Published May 1979 | Version v1
Journal article Metadata-only

Study of surface stoichiometry and thermionic emission using LaB6

Creators

  • 1. Los Alamos Scientific Laboratory, University of California, Los Alamos, New Mexico 87545

Description

The variables which influence the surface composition of vaporizing compounds have been studied using the behavior of LaB6 as an example. The thermionic work function of LaB6 has been determined as a function of surface stoichiometry. A nearly constant value of 2.93 eV for the effective work function was observed from the LaB6+LaB4 boundary up to approximately LaBatsub 6.06at. A further increase in boron content caused a steep increase reaching 3.40 eV at the LaB6+LaB9 boundary at 1500 K. The interior composition which produces a surface composition having a high emission flux and the lowest attrition rate is in the high boron region near LaBatsub 6.5at, not at the stoichiometric composition

Additional details

Publishing Information

Journal Title
J. Appl. Phys.
Journal Volume
50
Journal Issue
5
Series
J. Appl. Phys.
Journal Page Range
3691-3698
ISSN
0021-8979

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
10486972
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
CHEMICAL COMPOSITION; LANTHANUM BORIDES; QUANTITY RATIO; SURFACES; THERMIONIC EMISSION; VARIATIONS; VERY HIGH TEMPERATURE; WORK FUNCTIONS
Descriptors DEC
BORIDES; BORON COMPOUNDS; EMISSION; LANTHANUM COMPOUNDS; RARE EARTH COMPOUNDS