Lattice Dynamics, Dielectric Constants, and Phase Diagram of Bismuth Layered Ferroelectric Bi3 Ti1−x W x NbO9+δ Ceramics

2016 ◽  
Vol 99 (11) ◽  
pp. 3610-3615 ◽  
Author(s):  
Jinzhong Zhang ◽  
Kai Jiang ◽  
Zhiyong Zhou ◽  
Zhigao Hu ◽  
Genshui Wang ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Lattice Dynamics ◽  
Dielectric Constants

scholarly journals Configurational lattice dynamics: The phase diagram ofRh−Pd

2005 ◽  
Vol 71 (14) ◽  
Author(s):  
C. Cienfuegos ◽  
E. P. Isoardi ◽  
G. D. Barrera
Keyword(s):  
Phase Diagram ◽  
Lattice Dynamics

Lattice dynamics and phase diagram of aluminum at high temperatures

2013 ◽  
Vol 117 (4) ◽  
pp. 664-671 ◽  
Author(s):  
Yu. B. Kudasov ◽  
O. M. Surdin ◽  
A. S. Korshunov ◽  
V. N. Pavlov ◽  
N. V. Frolova ◽  
...  
Keyword(s):  
Phase Diagram ◽  
High Temperatures ◽  
Lattice Dynamics

scholarly journals Evolution of Charge-Lattice Dynamics across the Kuramoto Synchronization Phase Diagram of Quantum Tunneling Polarons in Cuprate Superconductors

2021 ◽  
Vol 6 (4) ◽  
pp. 52
Author(s):  
Victor Velasco ◽  
Marcello B. Silva Neto ◽  
Andrea Perali ◽  
Sandro Wimberger ◽  
Alan R. Bishop ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Quantum Tunneling ◽  
Lattice Dynamics ◽  
Cuprate Superconductors ◽  
High Temperature Superconductivity ◽  
Phase Locking ◽  
Dynamic Structure ◽  
Cuo2 Plane ◽  
Kuramoto Model ◽  
Site Distribution

Because of its sensitivity to the instantaneous structure factor, S(Q,t = 0), Extended X-ray Absorption Fine Structure (EXAFS) is a powerful tool for probing the dynamic structure of condensed matter systems in which the charge and lattice dynamics are coupled. When applied to hole-doped cuprate superconductors, EXAFS has revealed the presence of internal quantum tunneling polarons (IQTPs). An IQTP arises in EXAFS as a two-site distribution for certain Cu–O pairs, which is also duplicated in inelastic scattering but not observed in standard diffraction measurements. The Cu–Sr pair distribution has been found to be highly anharmonic and strongly correlated to both the IQTPs and to superconductivity, as, for example, in YSr2Cu2.75Mo0.25O7.54(Tc=84 K). In order to describe such nontrivial, anharmonic charge-lattice dynamics, we have proposed a model Hamiltonian for a prototype six-atom cluster, in which two Cu-apical-O IQTPs are charge-transfer bridged through Cu atoms by an O atom in the CuO2 plane and are anharmonically coupled via a Sr atom. By applying an exact diagonalization procedure to this cluster, we have verified that our model indeed produces an intricate interplay between charge and lattice dynamics. Then, by using the Kuramoto model for the synchronization of coupled quantum oscillators, we have found a first-order phase transition for the IQTPs into a synchronized, phase-locked phase. Most importantly, we have shown that this transition results specifically from the anharmonicity. Finally, we have provided a phase diagram showing the onset of the phase-locking of IQTPs as a function of the charge-lattice and anharmonic couplings in our model. We have found that the charge, initially confined to the apical oxygens, is partially pumped into the CuO2 plane in the synchronized phase, which suggests a possible connection between the synchronized dynamic structure and high-temperature superconductivity (HTSC) in doped cuprates.

Quasi harmonic lattice dynamics: the phase diagram of benzene

1996 ◽  
Vol 202 (2-3) ◽  
pp. 231-241 ◽  
Author(s):  
Raffaele Guido Della Valle ◽  
Elisabetta Venuti ◽  
Aldo Brillante
Keyword(s):  
Phase Diagram ◽  
Lattice Dynamics

Deformation and breakup of a leaky dielectric drop in a quadrupole electric field

2013 ◽  
Vol 731 ◽  
pp. 713-733 ◽  
Author(s):  
Shivraj D. Deshmukh ◽  
Rochish M. Thaokar
Keyword(s):  
Phase Diagram ◽  
Electric Field ◽  
Boundary Element ◽  
Dielectric Medium ◽  
Dielectric Constants ◽  
Boundary Element Methods ◽  
Uniform Electric Field ◽  
Quadrupole Field ◽  
Capillary Stress ◽  
Leaky Dielectric

AbstractThe deformation and breakup of a leaky dielectric drop suspended in a leaky dielectric medium subjected to a quadrupole electric field are studied. Analytical (linear and nonlinear asymptotic expansions in the electric capillary number, $C{a}_{Q} $, a ratio of electric to capillary stress) and numerical (boundary element) methods are used. A complete phase diagram for the drop deformation in the $R$–$Q$ plane is presented, where $R$ and $Q$ are the non-dimensional ratios of the resistivities and dielectric constants, respectively, of the drop and the medium phase. The prolate and oblate deformations are mapped in the phase diagram, and the flow contours are also shown. The large deformation and breakup of a drop at higher $C{a}_{Q} $ are analysed using the boundary element method. Several non-trivial shapes are observed at the onset of breakup of a drop. A prolate drop always breaks above a certain critical value of $C{a}_{Q} $. In the oblate deformation cases, breakup as well as steady shapes are observed at a higher value of $C{a}_{Q} $. A detailed study of prolate and oblate deformation tendencies due to the normal and tangential electric stresses and the countervailing role of viscous stresses is presented. The circulation inside a drop is found to be more intense for a quadrupole field as compared with a uniform electric field. More intense internal circulations can lead to enhanced mixing characteristics and will have implications in microfluidic devices.

Cooperative inter- and intra-layer lattice dynamics of photoexcited multi-walled carbon nanotubes studied by ultrafast electron diffraction

Nanoscale ◽  
2018 ◽  
Vol 10 (16) ◽  
pp. 7465-7471 ◽  
Author(s):  
Shuaishuai Sun ◽  
Zhongwen Li ◽  
Zi-An Li ◽  
Ruijuan Xiao ◽  
Ming Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Phase Diagram ◽  
Electron Diffraction ◽  
Lattice Dynamics ◽  
Structural Evolution ◽  
Ultrafast Electron Diffraction ◽  
Temporal Phase ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Temporal phase diagram of reversible structural evolution of photoexcited MWCNTs showing cooperative inter- and intra-layer lattice dynamics.

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