  In this work the electron paramagnetic resonance (EPR) spectra of Al2O3 and
ZrO2 powders were measured for different size of grains (0.074, 0.044 mm) as
well as the mullites (0.07 and 0.12 mm). Also were investigated the ceramic
cores. The measurements were performed at room temperature and in the
temperature range from 140 up to 380 K. The main purpose of this work was to
investigate the possible relationships between the EPR spectra and the size of
powder grains as well as the identification of EPR spectra in view of the
potential application of EPR technique as a fingerprinting method.
