| Autor: |
Nikolic, P. M., Nikolic, M. V., Lukovic, D., Savic, S., Ristic, M. M. |
| Zdroj: |
International Journal of Materials Research: Zeitschrift fuer Metallkunde; December 2021, Vol. 95 Issue: 3 p147-150, 4p |
| Abstrakt: |
The thermal diffusivity of NiO pellets was determined by the photoacoustic technique. A NiO powder, with a purity of 99.95 %, was pressed into pellets 10 mm in diameter. The average agglomerate size of the NiO powder was 50 μm and the size of individual particles was between 1 and 10 μm. The pressing pressure was 1.5 GPa and the sintering temperature was 1100 °C. The sintering time was between 15 and 240 min. The photoacoustic phase and amplitude spectra of NiO were measured as a function of the modulating frequency, using a transmission detection configuration. Thermal diffusivity, DT, the coefficient of minority carrier diffusion, their mobility and life time, and front and rear recombinating velocities were calculated as a function of sintering time by comparing the experimental results with theoretical photoacoustic phase and amplitude signals. The thermal diffusivity increases from 0.67 · 10−5to 0.97 · 10−5m2/s when the sintering time was changed from 15 to 240 minutes. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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