Electronic Structure of Epitaxial Silicon Interfaces

1990 ◽  
Vol 193 ◽  
Author(s):  
Hideaki Fujitani ◽  
Setsuro Asano
Keyword(s):  
Electronic Structure ◽  
Schottky Barrier ◽  
Barrier Height ◽  
Atomic Structure ◽  
Schottky Barrier Height ◽  
Orbital Method ◽  
Epitaxial Silicon ◽  
Atomic Sphere ◽  
Sphere Approximation ◽  
Atomic Sphere Approximation

ABSTRACTUsing the linear muffin-tin orbital method in the atomic sphere approximation (LMTO-ASA), we studied the electronic structure of the Si(111) interface for four different materials: CaF2, NiSi2, CoSi2, and YSi2. We examined how the interface states and Schottky barrier height depend on the interface atomic structure.

Electronic Structure and Energetics of LaNi5, α-La2Ni10H and β-La2Ni10H14

1998 ◽  
Vol 513 ◽  
Author(s):  
H. Nakamura ◽  
D. Nguyen-Manh ◽  
D. G. Pettifor
Keyword(s):  
Electronic Structure ◽  
Total Energy ◽  
Charge Density ◽  
Tight Binding ◽  
Site Occupancy ◽  
Heat Of Formation ◽  
Hydrogen Atoms ◽  
Atomic Sphere ◽  
Sphere Approximation ◽  
Atomic Sphere Approximation

ABSTRACTThe electronic structure and energetics of LaNi5, its hydrogen solution (α-La2Ni10H) and its hydride (β-La2Ni10H14) were investigated by means of the tight-binding linear muffin-tin orbitals method within the atomic sphere approximation (TB-LMTO-ASA). Preferred site occupancy by the absorbed hydrogen atoms was investigated in terms of the charge density of the interstitial sites and the total energy, both of which indicate that the 6m site in the P6/mmm symmetry is the most preferred. A negative heat of formation of La2Ni10H14 was obtained from the total energy calculations.

ELECTRONIC STRUCTURE OF THE PEROVSKITE OXIDES SrCrO3 AND PbCrO3

1992 ◽  
Vol 06 (02) ◽  
pp. 103-112 ◽  
Author(s):  
S. MATHI JAYA ◽  
R. JAGADISH ◽  
R.S. RAO ◽  
R. ASOKAMANI
Keyword(s):  
Electronic Structure ◽  
Good Description ◽  
Perovskite Oxides ◽  
Orbital Method ◽  
Atomic Sphere ◽  
Calculated Magnetic Moment ◽  
Sphere Approximation ◽  
Quantitative Results ◽  
Structure Calculations ◽  
Good Agreement

The electronic structure calculations of the perovskite oxides SrCrO 3 and PbCrO 3 performed both in the paramagnetic and antiferromagnetic phases are reported here. The calculations were carried out using the Linear Muffin Tin Orbital method within the Atomic Sphere Approximation. The quantitative results obtained are found to give a good description of the electronic states of SrCrO 3 and are in agreement with the Goodenough’s qualitative chemical picture. However, it is not able to predict the semiconducting gap in PbCrO 3 which is an antiferromagnetic semiconductor. But the value of the theoretically calculated magnetic moment at the Cr site in PbCrO 3 is found to be in good agreement with the experimentally observed value. The calculations show strong hybridisation between the Cr -3d and O -2p orbitals and the density of states at the Fermi energy has major contributions from these hybridised orbitals.

Effect of Substitutions at the Nickel Site on the Electronic Structure of LaNi5 and its Hydrides

1998 ◽  
Vol 513 ◽  
Author(s):  
M. Gupta
Keyword(s):  
Electronic Structure ◽  
P Element ◽  
Atomic Sphere ◽  
P Elements ◽  
Self Consistent ◽  
Lmto Method ◽  
Sphere Approximation ◽  
Ni Substitution ◽  
Atomic Sphere Approximation ◽  
The Stability

ABSTRACTThe effect of Ni substitution in LaNi5 by 3d and s-p elements on the electronic structure of the intermetallic and its hydrides has been investigated using the self consistent linear muffin tin orbital (LMTO) method in the atomic sphere approximation (ASA). The Fermi level, EF, of LaNi4M (M = Fe,Co,Mn) is found to lie in the narrow additional M 3d subband above the Ni d states, leading to an increase in the density of states (DOS) at EF. In contrast, the substitution of Ni by an s element of the 3d series, Cu, or by an s-p element: Al or Sn results in a progressive filling of the Ni-d bands and in a decrease of the DOS at EF. In all the substituted intermetallic compounds, we find that the lattice expansion accounts for less than 50% of the observed decreased stability, this shows the importance of the effect of chemical substitution. We also discuss the factors which affect the electronic structure and the stability of the hydrides and compare our results with available experimental data.

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