EXPLORATORY SYNTHESIS AND CHARACTERIZATION OF NEW MIXED-FRAMEWORK CHALCOHALIDES AND OXYHALIDE AND ITS POTENTIAL APPLICATIONS FOR DILUTED MAGNETIC SEMICONDUCTOR

Author

Lei Wang, Clemson UniversityFollow

Date of Award

5-2007

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Legacy Department

Chemistry

Committee Chair/Advisor

Hwu, Shiou-Jyh

Abstract

Due to the excellent diverse properties and performance, solid-state material with low-dimensional crystal structure has always been interested by solid-state scientists. Besides the interesting properties, the low-dimensional-structured materials are used as the platform for further research and application of semiconductor and optical devices, as well as theoretic studies. My dissertation research mainly focuses on two aspects: discovery of solids with low-dimensional crystal structure; fabrication and investigation of new materials using the discovered materials as the platform.
The idea of mixed-anion-framework has been used in synthesis of novel low-dimensional-structured solid-state materials. The stereo-active Sb³⁺/Bi³⁺ chalcogenides building units and their halogen-containing derivatives have been applied for the new structure search and design. Four chalcohalides families with novel structures: CdMQ₂X; CdSb₂Se₃Br₂; InM₂Q₄X (M = Sb, Bi; Q = S, Se; X = Cl, Br and I); In₂Bi₃Se₇I and one new discovered oxyhalide LiSb₂O₃Cl have been designed, synthesized and characterized. Two DMS systems -- Mn-doped CdBiS₂Cl and CdBiSe₂I with confined crystal structures have been fabricated and characterized; the ferromagnetism has been firstly observed in the discussed chemical system. Also, the correlation between magnetism and structure has been investigated and rationalized.
In this thesis, the exploratory synthetic work (conceptual structure design and crystal growth), the characterization of properties (X-ray crystal structure analysis, optical, and magnetic studies) and the theoretic calculation (band structure and bond valance analysis) will be discussed in details.

Recommended Citation

Wang, Lei, "EXPLORATORY SYNTHESIS AND CHARACTERIZATION OF NEW MIXED-FRAMEWORK CHALCOHALIDES AND OXYHALIDE AND ITS POTENTIAL APPLICATIONS FOR DILUTED MAGNETIC SEMICONDUCTOR" (2007). All Dissertations. 82.
https://open.clemson.edu/all_dissertations/82