Date of Award

Spring 5-1985

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Physics

Committee Director

Desmond C. Cook

Committee Member

G. S. Khandelwal

Committee Member

G. E. Copeland

Committee Member

Gilbert R. Hoy

Abstract

An electron detector for conversion electron Mossbauer spectroscopy (CEMS) has been designed and built. Tests have been performed to study the effects on the electron detector resolution with respect to high anode voltage, He/CH4 gas flow rate, and counting rate. These parameters have been optimized to detect the 7.3 keV conversion electrons emitted following resonant absorption of the 14.4 keV source gamma-rays associated with the Mossbauer effect using 57Fe nuclei. CEMS spectra have been obtained using standard 57Fe enriched and natural iron samples. CEMS spectra and Mossbauer transmission spectra have also been obtained for iron-compensated InP (InP:Fe) samples which forms a semi-insulating material that is suitable substrate for device applications. The need for the Fe compensation is due to the fact that InP is always the n-type as grown. Thus, Fe3+ sites in the InP acts as acceptors and hence reduce the conductivity of the n-type InP to acceptable levels. Precipitates of Fe in InP are found to be FeP2 , whereas the sub-stitutional Fe in InP is found to contain high spin Fe3+ and perhaps low spin Fe2+ states.

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DOI

10.25777/mxcj-v365

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