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Showing 1 to 20 of 23 for “"Phase Coexistence"”.
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Phase Coexistence in Manganites
… and crystal lattices, and the wide range of phases that can coexist. The region of greatest interest in the bulk material is around x~0.5, where there is often mesoscopic phase coexistence between a ferromagnetic metal (FM) and an antiferromagnetic insulator (AF). The first part of the …
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Resistance Fluctuations and Phase Coexistence in Colossal Magneto-Resistive Manganite Thin Films
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-26T21:48:20Z No. of bitstreams: 1 Palanisami_Akilan.pdf: 8022291 bytes, checksum: 6eef3d3bdf57a3901e25f2a431750bf6 (MD5)
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Computer Modeling and Simulation of Morphotropic Phase Boundary Ferroelectrics
Phase field modeling and simulation is employed to study the underlying mechanism of enhancing electromechanical properties in single crystals and polycrystals of perovskite-type ferroelectrics around the morphotropic phase boundary (MPB). The findings include: (I) Coherent phase decomposition near …
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Monte Carlo simulations of the CO₂/NaCl(001) and CH₃Br/LiF(001) systems
… were used to examine the stable structures, phase coexistence and mechanism of nucleation and growth of films of CO$\sb2$ molecules adsorbed on the (001) surface of NaCl. This was done for submonolayer, monolayer, and multilayer coverages. The results show that the monolayer has two stable …
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Investigations of the Role of Triglycerides in Synthetic Colloidal Systems
… headgroup (the "m" conformation), isotropic oil phases between leaflets, swelling the membrane (referred to as "blisters"), as well as intermediate positions, where their tails interdigitate into the leaflets (the "h" conformation). Inclusion of TGs has been shown to be critical to the success of …
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Lattice modelling of liquid crystal mixtures
… to computer simulation investigations of the phase behaviour of binary and ternary liquid crystals mixtures represented using the LebwohlLasher lattice model. The binary mixture is studied in the Canonical and Semi Grand Canonical Ensembles over a comprehensive set of temperatures, …
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A mean-field method for driven diffusive systems based on maximum entropy principle
… high temperatures as well to the low temperature phase coexistence regime and also has the potential for dealing with first-order phase transitions. At low temperatures the free energy is nonconvex and we use a Maxwell construction to find the relevant information for the system. To test the …
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Percolation and nanosecond fluctuators in V2O3 films within the metal-insulator transition
… rhombohedral, paramagnetic, metallic phase. In thin films, due to strain, the transition takes place over a finite temperature range of phase coexistence. Resistive noise measured through electronic transport is a probe of percolation and the fluctuating dynamics of the two-phase …
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Light scattering studies of magnetostructural phases in Mn3O4 and charge density wave melting in ZrTe3
… is used to study the magnetically ordered phases of magnetodielectric Mn3O4, as well as the pressure-induced charge-ordered to superconducting transition in ZrTe3. In Mn3O4, I examine the differences in magnetic and structural order between two distinct orthorhombic phases which are …
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The role of phase transformation in the rate performance limited Lix̳ V₂ O₅ battery cathode
… with electrochemical discharge often leads to phase transformation. While the consequent phase coexistence is largely responsible for the high energy densities reported in many crystalline insertion hosts, its effect upon rate performance, (or power density), is not well understood. Recently, …
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Molecular Modeling Of Energetic Materials And Chemical Warfare Agents
… force fields are used to determine their phase coexistence properties, vapor pressures, critical parameters, pure and mixture isotherms with water over carbon slit pore using atomistic Monte Carlo simulations.</p>
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Vapor-Liquid Phase Equilibria Using Monte Carlo Wang-Landau Simulations
… of the molecules while in the vapor phase. Therefore molecular simulations stand as an appropriate alternative for determining the critical point and phase coexistence properties of these fluids. Most simulation methods that are apt for this task rely on particles insertion and …
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Hydrodynamic behaviour of active and multi-species exclusion processes
… equation for the particles' density in phase space (positions and orientations) and includes nonlinearities in both the diffusive and advective components. Systems of active particles can undergo phase separation without any attractive interactions, a mechanism known as motility-induced …
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Collective dynamics in lattice models far from equilibrium
… rate. Finally, we analyse motility-induced phase coexistence in a lattice model of self-propelled particles. We compare two-dimensional systems where the dense phase has both slab and droplet geometries. In the slab geometry, we measure the spectrum of the height profile of the liquid-vapour …
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Physical phenomena of thin surface layers
… often form at the film interface prior to phase separation. Here the formation of these wetting layers are seen to result in destabilisation of the film, even when the blend is far from phase coexistence. A spinodal like instability with a characteristic wavelength is shown to form. A …
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Magnetic and electric properties of bismuth ferrite lead titanate ceramics
… mixed tetragonal (P4mm) and rhombohedral (R3c) phase perovskite distortions from 0.4 ≤ x < 0.75, where at x ~ 0.75 a morphotropic phase boundary exists and compositions x > 0.75 are entirely rhombohedral. From extensive use of neutron diffraction experiments, the phase coexistence is attributed …
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The Gutzwiller variational method for strongly correlated systems
… application of pressure leads to a structural phase separation and breaks the material into two blocks composed of domains of undistorted (metallic character) and distorted (insulating character) MnO6 octahedra; both of these findings have been already observed in experiments with no …
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Phase transitions and critical phenomena: Universality and global multicritical phase diagrams from position-space renormalization-group studies
… has given impressive results in studies of phase transitions and critical phenomena. Most work has focussed on the local critical properties of rather simple models. After presenting background on phase transitions and reviewing the PSRG procedure in general, we extend this approach to more …
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Density Fluctuations and Phase Behaviour in Non-Equilibrium Systems
… symmetries. This thesis addresses two types of phase behaviour, each described by dynamical field theories developed via one of the two approaches. The first concerns phase transitions into absorbing states, which are configurations that the system can reach but cannot leave. We focus on a class …
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Motility-induced phases: out-of-equilibrium droplets, surfaces, and survival
… of active matter.</p> <p>Motility-induced phase separation (MIPS) is a unique example of out-of-equilibrium emergent behavior, in which a fluid of active particles with repulsive-only interactions use their motility to spontaneously separate into coexisting dense and dilute phases. In this …
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