Date of Award


Document Type

Dissertation - Restricted

Degree Name

Doctor of Philosophy (PhD)


Mechanical Engineering

First Advisor

Robert F. Brebrick

Second Advisor

Robert N. Blumenthal

Third Advisor

Walter M. Hirthe

Fourth Advisor

Martin A. Seitz

Fifth Advisor

Peter H. Wackman


One problem in the fabrication of electronic devices from multi-constituent, semiconducting compounds is the possible presence of multiple phases. Another problem that occurs, even when a simple phase is obtained is the control of the electrical characteristics of the resulting material. It has been observed that compositional changes too small to be accomplished through weighing can· alter the electrical characteristics of a single phase material. This results from the compositional effect on the concentration of nonstoichiometric defects which can strongly influence the electrical characteristics. The control of these defect concentrations can be accomplished thermodynamically by constraining the temperature and equilibrium partial pressures ·of the constituent vapor species over the material during a post-growth anneal.

One material that requires this careful control of the defect concentration is the mercury-cadmium-tellurium alloy in the solid solution region along the HgTe-CdTe pseudobinary plane. The usefulness of this material as an infrared detector has been well established and a desire to prepare and control this material over a broader range of compositions exists. To date the available thermodynamic data for the mercury-cadmium-tellurium system is incomplete. This investigation sought to establish some of· the data for a particular composition (x = .416, y = .5) in the (Hg1-xCdx)yTe1-y alloy.



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