Thermionic work function of LaB/sub 6/ single crystals and their surfaces

Journal Article · Thu Sep 01 00:00:00 EDT 1977 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.324266· OSTI ID:7305817

Oshima, C; Bannai, E; Tanaka, T; Kawai, S

The thermionic work functions and the Richardson constants for LaB/sub 6/ single crystals have been measured using a diode system with a guard ring under stable thermionic conditions. They are 2.86 +- 0.03 eV, 82 A/cm/sup 2/ K/sup 2/ for the (100) plane, 2.68 +- 0.03 eV, 57 A/cm/sup 2/ K/sup 2/ for the (110) plane, and 3.4 +- 0.2 eV, 71 A/cm/sup 2/ K/sup 2/ for the (111) plane. The (111) faceting on the (110) plane has an important effect on the reduction of the thermionic current from the (110) plane at 5 x 10/sup -6/ Torr.

• Research Organization: National Institute for Researches in Inorganic Materials, Kurakake, Sakura-Mura, Nihari-Gun, Ibaraki 300-31, Japan
• OSTI ID: 7305817
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 48:9; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
AUGER ELECTRON SPECTROSCOPY
BORIDES
BORON COMPOUNDS
BRIGHTNESS
CATHODES
COHERENT SCATTERING
CRYOGENIC FLUIDS
CRYSTALS
DIFFRACTION
ELECTRODES
ELECTRON DIFFRACTION
ELECTRON SOURCES
ELECTRON SPECTROSCOPY
ELEMENTS
EMISSION
EQUATIONS
FLUIDS
HIGH VACUUM
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
MONOCRYSTALS
NONMETALS
OPTICAL PROPERTIES
OXYGEN
PARTICLE SOURCES
PHYSICAL PROPERTIES
RADIATION SOURCES
RARE EARTH COMPOUNDS
RICHARDSON EQUATION
SCATTERING
SPECTROSCOPY
SURFACE PROPERTIES
THERMIONIC EMISSION
THERMIONIC EMITTERS
WORK FUNCTIONS