Tests were performed on SrTiO$_3$, a highly ionic incipient ferroelectric insulator with a well known reflectance. The presence and temperature dependence of the lowest frequency "soft" mode were measured, as was the presence of the other two infrared modes. During the structural phase transition from cubic to tetragonal perovskite, the splitting of the second phonon mode was also observed. All of the collected data indicates good agreement with previous measurements, with a mini-discrepency between the actual and reported sample temperatures.
@mastersthesis{2004-Klassen,
author={J. Robert Klassen},
title={The design and calibration of a reflectance spectrometer using SrTiO<sub>3</sub>},
year={2004},
school={Brock University},
abstract={A new Ultra-High Vacuum (UHV) reflectance spectrometer was successfully designed, making use of a Janis Industries ST-400 sample cryostat, IR labs bolometer, and Bruker IFS 66v/S spectrometer. Two of the noteworthy features include an <i>in situ</i> gold evaporator and internal reference path, both of which allow for the experiment to progress with a completely undisturbed sample position. As tested, the system was designed to operate between 4.2K and 325K over a frequency range of 60-670 cm$^{-1}$. This frequency range can easily be extended through the addition of applicable detectors.<p>Tests were performed on SrTiO$_3$, a highly ionic incipient ferroelectric insulator with a well known reflectance. The presence and temperature dependence of the lowest frequency ``soft'' mode were measured, as was the presence of the other two infrared modes. During the structural phase transition from cubic to tetragonal perovskite, the splitting of the second phonon mode was also observed. All of the collected data indicates good agreement with previous measurements, with a mini-discrepency between the actual and reported sample temperatures.}
}