Defense Date

9-10-2009

Graduation Date

Fall 2009

Availability

Immediate Access

Submission Type

dissertation

Degree Name

PhD

Department

Chemistry and Biochemistry

Committee Chair

Jennifer Aitken

Committee Member

Jeffry Madura

Committee Member

Howard Kingston

Committee Member

Charles Taylor

Keywords

Diamond Like Semiconductors, Intermetallic, Microwave, Second Harmonic Generation, Synthesis

Abstract

Diamond-like semiconductors are interesting materials to study due to the wide variety of technologically useful properties that these materials possess. These normal valence compounds have structures that are based on that of diamond, either the cubic or hexagonal polymorph. Though there are a finite number of possible compounds, due to isovalent and isoelectronic principles, the total number of potential compounds is quite extensive. Quaternary diamond-like semiconductors provide a unique opportunity, because much of the previous research has focused on binary and ternary systems leaving quaternary systems, relatively unexplored. Additionally, quaternary diamond-like semiconductors possess a greater degree of compositional flexibility compared to binary and ternary materials, which could result in the ability to more carefully tune desired physical properties.

In order to prepare the new materials, Li2ZnGeS4, Li2ZnSnS4, Li2CdGeS4, Li2CdSnS4 and Ag2MnSnS4, several synthetic methods have been employed, including high-temperature solid-state synthesis, polychalcogenide flux synthesis and solid-state microwave synthesis. The solid-state microwave synthetic method was itself studied using a number of target systems such as the ternary diamond-like semiconductor, AgInSe2. Additionally, several intermetallic compounds, such as Ag3In, AuIn2 and Bi2Pd were prepared using this procedure. Solid-state microwave synthesis is not as well known as some of the other synthetic methods that were employed in this work possibly due to a lack of understanding of the method, training and equipment. Despite these problems, the method has the potential to save time, energy and cost due to the unique nature of microwave heating. In an attempt to gain a better understanding of this synthetic method and its capabilities, the solid-state microwave synthetic method was used to prepare diamond-like semiconductors and intermetallic compounds.

Format

PDF

Language

English

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