scholarly journals The Surrounded Atom Theory of Order-disorder Phase Transition in Binary Alloys

2011 ◽  
Vol 21 (3) ◽  
pp. 265
Author(s):  
Do Chieu Ha ◽  
Nguyen Nhat Khanh
Keyword(s):  
Phase Transition ◽  
Free Energy ◽  
Critical Temperature ◽  
Binary Alloys ◽  
Disorder Phase Transition ◽  
Atom Model ◽  
Atom Theory

In this paper, the surrounded atom model is developed to study the order-disorder phase transition in binary alloys. We calculate the configurational free energy of the alloys, derive the equation of equilibrium and determine the critical temperature of the phase transition.

Phase transition to blob-hole coherent structure in the Hasegawa–Mima model for plasmas

2021 ◽  
Vol 87 (6) ◽  
Author(s):  
Chjan C. Lim
Keyword(s):  
Phase Transition ◽  
Free Energy ◽  
Critical Temperature ◽  
Partition Function ◽  
Open System ◽  
Ground State ◽  
Spherical Model ◽  
Toroidal Plasmas ◽  
Fixed Energy ◽  
System A

An equilibrium statistical mechanics theory for the Hasegawa–Mima equations of toroidal plasmas, with canonical constraint on energy and microcanonical constraint on potential enstrophy, is solved exactly as a spherical model. The use of a canonical energy constraint instead of a fixed-energy microcanonical approach is justified by the preference for viewing real plasmas as an open system. A significant consequence of the results obtained from the partition function, free energy and critical temperature, is the condensation into a ground state exhibiting a blob-hole-like structure observed in real plasmas.

scholarly journals STRING CORRECTIONS TO THE HAWKING–PAGE PHASE TRANSITION

1999 ◽  
Vol 14 (05) ◽  
pp. 379-385 ◽  
Author(s):  
KARL LANDSTEINER
Keyword(s):  
Phase Transition ◽  
Black Hole ◽  
Free Energy ◽  
Critical Temperature ◽  
String Theory ◽  
Hole Radius ◽  
String Corrections ◽  
Type Iib String Theory

We compute the O(α′3) corrections to the AdS5 black hole metric in type IIB string theory. Contrary to previous work in this direction we keep the black hole radius finite. Thus the topology of the boundary is S3×S1. We find the corrections to the free energy and the critical temperature of the phase transition.

scholarly journals Order-disorder phase transition in black-hole star clusters. II. A scale-free cluster

2019 ◽  
Author(s):  
Scott Tremaine
Keyword(s):  
Phase Transition ◽  
Black Hole ◽  
Relaxation Time ◽  
Critical Temperature ◽  
Semimajor Axis ◽  
Star Clusters ◽  
Relativistic Effects ◽  
Scale Free ◽  
Disorder Phase Transition ◽  
Wide Range

Abstract The supermassive black holes found at the centres of galaxies are often surrounded by dense star clusters. The ages of these clusters are generally longer than the resonant-relaxation time and shorter than the two-body relaxation time over a wide range of radii. We explore the thermodynamic equilibria of such clusters using a simple self-similar model. We find that the cluster exhibits a phase transition between a high-temperature spherical equilibrium and a low-temperature equilibrium in which the stars are on high-eccentricity orbits with nearly the same orientation. In the absence of relativistic precession, the spherical equilibrium is metastable below the critical temperature and the phase transition is first-order. When relativistic effects are important, the spherical equilibrium is linearly unstable below the critical temperature and the phase transition is continuous. A similar phase transition has recently been found in a model cluster composed of stars with a single semimajor axis. The presence of the same phenomenon in two quite different cluster models suggests that lopsided equilibria may form naturally in a wide variety of black-hole star clusters.

ORDER-DISORDER PHASE TRANSITION OF Au(110)-(1x2) RECONSTRUCTION

1988 ◽  
Vol 49 (C6) ◽  
pp. C6-269-C6-273 ◽  
Author(s):  
H. Q. NGUYEN ◽  
Y. KUK ◽  
P. J. SILVERMAN
Keyword(s):  
Phase Transition ◽  
Disorder Phase Transition

scholarly journals Cooper Pair-Like Systems at High Temperature and their Role on Fluctuations Near the Critical Temperature

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3216-3219 ◽  
Author(s):  
M. Ausloos ◽  
S. Dorbolo
Keyword(s):  
Phase Transition ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Critical Temperature ◽  
Oxygen Diffusion ◽  
Cooper Pair ◽  
Anomalous Behavior ◽  
Anomalous Effect ◽  
Linear Temperature ◽  
Ybco Sample

A logarithmic behavior is hidden in the linear temperature regime of the electrical resistivity R(T) of some YBCO sample below 2T c where "pairs" break apart, fluctuations occur and "a gap is opening". An anomalous effect also occurs near 200 K in the normal state Hall coefficient. In a simulation of oxygen diffusion in planar 123 YBCO, an anomalous behavior is found in the oxygen-vacancy motion near such a temperature. We claim that the behavior of the specific heat above and near the critical temperature should be reexamined in order to show the influence and implications of fluctuations and dimensionality on the nature of the phase transition and on the true onset temperature.

A priori study of the order-disorder phase transition in NaNO2

1993 ◽  
Vol 87 (12) ◽  
pp. 1151-1154 ◽  
Author(s):  
H.M. Lu ◽  
R. Qi ◽  
J.R. Hardy
Keyword(s):  
Phase Transition ◽  
A Priori ◽  
Disorder Phase Transition

Order-Disorder Phase Transition in TEA+(TCNQ)2-

1983 ◽  
Vol 120 (2) ◽  
pp. 547-554 ◽  
Author(s):  
A. Brau ◽  
J. P. Farges ◽  
A. Filhol ◽  
H. Grassi
Keyword(s):  
Phase Transition ◽  
Disorder Phase Transition
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