scholarly journals Thermodynamics of thorium substitution in yttrium iron garnet: comparison of experimental and theoretical results

2014 ◽  
Vol 2 (40) ◽  
pp. 16945-16954 ◽  
Author(s):  
X. Guo ◽  
Zs. Rak ◽  
A. H. Tavakoli ◽  
U. Becker ◽  
R. C. Ewing ◽  
...  
Keyword(s):  
Electronic Structure ◽  
First Principles ◽  
Yttrium Iron Garnet ◽  
Electronic Structure Calculations ◽  
Yttrium Iron ◽  
Bearing Material ◽  
Calorimetric Measurements ◽  
Iron Garnet ◽  
Structure Calculations ◽  
Theoretical Results

The thermodynamic stability of Th-doped yttrium iron garnet (Y3Fe5O12, YIG) as a possible actinide-bearing material has been investigated using calorimetric measurements and first-principles electronic-structure calculations.

Effect of Boron and Hydrogen on the Electronic Structure of Ni3Al

1993 ◽  
Vol 319 ◽  
Author(s):  
N. Kioussis ◽  
H. Watanabe ◽  
R.G. Hemker ◽  
W. Gourdin ◽  
A. Gonis ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Charge Density ◽  
First Principles ◽  
Electronic Structure Calculations ◽  
Interstitial Site ◽  
Octahedral Interstitial Site ◽  
Interstitial Region ◽  
Ordered Intermetallic ◽  
Lmto Method ◽  
Structure Calculations

AbstractUsing first-principles electronic structure calculations based on the Linear-Muffin-Tin Orbital (LMTO) method, we have investigated the effects of interstitial boron and hydrogen on the electronic structure of the L12 ordered intermetallic Ni3A1. When it occupies an octahedral interstitial site entirely coordinated by six Ni atoms, we find that boron enhances the charge distribution found in the strongly-bound “pure” Ni3AI crystal: Charge is depleted at Ni and Al sites and enhanced in interstitial region. Substitution of Al atoms for two of the Ni atoms coordinating the boron, however, reduces the interstitial charge density between certain atomic planes. In contrast to boron, hydrogen appears to deplete the interstitial charge, even when fully coordinated by Ni atoms. We suggest that these results are broadly consistent with the notion of boron as a cohesion enhancer and hydrogen as an embrittler.

scholarly journals First principles methods using CASTEP

2005 ◽  
Vol 220 (5/6) ◽  
Author(s):  
Stewart J. Clark ◽  
Matthew D. Segall ◽  
Chris J. Pickard ◽  
Phil J. Hasnip ◽  
Matt I. J. Probert ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Future Development ◽  
First Principles ◽  
Electronic Structure Calculations ◽  
Development Plans ◽  
Near Future ◽  
Structure Calculations

AbstractThe CASTEP code for first principles electronic structure calculations will be described. A brief, non-technical overview will be given and some of the features and capabilities highlighted. Some features which are unique to CASTEP will be described and near-future development plans outlined.

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