Ferrimagnetic phase transition in the system Li0.5Fe2.52−x GaxO4 in the vicinity of the multicritical point of the x-T phase diagram

1998 ◽  
Vol 87 (6) ◽  
pp. 1122-1128 ◽  
Author(s):  
N. N. Efimova ◽  
M. B. Ustimenkova
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Multicritical Point ◽  
Ferrimagnetic Phase ◽  
T Phase

scholarly journals Негейзенберговский ферримагентик с одноионной анизотропией

2022 ◽  
Vol 64 (3) ◽  
pp. 337
Author(s):  
О.А. Космачев ◽  
Е.А. Ярыгина ◽  
Я.Ю. Матюнина ◽  
Ю.А. Фридман
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Exchange Interaction ◽  
Order Parameters ◽  
Easy Plane ◽  
Heisenberg Exchange ◽  
Ferrimagnetic Phase ◽  
Tensor Order ◽  
Plane Type

We have investigated the effect of single-ion anisotropy of the "easy plane" type on the phase states of a ferrimagnet with S = 1 and σ=1/2 sublattices and non-Heisenberg (bilinear and biquadratic in spins) exchange interaction for the sublattice with S = 1. It is shown that taking into account both the non-Heisenberg exchange interaction and the single-ion anisotropy of the sublattice with S = 1 leads to the realization of a phase with vector order parameters (ferrimagnetic phase) and a phase characterized by both vector and tensor order parameters (quadrupole-ferrimagnetic). It is shown that taking into account single-ion anisotropy changes the type of phase transition in comparison with an isotropic non-Heisenberg ferrimagnet. A phase diagram is constructed, and the condition for the compensation of the sublattice spins is determined.

scholarly journals Phase diagram of (Na0.5K0.5)NbO3-(Bi0.5Na0.5)ZrO3 solid solution

2016 ◽  
Vol 06 (02) ◽  
pp. 1650014 ◽  
Author(s):  
Ruiping Wang ◽  
Mitsuru Itoh
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Solid Solution ◽  
Dielectric Constant ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
A Site ◽  
T Phase ◽  
O Phase

Phase diagram of [Formula: see text]Na[Formula: see text]K[Formula: see text]NbO3–x(Bi[Formula: see text]Na[Formula: see text]ZrO3 solid solution has been established from dielectric constant measurements and structure analyses. It is found that with increasing x, the C–T phase transition temperature [Formula: see text] and the T–O phase transition temperature [Formula: see text] decrease, while the [Formula: see text] phase transition temperature [Formula: see text] increases. [Formula: see text] of NKN–xBNZ is much different from that of NKN–xBZ solid solution. The result could be mainly elucidated by the hybridization between the A-site ion and oxygen.

THE p-T PHASE DIAGRAM OF OXYGEN DETERMINED BY RAMAN SCATTERING

1984 ◽  
Vol 45 (C8) ◽  
pp. C8-195-C8-198
Author(s):  
H. D. Hochheimer ◽  
H. J. Jodl ◽  
F. Bolduan
Keyword(s):  
Phase Diagram ◽  
Raman Scattering ◽  
T Phase

scholarly journals Electric properties of olive oil under pressure

2021 ◽  
Author(s):  
L. T. Pawlicki ◽  
R. M. Siegoczyński ◽  
S. Ptasznik ◽  
K. Marszałek
Keyword(s):  
Molecular Structure ◽  
Phase Transition ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Olive Oil ◽  
Material Parameters ◽  
First Order ◽  
Long Time ◽  
Capacitive Reactance ◽  
First Order Phase

AbstractThe main purpose of the experiment was a thermodynamic research with use of the electric methods chosen. The substance examined was olive oil. The paper presents the resistance, capacitive reactance, relative permittivity and resistivity of olive. Compression was applied with two mean velocities up to 450 MPa. The results were shown as functions of pressure and time and depicted on the impedance phase diagram. The three first order phase transitions have been detected. All the changes in material parameters were observed during phase transitions. The material parameters measured turned out to be the much more sensitive long-time phase transition factors than temperature. The values of material parameters and their dependence on pressure and time were compared with the molecular structure, arrangement of molecules and interactions between them. Knowledge about olive oil parameters change with pressure and its phase transitions is very important for olive oil production and conservation.

