scholarly journals Phase diagrams of a model diluted fcc magnet with arbitrary spin and modified RKKY interaction: Influence of external magnetic field and structural short-range order

2008 ◽  
Vol 77 (11) ◽  
Author(s):  
Karol Szałowski ◽  
Tadeusz Balcerzak
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Phase Diagrams ◽  
Short Range ◽  
Short Range Order ◽  
Arbitrary Spin ◽  
Range Order ◽  
Rkky Interaction

Short range order and phase diagrams of binary alloys

1975 ◽  
Vol 51 (7) ◽  
pp. 401-402 ◽  
Author(s):  
A.B. Bhatia ◽  
N.H. March
Keyword(s):  
Phase Diagrams ◽  
Short Range ◽  
Short Range Order ◽  
Binary Alloys ◽  
Range Order

Influence of Magnetic Field on Formation of Short Range Order Regions in Liquid Metals: Fluctuation Hypothesis

2018 ◽  
Vol 777 ◽  
pp. 316-321 ◽  
Author(s):  
Mikhail Arkulis ◽  
Oxana Logunova ◽  
Denis Dolgushin
Keyword(s):  
Magnetic Field ◽  
Temperature Fluctuation ◽  
Short Range ◽  
Short Range Order ◽  
Liquid Metals ◽  
Range Order ◽  
Crystallization Time ◽  
Theoretical Justification ◽  
Manufacturing Operations ◽  
Analytical Expressions

The aim of this investigation is to provide theoretical justification of the crystallizing nucleus formation in liquid iron. To solve this problem, the authors put forward the fluctuation hypothesis: short range order region formation in liquid metal takes place due to temperature fluctuations, and the temperature of the short range order is the temperature fluctuation around Kelvin scale zero in the course of crystallization time. The investigations were carried out for liquid state of the substance, in particular, for iron in paramagnetic state at the melting temperature. Analytical derivation of the temperature fluctuation value was given. Analytical expressions were obtained to define the average number of atoms in the short range order region for crystallizing iron. The investigation results show that short range order contains enough atoms to provide interaction with pulsed magnetic field resulting in the increase in the number of crystallization nuclei and in the decrease of their size. The obtained results can be used in the decision-making process concerning some manufacturing operations aimed at providing homogeneous structure of metals, particularly, in ferrous and non-ferrous metallurgy.

scholarly journals Size-dependent phase diagrams of metallic alloys: A Monte Carlo simulation study on order–disorder transitions in Pt–Rh nanoparticles

2012 ◽  
Vol 3 ◽  
pp. 1-11 ◽  
Author(s):  
Johan Pohl ◽  
Christian Stahl ◽  
Karsten Albe
Keyword(s):  
Monte Carlo ◽  
Phase Diagrams ◽  
Short Range ◽  
Short Range Order ◽  
Surface Segregation ◽  
Order Parameters ◽  
Range Order ◽  
Platinum Concentration ◽  
Monte Carlo Simulation Study ◽  
Size Dependent

Nanoparticles of Pt–Rh were studied by means of lattice-based Monte Carlo simulations with respect to the stability of ordered D022- and 40-phases as a function of particle size and composition. By thermodynamic integration in the semi-grand canonical ensemble, phase diagrams for particles with a diameter of 7.8 nm, 4.3 nm and 3.1 nm were obtained. Size-dependent trends such as the lowering of the critical ordering temperature, the broadening of the compositional stability range of the ordered phases, and the narrowing of the two-phase regions were observed and discussed in the context of complete size-dependent nanoparticle phase diagrams. In addition, an ordered surface phase emerges at low temperatures and low platinum concentration. A decrease of platinum surface segregation with increasing global platinum concentration was observed, when a second, ordered phase is formed inside the core of the particle. The order–disorder transitions were analyzed in terms of the Warren–Cowley short-range order parameters. Concentration-averaged short-range order parameters were used to remove the surface segregation bias of the conventional short-range order parameters. Using this procedure, it was shown that the short-range order in the particles at high temperatures is bulk-like.

Mathematical Modeling of the Magnetic Field Effect on Molten Iron Crystallization

2020 ◽  
Vol 861 ◽  
pp. 519-523
Author(s):  
Nataliy Arkulis ◽  
Mikhail Arkulis ◽  
Oxana S. Logunova ◽  
Yuri Savchenko ◽  
Denis Dolgushin
Keyword(s):  
Magnetic Field ◽  
Energy Function ◽  
Short Range ◽  
Short Range Order ◽  
Magnetic Field Effect ◽  
Molten Iron ◽  
Range Order ◽  
Melt Crystallization ◽  
Simulation Results ◽  
The Magnetic Field

The aim of the study is to construct a mathematical model to describe the effect of a magnetic field on the melt crystallization, in particular cast iron. The authors’ research is based on the hypothesis of the certain energy function existence in the short-range order region, which describes the equilibrium state of the "fluid - short-range order" thermodynamic system. Using the hypothesis, we simulated the effect of a magnetic field on the melt crystallization process, which is based on the fundamental laws of statistical physics and thermodynamics and includes four components: a model of the stationary state of the short-range order region, a model for determining the energy function of the short-range order region, a model of the effect of a proportional magnetic field, a model the effects of a commensurate magnetic field on the crystallization of molten iron. Being based on the simulation results, test calculations were performed, the results of which are confirmed by previously known studies. The simulation results showed that the influence of a magnetic field on the crystallization of melts is insignificant in comparison with thermal motion. The authors of the work believe that the magnetic field acts on the region of short-range order at the formation time at a fluctuation temperature that is much lower than the equilibrium one.

Short Range Order of Spins in Cu(NO3)22.5H2O under Magnetic Field

1970 ◽  
Vol 29 (3) ◽  
pp. 663-666 ◽  
Author(s):  
Masashi Tachiki ◽  
Takemi Yamada ◽  
Sadamichi Maekawa
Keyword(s):  
Magnetic Field ◽  
Short Range ◽  
Short Range Order ◽  
Range Order

Short-range order effects in amorphous FexSi1-x/Si multilayers induced by preparation conditions

1998 ◽  
Vol 08 (PR2) ◽  
pp. Pr2-175-Pr2-178 ◽  
Author(s):  
G. T. Pérez ◽  
F. H. Salas ◽  
R. Morales ◽  
L. M. Álvarez-Prado ◽  
J. M. Alameda
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Order Effects ◽  
Preparation Conditions
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