Accession Number:

ADA210609

Title:

The Measurement of Infrared Spectra of Dense Ceramics by Specular Reflectance Spectroscopy

Descriptive Note:

Technical rept.

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB

Personal Author(s):

• Bliss, Mary
• Walden, Barbara L.
• White, William

Report Date:

1989-07-17

Pagination or Media Count:

29.0

Abstract:

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.

Descriptors:

• *CERAMIC MATERIALS
• *INFRARED SPECTRA
• POLARIZATION
• MEASUREMENT
• SPECTROSCOPY
• SHAPE
• SINGLE CRYSTALS
• GRAIN SIZE
• SURFACES
• SPECULAR REFLECTION
• DIELECTRIC PROPERTIES
• SPECTRA
• HIGH DENSITY
• YIELD
• COMPLEX NUMBERS
• REFLECTANCE
• ABSORPTION SPECTRA
• BANDWIDTH
• PARTICLE SIZE
• CRYSTAL STRUCTURE

Subject Categories:

• Ceramics, Refractories and Glass
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE