Accession Number : AD0616684

Title :   LENGTH CHANGE MEASUREMENTS OF ELECTRON IRRADIATED CADMIUM SULFIDE IN THE ENERGY RANGE 275-935 KEV.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s) : Richard,Stephen Pierce

Report Date : JUN 1965

Pagination or Media Count : 73

Abstract : Single crystal cadmium sulfide was bombarded with 275-935 keV electrons from a Van de Graaff accelerator and the change in length was observed at room (295K) and liquid nitrogen (77K) temperatures. The crystal showed a barely detectable change in length, (-5.7=7.6) X 10 to the minus 22nd power per electron per sq cm, when bombarded with electrons below the cadmium displacement threshold at 295K. Above the cadmium threshold an initial contraction not predicted by the simple displacement theory of the order of (-6.0 X 0.001) was observed. After the initial contraction, at 550 keV the length change was (+1.0=9.8) X 10 to the minus 23rd power per electron per sq cm, while at 755 and 935 keV, the length changes were (+4.6=1.5) X 10 to the minus 22nd power per electron per sq cm and (-1.5=2.6) X 10 to the minus 22nd power per electron per sq cm, respectively. These length changes show the effect of an annealing stage which becomes dominant at large concentrations of displaced cadmium atoms. The 77K bombardments at 275 and 755 keV show contractions of (-1.8=0.6) X 10 to the minus 22nd power per electron per sq cm and (-2.9=1.3) X 10 to the minus 21st power per electron per sq cm, respectively, which are postulated as caused by the diffusion of interstitials through the lattice and the subsequent accumulation of vacancies. (Author)

Descriptors :   (*SINGLE CRYSTALS, ELECTRON IRRADIATION), (*CADMIUM COMPOUNDS, SULFIDES), (*ELECTRON IRRADIATION, SINGLE CRYSTALS), CRYSTAL DEFECTS, IMPURITIES, CRYOGENICS, TEMPERATURE, SEMICONDUCTORS, SULFUR, DEFORMATION, MEASUREMENT

Distribution Statement : APPROVED FOR PUBLIC RELEASE