Date of Award

Summer 1971

Document Type

Dissertation - Restricted

Degree Name

Doctor of Philosophy (PhD)


Mechanical Engineering

First Advisor

Cartz, L.

Second Advisor

Hirthe, William

Third Advisor

Stajdohan, Ralph E.


Materials which exhibit any abnormal behavior regarding temperature or pressure dependence are of great interest because of the possibility that unexpected properties may develop. Hexagonal selenium possesses an anomalous thermal expansion, and is therefore an interesting candidate for a high pressure diffraction investigation. Large discrepancies exist in the literature regarding its compressibility, and a high pressure structure investigation has not been reported. This investigation is concerned with determining the zero pressure compressibilities of hexagonal selenium, explaining the anomalous axial behavior under pressure, and high pressure phase transformation:,.



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