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Dielectric Screening and Phonon Dispersion in Metallic Glasses
Author(s) -
Agarwal P. C.,
Azez K. A.,
Kachhava C. M.
Publication year - 1993
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221780207
Subject(s) - phonon , ternary operation , condensed matter physics , materials science , dielectric , dispersion (optics) , electron , metal , transverse plane , thermal conduction , physics , optics , composite material , metallurgy , quantum mechanics , optoelectronics , structural engineering , engineering , computer science , programming language
Expressions for the phonon frequencies of the binary and ternary metallic glasses are derived on the basis of various dielectric screenings. A model which assumes a central force, effective between nearest neighbours, and a volume dependent force is adopted. The phonon frequencies of longitudinal and transverse phonons for the binary metallic glasses Ca 70 Mg 30 , Mg 70 Zn 30 , and Cu 57 Zr 43 and for the ternary metallic glass Pd 77.5 Si 16.5 Cu 6 are computed. The theoretical results compared with experimental data underline the importance of dielectric screening by conduction electrons.