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Dipole effects and the work functions of the single crystal LaB6

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Volume
122
Issue
2
Identifiers
DOI: 10.1016/0039-6028(82)90085-1

Abstract

Abstract Both the interior dipole structure normal to the polar surface of a crystal and any dipole layer at the surface itself contribute to the surface work function. For LaB 6, the structures of the unreconstructed (100), (110) and (111) faces or the reconstructions believed to characterize the (110) and (111) surfaces would produce dipole layers and differences in work function among these surfaces which are at least an order of magnitude greater than the differences which have been measured. Modification in ionic charge at sites making up the outermost surface dipole layers can markedly affect the dipole contribution to the work functions and it is argued that such charge modification may occur as a general phenomenon in ionic crystals.

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