| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Solid-state Optical Materials and Luminescence Properties
|
| Presentation Title |
Optical Basicity of Oxynitrides |
| Author(s) |
Doris Möncke, Sharafat Ali, Bo Jonson, Efstratios I. Kamitsos |
| On-Site Speaker (Planned) |
Doris Möncke |
| Abstract Scope |
We apply the concept of optical basicity to oxynitride systems by comparison of nitride systems, either crystalline or glassy, with respective oxides. The optical basicity, Λ, was calculated from the chemical composition or by explotimg the relationship between Λ and anion polarizability. Experimental refractive index and density data of alkaline earth and rare earth silicate oxynitride glasses, as well as literature data of similar systems let us propose a method to separate nitride polarizabilities (αN) from oxide polarizabilities (αO) in mixed M-Si-O-N systems with varying N:O and M:Si ratios.We find good agreement with Duffy’s previous work on oxyfluoride glasses as the optical basicity varies for the isoelectronic anions N3-:O2-:F- as follows: Λ(fluoride)=1⁄2Λ(oxide)=1⁄3Λ(nitride). The optical basicity of complex nitrides can therefore be calculated by the same method established for oxides using the equivalent fractions and basicity of the constituent nitrides. |