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Title: Magnetism and Geometric Magnetic Frustration in YbFe2O4-Type and Garnet-Type Compounds
Authors: Cevallos, Francois Alexandre
Advisors: Cava, Robert J
Contributors: Chemistry Department
Keywords: Geometric magnetic frustration
Subjects: Chemistry
Materials Science
Issue Date: 2018
Publisher: Princeton, NJ : Princeton University
Abstract: Geometric magnetic frustration arises when the crystal structure of a compound inherently hinders long-range magnetic ordering. As numerous important and unusual magnetic properties are most easily observed in geometrically frustrated materials, it is an important topic in solid state chemistry. Frustration often results from a combination of antiferromagnetic interactions and a triangular lattice structure. This thesis will discuss geometric magnetic frustration and other magnetic properties in two structure families which possess a prominent triangular motif. Chapter 1 serves as an introduction to solid state chemistry as a whole, as well as introducing magnetic concepts that will be referenced for the remainder of the work. The main body of the thesis is divided into two parts of four chapters each. Part I focuses on compounds with the YbFe2O4 structure, while Part II describes the magnetic properties of several garnet-type materials. Part I begins with an introduction to the structure and properties of compounds with the YbFe2O4 structure in Chapter 2, followed by a methodological chapter describing several methods of crystal growth, including the complex Floating Zone growth method employed in Chapters 4 and 5. These two chapters discuss the synthesis and magnetic characterization of the compounds TmMgGaO4 and ErMgGaO4, respectively. Chapter 6, the first chapter of Part II, serves as an introduction to the garnet crystal structure, which occurs in many naturally-occurring minerals. Chapter 7 discusses the subject of high-pressure synthesis, which is the method used to synthesize the compounds studied in Chapter 8. Chapter 8 itself is a magnetic study of the garnet Mn3Fe2Si3O12, as well a comparison to a glassy material of the same nominal composition. Finally, Chapter 9 is an in-depth magnetic study of a family of lithium-containing rare earth garnets of the form Li3RE3Te2O12.
Alternate format: The Mudd Manuscript Library retains one bound copy of each dissertation. Search for these copies in the library's main catalog:
Type of Material: Academic dissertations (Ph.D.)
Language: en
Appears in Collections:Chemistry

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