Temperature-dependent pitch and phase diagram for incommensurateXYspins in a slab geometry

1996 ◽  
Vol 53 (13) ◽  
pp. 8533-8538 ◽  
Author(s):  
M. Collins ◽  
W. M. Saslow
Keyword(s):  
Phase Diagram ◽  
Temperature Dependent ◽  
Slab Geometry

scholarly journals Temperature Dependence of Dielectric Properties of Ferroelectric Heterostructures with Domain-Provided Negative Capacitance

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 75
Author(s):  
Maksim A. Pavlenko ◽  
Yuri A. Tikhonov ◽  
Anna G. Razumnaya ◽  
Valerii M. Vinokur ◽  
Igor A. Lukyanchuk
Keyword(s):  
Phase Diagram ◽  
Dielectric Properties ◽  
Temperature Dependence ◽  
Energy Efficient ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Negative Capacitance ◽  
Temperature Dependent ◽  
Domain Structures ◽  
Temperature Dependent Properties

It is well known that the ferroelectric layers in dielectric/ferroelectric/dielectric heterostructures harbor polarization domains resulting in the negative capacitance crucial for manufacturing energy-efficient field-effect transistors. However, the temperature behavior of the characteristic dielectric properties, and, hence, the corresponding behavior of the negative capacitance, are still poorly understood, restraining the technological progress thereof. Here we investigate the temperature-dependent properties of domain structures in the SrTiO3/PbTiO3/SrTiO3 heterostructures and demonstrate that the temperature–thickness phase diagram of the system includes the ferroelectric and paraelectric regions, which exhibit different responses to the applied electric field. Using phase-field modeling and analytical calculations we find the temperature dependence of the dielectric constant of ferroelectric layers and identify the regions of the phase diagram wherein the system demonstrates negative capacitance. We further discuss the optimal routes for implementing negative capacitance in energy-efficient ferroelectric field-effect transistors.

HELIUM ON NANOPATTERNED SURFACES AT FINITE TEMPERATURE

2010 ◽  
Vol 24 (25n26) ◽  
pp. 4915-4922
Author(s):  
E. S. HERNANDEZ ◽  
F. ANCILOTTO ◽  
M. BARRANCO ◽  
A. HERNANDO ◽  
M. PI
Keyword(s):  
Phase Diagram ◽  
Density Functional Theory ◽  
Alkali Metal ◽  
Density Functional ◽  
Finite Range ◽  
Temperature Dependent ◽  
Functional Theory ◽  
Infinite Array ◽  
Dependent Density

We investigate the wetting behavior of helium on nanostructured alkali metal surfaces, at temperatures below and slightly above the bulk superfluidity threshold. Starting from a determination of the phase diagram of helium on semiinfinite planar Cs up to 3 K, performed within finite–range, temperature–dependent density functional theory, we examine the modifications of the isotherms introduced by an infinite array of nanocavities. We compare the hysterectic loops of helium on nonwettable Cs surfaces and on wettable Na substrates in the same temperature range.

Phase Diagram of the Topological Superfluid 3He Confined in a Nanoscale Slab Geometry

Science ◽  
2013 ◽  
Vol 340 (6134) ◽  
pp. 841-844 ◽  
Author(s):  
L. V. Levitin ◽  
R. G. Bennett ◽  
A. Casey ◽  
B. Cowan ◽  
J. Saunders ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Superfluid 3He ◽  
Slab Geometry ◽  
Topological Superfluid

scholarly journals Vortex phase diagram and temperature-dependent second-peak effect in overdopedBi2Sr2CuO6+δcrystals

2010 ◽  
Vol 81 (14) ◽  
Author(s):  
A. Piriou ◽  
E. Giannini ◽  
Y. Fasano ◽  
C. Senatore ◽  
Ø. Fischer
Keyword(s):  
Phase Diagram ◽  
Peak Effect ◽  
Temperature Dependent ◽  
Vortex Phase Diagram ◽  
Vortex Phase ◽  
Second Peak

Temperature and composition dependent phase transitions of lead-free piezoelectric (Bi0.5Na0.5)TiO3–BaTiO3 thin films

