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Synthesis and Crystal Chemistry of Bimetallic Group II Nitride Fluorides

OMWENGA, JERSFREY OMWENGA
http://orcid.org/0000-0003-2590-2847
http://rave.ohiolink.edu/etdc/view?acc_num=ysu1534861452050001

Abstract Details

2018, Master of Science in Chemistry, Youngstown State University, Department of Chemistry.
This thesis project focused on the synthesis and crystal chemical characterization of single crystalline bimetallic nitride fluorides of general composition BaMNF, with M = Mg, Sr, & Ca. Single crystalline samples were grown through slow cooling of metal and metal fluoride mixtures reacted under nitrogen gas at high temperature. High resolution X-ray diffraction data was collected and used to elucidate the crystal chemistries of the new phases, which are described in detail. Compositional analysis using energy dispersive spectroscopy combined with the FIB (Focused Ion Beam) milling technique in a scanning electron microscope was performed on two phases, possibly indicating small amounts of oxygen contamination in these compounds. Four new Group II bimetallic nitride fluoride phases were prepared and characterized via single crystal X-ray diffraction in this study. A Sr-rich BaSrNF ordered rocksalt-type phase was prepared showing some disorder and a non-stoichiometric defect. BaSrNF (Sr-rich) and BaCaNF (Ba-rich) disordered rocksalt-type compounds were prepared. A Ba-rich BaCaNF rhombohedral phase was also prepared and characterized, and crystal chemical factors governing the choice of rhombohedral vs. the ordered rocksalt-type cubic structure are discussed. Attempts to prepare BaMgNF compounds were unsuccessful. Finally, previous studies were revisited on Sr2NF to further elucidate the crystal chemistry of this phase as a baseline for BaSrNF studies. No Group II bimetallic inorganic nitride fluoride compounds have been previously reported in the literature. Such bimetallic compounds could offer the ability to tune band-gaps and thus optical and electronic properties relative to single metal M2NF compounds.
Timothy Wagner, PhD (Advisor)
Sherri Cameron, PhD (Committee Member)
Christopher Arntsen, PhD (Committee Member)
79 p.
Chemistry; Inorganic Chemistry; Materials Science
Crystal Chemistry, Synthesis, Bimetallic Group 2 Nitride Fluorides and Characterization

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Citations

  • OMWENGA, J. O. (2018). Synthesis and Crystal Chemistry of Bimetallic Group II Nitride Fluorides [Master's thesis, Youngstown State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1534861452050001

    APA Style (7th edition)

  • OMWENGA, JERSFREY. Synthesis and Crystal Chemistry of Bimetallic Group II Nitride Fluorides. 2018. Youngstown State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ysu1534861452050001.

    MLA Style (8th edition)

  • OMWENGA, JERSFREY. "Synthesis and Crystal Chemistry of Bimetallic Group II Nitride Fluorides." Master's thesis, Youngstown State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1534861452050001

    Chicago Manual of Style (17th edition)

ysu1534861452050001
251
© 2018, all rights reserved.
This open access ETD is published by Youngstown State University and OhioLINK.