Date of Award

Summer 1984

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Physics

First Advisor

Karioris, Frank G.

Second Advisor

Ehlert, Thomas

Third Advisor

Kiuck, Lee

Abstract

Nonolayers of three micron diamond powder were exposed to various fluences of the heavy ions Ne+, Ar+, Kr+, and Xe+ with kinetic energy 3 MeV. X-ray diffraction patterns were taken before and after irradiation for each sample. For a few samples it was possible to obtain scanning electron micrographs of a field of particles both before and after irradiation to moderate doses. The one observable x-ray diffraction peak shifts toward lower angles and broadens with increasing fluence indicating an increase in lattice constant. The effect is more pronounced with heavier ions and appears to saturate at a value of da/a consistent approximately with the breaking strain limit of diamond. Some evidence of undamaged diamond remains. For the Ne+ and Ar+ exposures, the integrated intensity of scattered x-rays remains approximately constant with increasing fluence in sharp contrast to the results with zircon. In the scanning electron micrographs, irradiated particles increase in size as is reported for neutron irradiations of diamond.

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