Abstract
The lattice-dynamical properties of NaBr, NaI, RbCl, RbBr and RbI have been investigated by utilizing a 7-parameter bond-bending force model (BBFM) recently proposed for NaCl structure. The model basically incorporates i) noncentral nearest-neighbour and central next-nearest-neighbour interactions, ii) bond-bending forces due to the deformations in the interbond angles and iii) long-range Coulombic interactions. The seven disposable parameters employed in the present treatment were determined by making use of the experimental values of three elastic constants, four critical-point phonon frequencies and the lattice equilibrium condition. The model thus has been used to study the phonon dispersion relations, phonon density of states and temperature variation of the Debye characteristic temperatures of the afore-said compounds. Theoretical results have been compared with the available experimental data and reveal good agreement.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
