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SiO 2 in 6:3 (stishovite) and 4:2 Co‐ordination—Characterization by core level spectroscopy (XPS/XAES)
Author(s) -
Finster J.
Publication year - 1988
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740120507
Subject(s) - stishovite , x ray photoelectron spectroscopy , relaxation (psychology) , context (archaeology) , chemistry , analytical chemistry (journal) , quartz , binding energy , crystallography , atomic physics , materials science , nuclear magnetic resonance , physics , metallurgy , social psychology , paleontology , chromatography , biology , psychology
Abstract A comprehensive XPS/XAES investigation of the dense 6:3 co‐ordinated SiO 2 polymorph stishovite in comparison with different SiO 4/2 samples and Si was carried out for the first time. By evaluation of initial state and final state shift contributions, effective charges and extra‐atomic relaxation energies were determined and discussed in the context of the electronic structure for different co‐ordination numbers. The reduced binding energies of Si and O lines for stishovite are due to the higher extra‐atomic relaxation energy in comparison to SiO 4/2 , which correlates with the higher dielectric constant and the lower gap energy in SiO 6/3 . The effective charges are only slightly higher in stishovite than e.g. in quartz.