학술논문
PHOTOELECTRIC PROPERTIES OF NATURAL URANIUM AND CHANGES OCCURRING AT CRYSTALLOGRAPHIC TRANSFORMATIONS
Document Type
Journal Article
Author
Source
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D; Vol: 125; Other Information: Orig. Receipt Date: 31-DEC-62
Subject
Language
English
ISSN
0031-899X
Abstract
Studies of the photoelectric properties of high-purity, carefully outgassed natural uranium were made through a wide temperature range, including 938 and 1043 deg K at which crystallographic transformations occur. Changes in the slope of the temperature-photoelectric current curves for monochromatic radiations are presented. Analysis of the data at different temperatures indicates changes in both the surface work function and the combined number density of free electrons and transition probability factor at the allotropic transformation temperatures. The work function of clean'' uranium was found to be 3.47, 3.52, and 3.39 ev, respectively, for orthorhombic below 938 deg K), tetragonal (938 to 1043 deg K) and body-centered cubic (above 1043 deg K) uranium. (auth)