Crystal structure, oxygen nonstoichiometry and diffusion mobility in some ferrites-nickelites

2012 ◽  
Author(s):  
V. Vashook ◽  
J. Rebello ◽  
J.-Y. Chen ◽  
L. Vasylechko ◽  
D. Trots ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Oxygen Nonstoichiometry ◽  
Diffusion Mobility ◽  
And Diffusion

Thermal Expansion, Oxygen Non-Stoichiometry and Diffusion Mobility in some Ferrites-Nickelites

2013 ◽  
Vol 200 ◽  
pp. 86-92 ◽  
Author(s):  
Vladimir Vashook ◽  
Jean Rebello ◽  
J.Y. Chen ◽  
Leonid Vasylechko ◽  
Dmytro Trots ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Oxygen Diffusion ◽  
Oxygen Exchange ◽  
Diffusion Mobility ◽  
Diffusion Characteristics ◽  
And Diffusion

Crystal structure,thermal expansion, oxygen non-stoichiometry, electrical conductivity and diffusion characteristics of two analogous LaFe0.7Ni0.3O3‑d and PrFe0.7Ni0.3O3‑d compositions were investigated depending on temperature (201000 °C) and oxygen partial pressure (0.6–21000 Pa). The found oxygen diffusion and oxygen exchange coefficients for the both compositions at similar conditions are near to each other and varied in the range of 110‑7110‑5 cm2s‑1 and 510‑6110‑4 cms‑1, respectively.

Crystal structure, oxygen nonstoichiometry and thermal expansion of ordered Y2Ba3Fe3.1Co1.9O13+δ

2019 ◽  
Vol 251 ◽  
pp. 78-80
Author(s):  
A.S. Urusova ◽  
A.V. Bryuzgina ◽  
M.Yu. Mychinko ◽  
A.S. Vizner ◽  
V.A. Cherepanov
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Oxygen Nonstoichiometry

Crystal structure, oxygen nonstoichiometry, thermal expansion and conductivity of (Nd,Sr)(Fe,Co)O 3−δ oxides

2016 ◽  
Vol 295 ◽  
pp. 96-103 ◽  
Author(s):  
Sh.I. Elkalashy ◽  
T.V. Aksenova ◽  
A.S. Urusova ◽  
V.A. Cherepanov
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Oxygen Nonstoichiometry

Computer Simulation of Xe adsorption in Zeolite Y

1996 ◽  
Vol 431 ◽  
Author(s):  
Vishwas Gupta ◽  
H. Ted Davis ◽  
Alon V. McCormick
Keyword(s):  
Crystal Structure ◽  
Computer Simulation ◽  
Computer Modeling ◽  
Potential Field ◽  
Molecular Level ◽  
Zeolite Y ◽  
Strong Link ◽  
Adsorption Sites ◽  
Commercially Important ◽  
And Diffusion

AbstractComputer modeling of fluids in zeolites can provide a detailed molecular level understanding of the process of adsorption and diffusion under the influence of the 3-D potential field and the confinement offered by the crystal structure. We have shown that there is a strong link between the location, geometry and energetics of sites and the observed thermodynamics and spectroscopy of the adsorbates. Here we report on the modeling of Xe in zeolite Y, which is of interest both because it is commercially important and because it offers two distinct adsorption sites.

Simulation of Atomic Structure and Diffusion Characteristics of Point Defects in BCC and FCC Metals

2011 ◽  
Vol 172-174 ◽  
pp. 1222-1227 ◽  
Author(s):  
Irina Valikova ◽  
Andrei V. Nazarov
Keyword(s):  
Point Defect ◽  
Point Defects ◽  
Atomic Structure ◽  
Recent Model ◽  
Diffusion Mobility ◽  
Effect Of Pressure ◽  
Fcc Metals ◽  
Diffusion Characteristics ◽  
Temperature Dependences ◽  
And Diffusion

Our recent model has been used to evaluate the point defect characteristics including those determining the effect of pressure on the concentration of vacancies, di-vacancies, interstitials and their diffusion mobility in set of BCC and FCC metals. Our model has been developed to calculate temperature dependences of mentioned features. In contrast to other studies, the vacancy migration volumes have been found for all the metals studied.

A dynamical model of a crystal structure - IV. Grain boundaries

1952 ◽  
Vol 212 (1111) ◽  
pp. 576-584 ◽  
Keyword(s):  
Crystal Structure ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Large Angle ◽  
Gradual Transition ◽  
Small Angle Boundary ◽  
Pure Metals ◽  
And Diffusion ◽  
Large Angle Boundary ◽  
Dislocation Walls

Four photographs of bubble rafts are used as a basis for discussion of the structure of grain boundaries in pure metals. In these photographs one can follow the gradual transition from a small-angle boundary made up of clearly separate dislocations to a large-angle boundary where the dislocation structure is hardly recognizable. As the angle is increased, a continuous shortening of the dislocations, accompanied by the widening of a crack on the tensile side, is seen, and the process culminates in a structure which is perhaps best described in terms of local fit and misfit. The fact is also illustrated that the dislocation content of the boundary depends on the angle of the boundary, as well as on the disorientation of the crystals that it separates. If a boundary turns it must therefore gain or lose dislocations. The bearing of this on the measurement of grain-boundary energies is discussed. Other points considered concern the range of validity of calculations of the energy of dislocation walls, and slip and diffusion along grain boundaries.

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