Accession Number : AD0624846

Title :   TEMPERATURE DEPENDENCE OF THE INFRARED SPECTRA OF SELECTED DIELECTRICS.

Descriptive Note : Final rept. Jan 63-Jan 65,

Corporate Author : LITTLE (ARTHUR D) INC CAMBRIDGE MASS

Personal Author(s) : Jasperse,J. R. ; Marram,E. P. ; Clark,O. M.

Report Date : 20 JAN 1965

Pagination or Media Count : 52

Abstract : The infrared spectra was measured for LiF and MgO at temperatures ranging from 7.5K up to near the melting point for each crystal. The data were curve-fitted to a two-pole, damped, harmonic oscillator model and a temperature dependent expression for the dielectric constant was determined. These expressions were compared in detail to existing quantum mechanical models for the dielectric susceptibility and reasonably good agreement between theory and experiment was observed. However, some deviations at low temperatures appear between experiment and the best quantum mechanical models available. (Author)

Descriptors :   (*DIELECTRICS, INFRARED SPECTRA), (*INFRARED SPECTRA, DIELECTRICS), TEMPERATURE, LITHIUM, FLUORIDES, MAGNESIUM COMPOUNDS, OXIDES, CRYOGENICS, EXPERIMENTAL DATA, DIELECTRIC PROPERTIES, DAMPING, CRYSTALS, HARMONIC ANALYSIS

Subject Categories : Miscellaneous Materials
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE