Fluctuation of long-range order in Co-Pt alloy nanoparticles revealed by time-resolved electron microscopy

2017 ◽  
Vol 110 (15) ◽  
pp. 153101 ◽  
Author(s):  
Kazuhisa Sato ◽  
Hidehiro Yasuda
Keyword(s):  
Electron Microscopy ◽  
Long Range ◽  
Range Order ◽  
Alloy Nanoparticles ◽  
Long Range Order ◽  
Time Resolved ◽  
Pt Alloy

Time-Resolved, Laser-Induced Phase Transformation in Aluminum

1984 ◽  
Vol 35 ◽  
Author(s):  
S. Williamson ◽  
G. Mourou ◽  
J.C.M. Li
Keyword(s):  
Point Defect ◽  
Long Range ◽  
Rapid Heating ◽  
Range Order ◽  
Nucleation Theory ◽  
Long Range Order ◽  
Time Resolved ◽  
Aluminum Films ◽  
Thin Aluminum ◽  
Initial Nucleus

ABSTRACTThe technique of picosecond electron diffraction is used to time resolve the laser-induced melting of thin aluminum films. It is observed that under rapid heating conditions, the long range order of the lattice subsists for lattice temperatures well above the equilibrium point, indicative of superheating. This superheating can be verified by directly measuring the lattice temperature. The collapse time of the long range order is measured and found to vary from 20 ps to several nanoseconds according to the degree of superheating. Two interpretations of the delayed melting are offered, based on the conventional nucleation and point defect theories. While the nucleation theory provides an initial nucleus size and concentration for melting to occur, the point defect theory offers a possible explanation for how the nuclei are originally formed.

The Establishment of Long-Range Order in Ni2Cr Using Electron Microscopy

1970 ◽  
Vol 38 (2) ◽  
pp. 831-836 ◽  
Author(s):  
H. J. Klein ◽  
C. R. Brooks ◽  
E. E. Stansbury
Keyword(s):  
Electron Microscopy ◽  
Long Range ◽  
Range Order ◽  
Long 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.

Time-Resolved Evolution of Short- and Long-Range Order During the Transformation of Amorphous Calcium Carbonate to Calcite in the Sea Urchin Embryo

2013 ◽  
Vol 23 (34) ◽  
pp. 4185-4194 ◽  
Author(s):  
Chantel C. Tester ◽  
Ching-Hsuan Wu ◽  
Minna R. Krejci ◽  
Laura Mueller ◽  
Alex Park ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Long Range ◽  
Sea Urchin ◽  
Range Order ◽  
Long Range Order ◽  
Amorphous Calcium Carbonate ◽  
Time Resolved ◽  
Sea Urchin Embryo
Sign in / Sign up

Export Citation Format

Share Document