2017 ◽  
Vol 19 (30) ◽  
pp. 19992-19997 ◽  
Author(s):  
Zhen Zhou ◽  
Jin Luo ◽  
Wei Sun ◽  
Jing-Feng Li
Keyword(s):  
Thin Films ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Lead Free ◽  
Structure And Properties ◽  
Temperature Dependent

Composition and temperature dependent transitions of structure and properties of BNT–BT films were discussed and a phase diagram was proposed.

scholarly journals Effects of Sample Shapes and Thickness on Distribution of Temperature inside the Mineral Ilmenite Due to Microwave Heating

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 382
Author(s):  
Mas Irfan P. Hidayat ◽  
Dian M. Felicia ◽  
Ferdiansyah I. Rafandi ◽  
Affiani Machmudah
Keyword(s):  
Microwave Heating ◽  
Maximum Temperature ◽  
Thickness Variation ◽  
Temperature Dependent ◽  
Fe Method ◽  
Slab Geometry ◽  
Conservation Of Energy ◽  
Good Trade ◽  
Poynting Theorem ◽  
Innovative Techniques

The study of interaction between microwave radiation and minerals is gaining increasing interest in the field of minerals and material processing. Further studies are, however, still required to deepen the understanding of such microwave heating mechanisms in order to develop innovative techniques for mineral treatment using microwave heating. In this paper, effects of sample shapes and thickness on the distribution of temperature inside the mineral ilmenite (FeTiO3) due to microwave heating were numerically studied using the finite element (FE) method. The analysis was carried out in such a way that the flux of microwave energy was converted into an equivalent amount of heat generation in the mineral through the Poynting theorem of conservation of energy for the electromagnetic field. In this study, as a first attempt, the cylinder and slab of ilmenite were modeled to be irradiated from top and bottom surfaces with the variation of cylinder and slab thicknesses. Temperature-dependent material properties of ilmenite were taken into account in the FE simulation. Corresponding boundary conditions were then applied accordingly to the cylinder and slab of ilmenite with comparable characteristic length. Numerical results showed that, in terms of temperature differences between locations having maximum and minimum temperatures, slab geometries tended to produce higher values in comparison to those of cylinder geometries with the thickness variation, while the profiles of temperature inside the ilmenite samples were similar for both geometries. For the same duration of microwave heating, the slab geometry, hence, induced greater non-uniformity of temperature inside the ilmenite. It was also observed that, for the ilmenite samples with thickness value greater than 1.5 cm, the hotspot locations were not in the center of the sample, but on the surface of sample. Moreover, from several thickness values considered in this study, the ilmenite sample with thickness value of 3 cm gave a good trade-off between the maximum temperature value attained and temperature differences inside the sample, for both geometries. Thus, the shape and thickness of ilmenite samples affect the effectiveness of microwave heating of ilmenite, in terms of maximum temperature attained, temperature differences, and uniformity of temperature.

Modelling of Phase Diagram Boundaries at Equilibrium of Two Binary Regular Phases

1995 ◽  
Vol 60 (6) ◽  
pp. 911-916
Author(s):  
Jan Vřešťál ◽  
Ivo Stloukal
Keyword(s):  
Phase Diagram ◽  
Linear Function ◽  
Regular Solution ◽  
Gibbs Function ◽  
Temperature Dependent ◽  
Regular Solutions ◽  
Liquid Phases ◽  
Simplifying Assumptions ◽  
Two Phases ◽  
Solution Parameter

The conditions of occurrence of extremes on the solidus and liquidus curves in a binary isobaric phase diagram are specified. The solid and liquid phases are regarded as regular solutions in equilibrium. Two simplifying assumptions are made: (i) the Gibbs function of melting of the pure components is a linear function of temperature; (ii) the two phases in equilibrium are regular solutions with a temperature-dependent regular solution parameter. The conditions of occurrence of inflexion points on the solidus and/or liquidus curves are obtained by modelling.

Magnetic phase diagram and temperature dependent Ising-axis conversion of DyCu2 single crystals

1998 ◽  
Vol 246-247 ◽  
pp. 472-475 ◽  
Author(s):  
M. Loewenhaupt ◽  
M. Doerr ◽  
L. Jahn ◽  
T. Reif ◽  
C. Sierks ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Single Crystals ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
Temperature Dependent
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