Kinetics of Surface Ordering on Au-Rich Cu3Au(001)

1990 ◽  
Vol 205 ◽  
Author(s):  
S. B. Rivers ◽  
W. N. Unertl ◽  
H. H. Hung ◽  
K. S. Liang
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Grazing Incidence ◽  
Range Order ◽  
X Ray ◽  
Disorder Phase Transition ◽  
Surface Ordering ◽  
X Ray Scattering ◽  
Kinetics Of ◽  
Plane Diffraction

Abstractwe report grazing-incidence x-ray scattering measurements of the order-disorder phase transition near a Au-rich Cu3Au (001) surface. The bulk transition temperature TB = 648 K is lower than for stoichiometric Cu3Au(001). Surface ordering persists above TB in a layer several monolayers thick up to Ts = 667 K. Kinetics of the ordering were studied by quenching from Ts + 9 K to final temperatures of TF = 661 K and 645 K. Short-range order is established in the bulk within the quench time and does not appear to change subsequently. The bulk short-range order differs from that reported for stoichiometric Cu3Au. For TB < TF = 661 K < TS, the (100) in-plane diffraction beam intensity grows approximately as t1/4 for t > 1000 s and the width continues to narrow. For TF = 645 K < TB, power law growth is not observed for the longest times studied. In both cases the growth is substantially slower than predicted.

Detection of short range order in SiO2 thin-films by grazing-incidence wide and small-angle X-ray scattering

2016 ◽  
Vol 119 (15) ◽  
pp. 154103
Author(s):  
Kohki Nagata ◽  
Atsushi Ogura ◽  
Ichiro Hirosawa ◽  
Tomoyuki Suwa ◽  
Akinobu Teramoto ◽  
...  
Keyword(s):  
Thin Films ◽  
Small Angle ◽  
Short Range ◽  
Short Range Order ◽  
Grazing Incidence ◽  
Range Order ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

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.

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

Anomalous-X-ray scattering associated with short-range order in an Al70Ni15Co15 decagonal quasicrystal

2000 ◽  
Vol 294-296 ◽  
pp. 299-302 ◽  
Author(s):  
Hiroshi Abe ◽  
Nobumichi Tamura ◽  
D Le Bolloc’h ◽  
Simon C Moss ◽  
Yoshie Matsuo ◽  
...  
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Decagonal Quasicrystal ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

SHORT RANGE ORDER IN Ni–Nb ALLOY

1989 ◽  
Vol 03 (14) ◽  
pp. 1105-1111
Author(s):  
TAHIR ABBAS ◽  
NAVEED AHMAD ◽  
FARID AKHTAR KHAWAJA ◽  
ISHTIAQ AHMAD
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Order Parameters ◽  
Range Order ◽  
Local Order ◽  
Pseudopotential Theory ◽  
Scattering Intensity ◽  
Absolute Value ◽  
X Ray ◽  
X Ray Scattering

Diffuse X-ray scattering intensity was measured in polycrystalline samples of Ni–Nb system. From this diffuse scattering intensity, short-range order parameters and size effect parameters were calculated. The absolute value of short-range order parameters suggest a local order present in this alloy. The ordering potential was calculated on the basis of the statistical pseudopotential theory of ordering and it was found that the calculations take into account the experimentally observed sign of the short-range order parameters.

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