Rem and Rheed Studies of Pb Adsorption on Si(111)

1992 ◽  
Vol 280 ◽  
Author(s):  
Yasumasa Tanishiro ◽  
Masahiko Fukuyamaand ◽  
Katsumichi Yagi
Keyword(s):  
Phase Transition ◽  
Heat Treatment ◽  
Phase Diagram ◽  
Surface Structures ◽  
Structure Changes ◽  
Incommensurate Structures

ABSTRACTStructure changes of Si(111)-Pb surfaces due to deposition and heat treatment are studied by REM-RHEED. Surface structures observed are summarized as a phase diagram. Formation of an incommensurate layer(α) and a phase transition between incommensurate structures of α and α' is described.

scholarly journals SUPERCONDUCTING PHASE TRANSITION IN THE NAMBU–JONA-LASINIO MODEL

2001 ◽  
Vol 16 (17) ◽  
pp. 1129-1138 ◽  
Author(s):  
M. SADZIKOWSKI
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Superconducting Phase ◽  
Coupling Constants ◽  
Coupling Constant ◽  
Rich Phase ◽  
Quark Interaction ◽  
Quark Coupling ◽  
Superconducting Phase Transition

The Nambu–Bogoliubov–de Gennes method is applied to the problem of superconducting QCD. The effective quark–quark interaction is described within the framework of the Nambu–Jona-Lasinio model. The details of the phase diagram are given as a function of the strength of the quark–quark coupling constant G′. It is found that there is no superconducting phase transition when one uses the relation between the coupling constants G′ and G of the Nambu–Jona-Lasinio model which follows from the Fierz transformation. However, for other values of G′ one can find a rich phase structure containing both the chiral and the superconducting phase transitions.

Tricritical point in the p-T phase diagram of Ag2HgI4

1988 ◽  
Vol 28-30 ◽  
pp. 194-199 ◽  
Author(s):  
Bogdan Baranowski ◽  
Milan Friesel ◽  
Arnold Lundén
Keyword(s):  
Phase Diagram ◽  
Tricritical Point ◽  
T Phase

scholarly journals On SU(3) Effective Models and Chiral Phase Transition

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Abdel Nasser Tawfik ◽  
Niseem Magdy
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Lattice Qcd ◽  
High Energy ◽  
Particle Model ◽  
Chiral Phase ◽  
Chiral Phase Transition ◽  
Thermal Models ◽  
Qcd Phase Diagram ◽  
Freeze Out

Sensitivity of Polyakov Nambu-Jona-Lasinio (PNJL) model and Polyakov linear sigma-model (PLSM) has been utilized in studying QCD phase-diagram. From quasi-particle model (QPM) a gluonic sector is integrated into LSM. The hadron resonance gas (HRG) model is used in calculating the thermal and dense dependence of quark-antiquark condensate. We review these four models with respect to their descriptions for the chiral phase transition. We analyze the chiral order parameter, normalized net-strange condensate, and chiral phase-diagram and compare the results with recent lattice calculations. We find that PLSM chiral boundary is located in upper band of the lattice QCD calculations and agree well with the freeze-out results deduced from various high-energy experiments and thermal models. Also, we find that the chiral temperature calculated from HRG is larger than that from PLSM. This is also larger than the freeze-out temperatures calculated in lattice QCD and deduced from experiments and thermal models. The corresponding temperature and chemical potential are very similar to that of PLSM. Although the results from PNJL and QLSM keep the same behavior, their chiral temperature is higher than that of PLSM and HRG. This might be interpreted due the very heavy quark masses implemented in both models.

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