Thermal diffusivity and conductivity measurement of undoped La2O3 powder by homemade photoacoustic spectrometer.
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| Title: | Thermal diffusivity and conductivity measurement of undoped La |
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| Authors: | Sarkar, Minarul I.1 (AUTHOR) minarul.ism@gmail.com, Kumar, Kaushal1 (AUTHOR) |
| Source: | Journal of Materials Science: Materials in Electronics. Sep2023, Vol. 34 Issue 25, p1-11. 11p. |
| Abstract: | Photoacoustic spectroscopy is a unique experimental technique for material characterization in any phase such as solid, liquid, gas, or condensed medium. The thermal properties like thermal diffusivity or thermal conductivity have been measured by recorded photoacoustic signals varying chopping frequency under 980 nm diode laser sources. In this work, the authors have fabricated homemade photoacoustic cell and a pre-amplifier device and optimized both for maximum sensitivity. The cavity volume is measured 4.80 × 10−6 m3 at optimum condition. Finally, the thermal diffusivity and thermal conductivity of undoped La2O3 oxide are measured. Thermal diffusivity has been found from 2.481 × 10‒6 to 2.530 × 10‒6 m2/s for the excitation power density range (63.69–87.57)×108 mW/m2. Conversely, the thermal conductivity has been measured from 5.067 to 5.168 Wm‒1k‒1 for the same excitation condition. Finally, the absorption spectrum of the sample is recorded by excited the sample with 500 Watt Xenon source varying wavelength. The absorption peaks are found near 967, 1310, and 1420 nm, respectively. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Photoacoustic spectroscopy is a unique experimental technique for material characterization in any phase such as solid, liquid, gas, or condensed medium. The thermal properties like thermal diffusivity or thermal conductivity have been measured by recorded photoacoustic signals varying chopping frequency under 980 nm diode laser sources. In this work, the authors have fabricated homemade photoacoustic cell and a pre-amplifier device and optimized both for maximum sensitivity. The cavity volume is measured 4.80 × 10−6 m3 at optimum condition. Finally, the thermal diffusivity and thermal conductivity of undoped La2O3 oxide are measured. Thermal diffusivity has been found from 2.481 × 10‒6 to 2.530 × 10‒6 m2/s for the excitation power density range (63.69–87.57)×108 mW/m2. Conversely, the thermal conductivity has been measured from 5.067 to 5.168 Wm‒1k‒1 for the same excitation condition. Finally, the absorption spectrum of the sample is recorded by excited the sample with 500 Watt Xenon source varying wavelength. The absorption peaks are found near 967, 1310, and 1420 nm, respectively. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09574522 |
| DOI: | 10.1007/s10854-023-11146-7 |
