scholarly journals An efficient algorithm for classical density functional theory in three dimensions: Ionic solutions

2010 ◽  
Vol 132 (12) ◽  
pp. 124101 ◽  
Author(s):  
Matthew G. Knepley ◽  
Dmitry A. Karpeev ◽  
Seth Davidovits ◽  
Robert S. Eisenberg ◽  
Dirk Gillespie
Keyword(s):  
Density Functional Theory ◽  
Efficient Algorithm ◽  
Density Functional ◽  
Three Dimensions ◽  
Functional Theory ◽  
Ionic Solutions

Density functional theory (DFT) study of BaScO3H0.5 compound and its hydrogen storage properties

2019 ◽  
Vol 97 (11) ◽  
pp. 1191-1199 ◽  
Author(s):  
Aysenur Gencer ◽  
Gokhan Surucu
Keyword(s):  
Density Functional Theory ◽  
Hydrogen Storage ◽  
Density Functional ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Stable Phase ◽  
Partial Density ◽  
Functional Theory ◽  
Hydrogen Storage Properties ◽  
Storage Properties

BaScO3 and its hydride BaScO3H0.5 have been investigated using density functional theory (DFT) with the generalized gradient approximation (GGA). BaScO3 perovskite can crystallize in five possible crystal structures: orthorhombic (Pnma), tetragonal (P4mm), rhombohedral (R-3c), hexagonal (P63/mmc), and cubic (Pm-3m). These five possible phases have been optimized to obtain the most stable phase of BaScO3. The orthorhombic phase, being the most stable and having the lowest volume among the studied phases, has been considered for hydrogen bonding studies, and BaScO3H0.5 has been obtained. The electronic properties including band structure and corresponding partial density of states have been obtained for both BaScO3 and BaScO3H0.5 compounds. In addition, partial charge analysis has been performed. The calculated elastic constants have been used to obtain mechanical properties, such as bulk modulus, shear modulus, Young’s modulus, and Poisson’s ratio. Also, direction-dependent elastic properties have been studied in two dimensions and three dimensions. BaScO3 and BaScO3H0.5 compounds have ionic bonding and they are ductile materials. Moreover, the hydrogen storage properties of BaScO3H0.5 have been investigated and it is found that the gravimetric hydrogen storage capacity is 0.22 wt% and the hydrogen desorption temperature is determined as 1769.70 K.

scholarly journals Highly efficient evaluation of diffusion networks in Li ionic conductors using a 3D-corrugation descriptor

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Arthur France-Lanord ◽  
Ryoji Asahi ◽  
Benoît Leblanc ◽  
Joohwi Lee ◽  
Erich Wimmer
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Density Functional Theory Calculation ◽  
Topological Analysis ◽  
Ion Conductivity ◽  
Three Dimensions ◽  
Ionic Conductors ◽  
Functional Theory ◽  
Highly Efficient ◽  
Li Ion

Abstract A highly efficient computational approach for the screening of Li ion conducting materials is presented and its performance is demonstrated for olivine-type oxides and thiophosphates. The approach is based on a topological analysis of the electrostatic (Coulomb) potential obtained from a single density functional theory calculation augmented by a Born-Mayer-type repulsive term between Li ions and the anions of the material. This 3D-corrugation descriptor enables the automatic determination of diffusion pathways in one, two, and three dimensions and reproduces migration barriers obtained from density functional theory calculations using nudged elastic band method within approximately 0.1 eV. Importantly, it correlates with Li ion conductivity. This approach thus offers an efficient tool for evaluating, ranking, and optimizing materials with high Li-ion conductivity.

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