https://doi.org/10.1140/epjb/e2009-00250-0
High pressure structural phase transition and elastic properties of Ga1-xInxAs semiconducting compounds
School of Physics, Vigyan Bhawan, Devi Ahilya University, Khandwa Road
Campus, Indore, 452001, India
Corresponding author: a vdinesh33@rediffmail.com
Received:
12
February
2009
Revised:
5
June
2009
Published online:
21
July
2009
The present paper addresses the high-pressure phase transformation and mechanical properties of Ga1-xInxAs (x = 0.25, 0.5 and 0.75) by formulating an effective interionic interaction potential. This potential consists of the long-range Coulomb and charge transfer caused by the deformation of the electron shells of the overlapping ions and the Hafemeister and Flygare type short-range overlap repulsion extended upto the second neighbor ions and the van der Waals (vdW) interaction. The estimated values of phase transition pressure and the vast volume discontinuity in pressure-volume (PV) phase diagram indicate the structural phase transition from zinc blende (B3) to rock salt (B1). The equation of state curves plotted between V (P)/ V (0) and pressure are for both the zincblende (B3) and rocksalt (B1) structures. Further, the variations of the second and third order elastic constants with pressure have followed a systematic trend, which are almost identical to those exhibited by the observed data measured for other compounds of this family.
PACS: 61.50.Ah – Theory of crystal structure, crystal symmetry; calculations and modeling / 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 62.20.-x – Mechanical properties of solids
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009