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oa Lattice Dynamical Study of Platinum by use of Van der Waals Three Body Force Shell Model
Good agreement between experimental and theoretical results
- Source: Johnson Matthey Technology Review, Volume 65, Issue 1, Jan 2021, p. 87 - 93
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- 01 Jan 2021
Abstract
The present article considers the lattice dynamical study of platinum by use of the Van der Waals three body force shell model (VTBFSM) due to high stiffness constant C11 and C12. The model uses the frequencies of the optical and vibrational branches in the direction [100] and phonon density of states (DOS). The study of phonon spectra is important in determining the mechanical, electrical and thermodynamic properties of elements and their alloys. The present model incorporates the effect of Van der Waals interactions (VWI) and three-body interactions (TBI) into the rigid shell model (RSM) with face-centred cubic (fcc) structure, operative up to the second neighbours in short range interactions. The available measured data for platinum agrees well with our results.