The Measurement of Infrared Spectra of Dense Ceramics by Specular Reflectance Spectroscopy
PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB
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It is shown high quality IR specular reflectance spectra can be obtained from polished surface of dense ceramics. The reflectance spectra can be deconvoluted by the Kramers-Kronig transformation to yield absorption spectra or the real and imaginary parts of the dielectric function. IR line shapes and peak wavenumbers are comparable to single crystal data providing that the particle size is small compared with the IR wavelengths of interest. For non-cubic structures, the spectra are a superposition of polarization components. Modes separated by less than a band width are merged into a single band thus limiting the resolution of the measurement procedure. Grain size effects were modeled using the spectra of single crystal and polycrystal quartz as an example.
- Ceramics, Refractories and Glass
- Atomic and Molecular Physics and Spectroscopy