Abstract
Mixtures of ZnO and SnO2 powders, with molar ratio of 2:1, were mechanically activated for 40, 80 and 160 minutes in a planetary ball mill. The resulting powders were compacted into pellets and non-isothermally sintered up to 1200?C with a heating rate of 5?C/min. X-ray diffraction analysis of obtained powders and sintered samples was performed in order to investigate changes of the phase composition. The microstructure of sintered samples was examined by scanning electron microscopy. The photoacoustic phase and amplitude spectra of sintered samples were measured as a function of the laser beam modulating frequency using a transmission detection configuration. Fitting of experimental data enabled determination of photoacoustic properties including thermal diffusivity. Based on the results obtained a correlation between thermal diffusivity and experimental conditions as well the samples microstructure characteristics was discussed. .
Highlights
Zinc stannate belongs to A2BO4 compounds (A = group II, e.g. Zn, B = group IV, e.g. Sn, Ge)
We present the results of a photoacoustic investigation of thermal and transport properties of bulk zinc stannate synthesized by reaction sintering process
− ΦS (− l,ω )- temperature variation of the sample surface that is in contact with the microphone
Summary
Zinc stannate belongs to A2BO4 compounds (A = group II, e.g. Zn, B = group IV, e.g. Sn, Ge). They are called spinels and have semiconducting properties. Their sensor properties are mostly derived from the fact that their electrical conductivity is sensitive to oxygen stoichiometry and environmental atmosphere. Zn2SnO4, investigated in this work is potentially good gas and humidity sensor. We present the results of a photoacoustic investigation of thermal and transport properties of bulk zinc stannate synthesized by reaction sintering process. -Photoacoustic set-up with an infrared laser (25 mW) as the optical source (Fig. 7)
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