Investigation of structural and dynamic properties in α -PbO2 phase of SnO2 under pressure
Abstract
SnO2 has various specific and unique properties, which make this material very useful for many
applications. The elastic constants of materials are very important because they are closely associated
with the mechanical, physical and chemical properties. The structural and elastic constants of SnO2 were
investigated using density functional theory (DFT) as implemented in VASP software. The lattice
parameters, atomic positions and elastic constants were studied up to pressure of 18 GPa. The calculated
elastic constants indicate that SnO2 is mechanically stable. Some fundamental physical quantities such as
bulk modulus, Debye temperature, Poisson’s ratio, Young's modulus, shear modulus, and crystal
anisotropy were derived calculated data. The phase transition from CaCl2 – type to α-PbO2 structure is
obtained at 12.13 GPa. The Debye temperature of SnO2 was computed from the elastic moduli and sound
velocities. The computed average linear compressibility of α-PbO2 structure is 1.90 TPa-1 in the x, y and z
direction at ambient pressure. Also, the pressure-induced lattice (elastic) constants were fitted to the
regression equation in order to make direct comparison to results obtained by other calculations. The
results were compared with available theoretical and experimental data.
Keywords
References
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Details
Primary Language
English
Subjects
Metrology, Applied and Industrial Physics
Journal Section
Research Article
Publication Date
June 1, 2017
Submission Date
October 7, 2016
Acceptance Date
January 31, 2017
Published in Issue
Year 2017 Volume: 21 Number: 3