VALENCE LOSS SPECTRA FROM SIO2 POLYMORPHS OF DIFFERENT DENSITY

Authors
MCCOMB DW HOWIE A
Citation
Dw. Mccomb et A. Howie, VALENCE LOSS SPECTRA FROM SIO2 POLYMORPHS OF DIFFERENT DENSITY, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 96(3-4), 1995, pp. 569-574
Citations number
19
Categorie Soggetti
Physics, Nuclear","Nuclear Sciences & Tecnology","Instument & Instrumentation
Journal title
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms → ACNP
ISSN journal
0168583X
Volume
96
Issue
3-4
Year of publication
1995
Pages
569 - 574
Database
ISI
SICI code
0168-583X(1995)96:3-4<569:VLSFSP>2.0.ZU;2-K
Abstract
Dielectric response functions for stishovite, coesite, cu-quartz and s ilacalite, obtained from electron energy loss spectra are studied and compared. The data for stishovite conforms well to simple dielectric t heory for an insulator. However the behaviour of the other materials, including the relative insensitivity of the plasmon peak to density, i s less well explained either on this basis or using more elaborate mod els based on Maxwell Garnett or Clausius-Mossotti effective medium the ory. Possible improvements to effective medium theory are discussed.