Dissertation/Thesis Abstract

Magnetism in Ruthenium-Based Oxides with Face-Centered Cubic Substructure
by Donato, Marie, M.S., California State University, Long Beach, 2020, 75; 28028954
Abstract (Summary)

In an effort to understand the structure-property relationship in magnetically frustrated systems, ruthenium-based (S= 3/2) oxides Li3Mg2RuO6 and Ca2ScRuO6 were investigated. The orthorhombic analog of Li3Mg2RuO6 has been successfully synthesized in an ordered rock salt structure type. This study focuses on the synthesis, characterization and physical property measurements of the monoclinic Li3Mg2RuO6 and compares the resultant magnetism with the orthorhombic structure. This work also focuses on the synthesis, characterization and physical property measurements of the novel B-site ordered double perovskite Ca2ScRuO6. This 4d3 system is compared to the isoelectronic and isostructural Os-based compound

in order to understand the impact of principle quantum number on these magnetic interactions. Crystal structure was determined by powder x-ray diffraction and Rietveld refinement. Physical properties were investigated through temperature dependent DC and AC magnetic susceptibility, electrical conductivity, Seebeck coefficient, and heat capacity data measurements. To better understand the magnetic exchange interactions in monoclinic Li3Mg2RuO6 and Ca2ScRuO6, spin dimer analysis was performed.

Indexing (document details)
Advisor: Derakhshan, Shahab
Commitee: Bu, Xianhui, Li, Lijuan
School: California State University, Long Beach
Department: Chemistry and Biochemistry
School Location: United States -- California
Source: MAI 82/6(E), Masters Abstracts International
Subjects: Chemistry, Electrical engineering, Quantum physics, Materials science, Electromagnetics
Keywords: Magnetism, Ruthenium-based oxides, Face-centered cubic substructure
Publication Number: 28028954
ISBN: 9798698594741
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