Investigation of sintering kinetics of NiO using photoacoustic spectroscopy

Abstract

Sintering kinetics of NiO was investigated using photoacoustic spectroscopy. This method was used to follow the change of phase and amplitude of the photoacoustic signal of nickel-oxide samples sintered at 1373 K for 15-240 min. as a function of modulation frequency of the laser beam. Fitting of experimental data enabled determination of photoacoustic properties including thermal diffusivity of sintered nickel-oxide. Analysis of the change of sample density during sintering showed that the sintering process of this material can be observed from the viewpoint of activated volume and the change of thermal diffusivity can be correlated with the change of density of this material.