ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The scattering factor for electrons is sensitive to differences in atomic bonding at low values of sin θ/λ. These differences will influence the amplitudes and phases of low-order beams of electrons diffracted from crystals with large unit cells. The experimental intensities of these beams, and contrast in the corresponding lattice images, can be used to derive upper limits for the charges on constituent ions, provided the associated n-beam dynamical calculations are carried out with sufficient precision. It is shown that, in W4Nb26O77, the atoms can be only partially ionized, and the bonding must have some covalent character.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739473000379
