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Psuedo-Oxides: Property Tailoring Through the Integration of Nitrogen and Fluorine

Seibel, Harry Andrew, II
http://rave.ohiolink.edu/etdc/view?acc_num=osu1250624527

Abstract Details

2009, Doctor of Philosophy, Ohio State University, Chemistry.
This research focuses on the study of inorganic solids in which the anions of oxygen, fluorine and nitrogen have been incorporated. These compounds have been studied for their properties and characterized both structurally and optically. Through the use of diffraction techniques, elemental analysis, and UV-Vis diffuse reflectance the structures and stoichiometric formulae of these mixed anionic solids (pseudo-oxides) have been characterized. In chapter 2 two nitrogen and fluorine codoped TiO2 anatase compounds are synthesized. One compound with a formula of TiN0.05O1.89F0.06 is green in color, while the other compound with a formula of TiN0.04O1.92F0.04 is yellow in color. Given the vibrant colors of the doped TiO2, which is a well known UV light photocatalyst, the electronic structure of the yellow compound was investigated. Through optical and electrochemical means the band placement was found on the energy scale with a conduction band edge of -0.05 V at pH of 4.8 and a band gap of 2.4 eV. In chapter 3 several RETiNbO6 oxides are investigated as precursors to RbRETiNbO6F oxyfluorides. The RbNdTiNbO6F compound, of interest in this chapter, is a Dion Jacobson two layered perovskite. Although it was previously reported by Carunta et al. 2002 the optical band gap had not been discussed; in this study it was determined from UV-Vis diffuse reflectance to be 3.5 eV. Following the formation of RbNdTiNbO6F an ammonolysis of this compound in the presence of RbCO3 was performed under the hypothesis that nitridation of the phase would occur. This hypothesis was based upon precedence where it was demonstrated that the Dion Jacobson n=2 layered perovskite RbLaNb2O7 was converted to Rb1.8LaNb2O6.3N0.7 • H2O via the same method (Schottenfeld et al., 2005). However, oxygen replacement of fluorine occurred preferentially to the nitridation of the phase and the compound Rb2NdTiNbO7 • H2O was formed. In chapter 4 two LiNbO3 related systems are investigated. These new Na1.5Ag1.5(Mo/W)O3F3 compounds were investigated for there potential as polar compounds. Through the incorporation of the polar (Mo/W)O3F33- subunit, it was hypothesized that a polar compound would result. This was not the case, however through the use of hard and soft cations a layered structure consisting of oxide layers coordinated to silver atoms and fluorine layers coordinated to sodium atoms was formed. This may offer insight which would be useful for the creation of new polar solids.
Patrick Woodward, PhD (Advisor)
Sheldon Shore (Other)
Yiying Wu (Other)
124 p.
Chemistry; Materials Science
Mixed anions; Nitrides; Fluorides; Photocatalysis; NLO; Polar solids

Recommended Citations

Citations

  • Seibel, II, H. A. (2009). Psuedo-Oxides: Property Tailoring Through the Integration of Nitrogen and Fluorine [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250624527

    APA Style (7th edition)

  • Seibel, II, Harry. Psuedo-Oxides: Property Tailoring Through the Integration of Nitrogen and Fluorine. 2009. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1250624527.

    MLA Style (8th edition)

  • Seibel, II, Harry. "Psuedo-Oxides: Property Tailoring Through the Integration of Nitrogen and Fluorine." Doctoral dissertation, Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250624527

    Chicago Manual of Style (17th edition)

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This open access ETD is published by The Ohio State University and OhioLINK.