mechanics simulations of the interactions between the zwitterion head groups suggest tubelike or diskline structures for the aggregates. Spherical structures are not energetically favorable. High resolution synchrotron x-ray scattering studies were carried out for six different (chain) molecular weights between 2000 and 23,000. For low molecular weights (between 2000 and 4000) a tubular structure is found with the tubes organized on a well-defined, two-dimensional triangular lattice with very large domain sizes >2000Å. A structural phase transition to a cubic (bcc) phase with long range order is observed to occur for molecular weights >10,000. The lattice spacing increase over the molecular range was between 95Å (for MW-2000) and 206Å (for MW-23,000). For the high molecular weight melts, annealing transforms the structure from (bcc) (with long range order) to an (fcc) disordered structure with short range order.

Time-Resolved X-ray Scattering Investigation of Ordering Kinetics in Fe3Ai

1990 ◽  
Vol 205 ◽  
Author(s):  
B. Park ◽  
G. B. Stephenson ◽  
K. F. Ludwig ◽  
S. M. Allen
Keyword(s):  
Long Range ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Long Range Order ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Disordered Phase ◽  
Kinetics Of

AbstractWe have investigated the kinetics of the B2/DO3 transition in Fe3AI (28 at. %) using in situ time-resolved x-ray scattering. In these experiments, the evolution of the diffuse and/or Bragg intensity near the (½ ½ ½) DO3 superlattice peak is observed after the temperature of the sample is abruptly changed. H-ere we present results for the kinetics of re-equilibration of short-range order within the disordered (B2) phase, and of short- and long-range order within the ordered (DO3) phase. The short-range order is characterized by the diffuse peak intensity IDIFFUSE and correlation length ξ;the long-range order is characterized by the Bragg intensity IBRAGG. For quenches within the disordered phase, IDIFFUSE and ξ both relax exponentially at the same rate. The temperature dependence of the relaxation time shows evidence of a divergence at the critical temperature. For shallow quenches within the ordered phase, IBRAGG, IDIFFUSE and ξ all relax exponentially, but with different rates. However, for deep quenches within the ordered phase, IDIFFUSE and ξ do not show simple exponential relaxation. Instead, coarsening of short-range order into long-range order is seen, as in quenches from the disordered phase into the ordered phase. Investigation of up-quenches and down-quenches to the same temperature within the ordered phase indicates that disordering is faster than ordering.

X-ray-scattering study of finite-range order inBa2YCu3O6.7

1988 ◽  
Vol 37 (13) ◽  
pp. 7920-7923 ◽  
Author(s):  
R. M. Fleming ◽  
L. F. Schneemeyer ◽  
P. K. Gallagher ◽  
B. Batlogg ◽  
L. W. Rupp ◽  
...  
Keyword(s):  
Range Order ◽  
Finite Range ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Ray Scattering

Short range order in liquid acetic acid as studied by X-ray scattering and DFT calculations

2012 ◽  
Vol 173 ◽  
pp. 164-171 ◽  
Author(s):  
Nourhane Ben Zineb ◽  
Abir Chebaane ◽  
Ferid Hammami ◽  
Mohamed Bahri ◽  
Salah Nasr
Keyword(s):  
Acetic Acid ◽  
Dft Calculations ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals Zur Darstellung und Kristallstruktur von β-NbO2 / Synthesis and Crystal Structure of β-NbO2

1982 ◽  
Vol 37 (11) ◽  
pp. 1361-1368 ◽  
Author(s):  
H.-J. Schweizer ◽  
Reginald Gruehn
Keyword(s):  
Crystal Structure ◽  
Long Range ◽  
Chemical Transport ◽  
Range Order ◽  
Long Range Order ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Lattice Constants

By using chemical transport reactions with various transporting agents (HgCl2, NbCl5, Nb3O7Cl) a slightly substoiehiometric NbO2-phase, β-NbO2, was obtained from samples with O/Nb ∼ 1.5 (source; T > 1373 K) and with deposition temperatures > 1273 K (sink). The rango of composition of β-NbO2 was found to exist from NbO1.990 to NbO1.998.The structure of the tetragonal, column-shaped black crystals was determined by X-ray diffraction. It crystallizes tetragonally in the space group I41 with lattice constants a = 9.693(3) Å, c = 5.985(1) Å and Z = 10 formula units.The crystal structure of β-NbO2 is shown to be a deformed rutile type. As in α-NbO2 the Nb-atoms are grouped in pairs. However, both oxides are different with respect to their long-range order.

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