INFRARED LATTICE VIBRATIONS OF MAGNESIUM STANNIDE.
Physical sciences research papers,
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
Pagination or Media Count:
The room-temperature infrared reflection spectrum of semiconducting Mg2Sn with carrier concentration of 3 X 10 to the 17th power 1cc has been measured between the wavelengths of 5 and 100 microns. By classical oscillator theory, the reflectivity of the fundamental lattice vibration region has been analyzed, and the following obtained frequencies, strengths, and linewidths of the infrared active modes high and low frequency dielectric constant values and the refractive index n and extinction coefficient k as a function of wavelength. In order to fit the experimental results, it is necessary to assume two sets of dispersion parameters with the strong transverse optical TO resonance at 53.75 microns 186 1cm and a weak one at 48.25 microns 207 1cm. Author