Abstract
Neutron diffraction data for SrxBa1-xSnO3 (x=0.0, 0.2, 0.4, 0.6, 0.8 and
1.0) solid solutions were used as inputs to obtain optimized geometries
and electronic properties using the density functional theory (DFT)
formalism considering both the local density and generalized gradient
approximations, LDA and GGA, respectively. The crystal structures and
SnO6 octahedra tilting angles found after total energy minimization
agree well with experiment, specially for the GGA data. Elastic
constants were also obtained and compared with theoretical and
experimental results for cubic BaSnO3. While the alloys with cubic unit
cell have an indirect band gap, tetragonal and orthorhombic alloys exhibit direct band gaps (exception made to x=1.0). The Kohn-Sham minimum electronic band gap oscillates from 1.52 eV (cubic x=0.0, LDA) to 2.61 eV (orthorhombic x=1.0, LDA), and from 0.74 eV (cubic BaSnO3,
GGA) to 1.97 eV (orthorhombic SrSnO3, GGA). Parabolic interpolation of
bands has allowed us to estimate the effective masses for charge
carriers, which are shown to be anisotropic and larger for holes. (C)
2012 Elsevier Inc. All rights reserved.
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