Low temperature measurements by infrared spectroscopy in $CoFe_2O_4$ ceramic

This paper presents results of new far-infrared and middle-infrared measurements (wavenumber range of 4000 - 100 cm$^{-1}$) of the $CoFe_{2}O_{4}$ ceramic in the temperature range from 300 K to 8 K. The band positions and their shapes remain constant across the wide temperature range. The quality of the sample was investigated by X-ray, EDS and EPMA studies. The $CoFe_{2}O_{4}$ retains the cubic structure (Fd-3m) across the temperature range from 85 K to 360 K without any traces of distortion. Based on current knowledge the polycrystalline $CoFe_{2}O_{4}$ does not exhibit any phase transitions across the temperature range from 8 K to 300 K.