This dissertation investigates the structure of stoichiometric Na 2Se/Ba Se--Ga2Se3--Ge Se2 and off-stoichiometric Ba Se--Ga2Se3--Ge Se 2 /-Se glasses using a combination of Fourier-transform Raman and solid state nuclear magnetic resonance (NMR) spectroscopies.
However, to fully utilize these properties, it is necessary to better understand the atomic-scale structure and structure-property relationships in this important class of materials.
Of particular interest in this regard are glasses in the stoichiometric system Na2Se/Ba Se--Ga 2Se3--Ge Se2 as they are isoelectronic with the well-studied, oxide glasses of the type M2O(M'O)--Al 2O3--Si O2 (M = alkali, M' = alkaline earth).
In the stoichiometric Na2Se/Ba Se--Ga 2Se3--Ge Se2 glasses, the ratio of Na 2Se/Ba Se: Ga2Se3 = 1 serves as a chemical threshold, where the network consists predominantly of corner-sharing (Ga/Ge)e4 tetrahedra, and the charge on the Na(Ba) cations is balanced by the Ga Se4- tetrahedra.
For glasses with Na 2Se/Ba Se: Ga2Se3 1, the addition of Na2Se/Ba Se results in the formation of non-bridging Se atoms, which break up the connectivity of the glassy network.
These models significantly improve our current understanding of the effects of modifier addition on the structure and properties of chalcogenide glasses, and thus enable a more efficient engineering of these highly functional materials for applications as solid electrolytes in batteries or as optical components in infrared photonics.
Thesis On Chalcogenide Glasses Solve Math Problems Fractions
In general, the underlying stoichiometric Ga2Se3--Ge Se 2 network consists primarily of corner-sharing (Ga/Ge)Se4 tetrahedra, where the coordination numbers of Ga, Ge, and Se are 4, 4, and 2, respectively.
D.)--University of California, Davis, 2016.; Publication Number: AAT 10124373; ISBN: 9781339824819; Source: Dissertation Abstracts International, Volume: 77-11(E), Section: B.; 177 p.
Chalcogenide glasses exhibit unique optical properties such as infrared transparency owing to the low-phonon energies, optical non-linearity, and photo-induced effects that have important consequences for a wide range of technological applications.
Waveguides and optical resonators are key microphotonic elements for many on-chip applications such as telecommunications and chemical sensing.
We have studied the material attenuation in Ch Gs that arises due to the presence of impurities in the raw materials and established UV photolithography-based process flows that enable fabrication of chalcogenide glass waveguides and microresonators for near- and mid-IR wavelength ranges.