• Research Support
      • Starting Library Research
      • Research Guides
      • Subject Librarians
      • Digital Scholarship Center
      • Publishing & Copyright
      • Research Data Management
      • Study Skills & Campus Resources
      • Request a Purchase
    • Using the Libraries
      • Rooms & Study Spaces
      • Borrowing & Requesting
      • Connect from Off-campus
      • ILL (Interlibrary Loan)
      • Course Reserves
      • Technology, Printing, & Scanning
      • Tutoring at the UO Libraries
      • Classroom Technology Support
      • Canvas Support
      • Accessibility
    • Collections
      • Databases A-Z
      • Scholars' Bank
      • Videos, Music, Photos
      • Special Collections & University Archives
      • Unique Collections
      • Government Documents
      • Maps & Aerial Photography
      • Oregon Digital
      • Oregon Newspapers
    • Library Accounts
      • LibrarySearch Account
      • ILLiad Account (Interlibrary Loan)
      • Endnote Web (Citation Manager)
    • About
      • Hours & Locations
      • Staff & Department Directory
      • News & Events
      • Calendar
      • Mission, Values, & Strategic Directions
      • Diversity & Inclusion
      • Policies
      • Jobs
      • Comments & Suggestions
    • Chat/Ask Us
      • Email
      • Phone
      • Text
    View Item 
    •   Scholars' Bank Home
    • University Archives
    • University of Oregon Administration
    • The Office of Research, Innovation and Graduate Education
    • Theses and Dissertations
    • View Item
    •   Scholars' Bank Home
    • University Archives
    • University of Oregon Administration
    • The Office of Research, Innovation and Graduate Education
    • Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Novel Misfit Layer Systems: Synthesis and Characterization

    View/Open
    Anderson_Michael D_phd2011su.pdf (12.96Mb)

    Date
    2011-09
    Author
    Anderson, Michael D., 1980-
    Metadata
    Show full item record
    Author
    Anderson, Michael D., 1980-
    Abstract
    Stabilizing mechanisms and design considerations for generating misfit layer compounds with a variety of different structural motifs were explored using designed precursors consisting of elemental layers. Layer order in the precursor film and the behavior of binary reaction couples was used to avoid undesirable reaction intermediates. Electron diffraction patterns of CuCr2 Se4 were inconsistent with prior reports that this compound has the spinel structure and were more consistent with a hexagonal R 3 ̄ structure. STEM imaging also suggests CuCr2 Se4 prepared using the compositionally modulated kinetic trapping approach is a new polymorph of the spinel structure. Electrical and magnetic properties were consistent with prior literature reports. Magnetic susceptibility measurements show pronounced hard and easy axes of magnetization not previously documented, which are consistent with a hexagonal crystal symmetry. The [{(PbSe)m }0.99 (WSe2 )n ] r and [{(PbSe)m }1.00 (MoSe2 )n ] r systems were investigated by STEM, XRD and density functional theory (DFT) modeling. No crystallographic registration between MSe and TSe 2 layers was observed and the diffraction observed in the hk 0 and hkl directions, where h = k = 0, can be described by diffraction from discrete layers of finite thickness. A distortion of the MX structure for m > 4 was documented. The distortion in MSe layers was largest for m = 2 and independent of TSe2 thickness. A novel family of compounds, [{(FeSe)m }1+y (NbSe 2 )n ]r , were synthesized inspired by a geological precedent. Single FeSe and NbSe2 layer thicknesses ((0.571 ± 0.005) nm and (0.653 ± 0.002) nm respectively) are consistent with literature values for the binary compounds. STEM-HAADF images of the [{(FeSe) 5 }1+y (NbSe2 )5 ]r revealed a multilayer structure with two distinct structural subunits. STEM-EELS analysis of the film showed no intermixing between the Nb and Fe regions within the limit of the measurement. Another family of misfit layer compounds, [{(NbSe2 )m }1+y (CuCr2Se4)n]r, designed to test requirements for a stable misfit layer compound, were successfully synthesized. STEM analysis of the [{(NbSe2 )5 }1+y (CuCr2 Se4 ) 1 ]r compound showed a well segregated film with two distinct subunit structures. Thicknesses for individual layers of NbSe2 or CuCr2 Se4 ((0.648 ± 0.004) nm and (1.76 ± 0.01) nm respectively) are consistent with prior literature reports of the individual binary compounds. This dissertation includes previously published and unpublished co-authored material.
    URI


    Collections
    • Chemistry Theses and Dissertations [167]
    • Theses and Dissertations [2826]

    My Account

    LoginRegister

    Browse

    All of Scholars' BankCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    Statistics

    View Usage Statistics

    CAMPUS

    • News
    • Events
    • Maps
    • Directions
    • Class Schedule
    • Academic Calendar

    RESOURCES

    • Webmail
    • Canvas
    • Duckweb
    • Find People
    • A–Z Index
    • UO Libraries

    RELATED INFORMATION

    • Library Accessibility
    • Privacy Policy
    • Giving
    UO Libraries
    1501 Kincaid Street
    1239 University of Oregon
    Eugene, OR 97403-1299

    T: 541-346-3053

    FacebookTwitterYouTubeInstagram

    CareersPrivacy PolicyAboutFind People
    University of Oregon
    ©University of Oregon. All Rights Reserved.

    UO prohibits discrimination on the basis of race, color, sex, national or ethnic origin, age, religion, marital status, disability, veteran status, sexual orientation, gender identity, and gender expression in all programs, activities and employment practices as required by Title IX, other applicable laws, and policies. Retaliation is prohibited by UO policy. Questions may be referred to the Title IX Coordinator, Office of Affirmative Action and Equal Opportunity, or to the Office for Civil Rights. Contact information, related policies, and complaint procedures are listed on the statement of non-discrimination.