Thermal conductivity measurements of Yb:CaF2 transparent ceramics using the 3 ω method

This paper reports on the measurement of the thermal conductivity of ytterbium doped CaF2 transparent ceramics using the 3ω method. Samples with different doping levels were studied in a temperature range of 10 K to 310 K. The results for doped samples are very similar to those obtained for Yb:CaF2...

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Bibliographic Details
Published in:Journal of applied physics 2017-06, Vol.121 (24)
Main Authors: Sarthou, J., Duquesne, J.-Y., Becerra, L., Gredin, P., Mortier, M.
Format: Article
Language:English
Subjects:
Applied physics
Calcium fluoride
Ceramics
Doping
Grain boundaries
Heat conductivity
Heat transfer
Single crystals
Thermal conductivity
Thermodynamic properties
Ytterbium
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Summary:This paper reports on the measurement of the thermal conductivity of ytterbium doped CaF2 transparent ceramics using the 3ω method. Samples with different doping levels were studied in a temperature range of 10 K to 310 K. The results for doped samples are very similar to those obtained for Yb:CaF2 single crystals with the same doping levels, which demonstrates an important improvement in the thermal properties of transparent ceramics. However, the results obtained for non-doped ceramics and single crystals differ for the maximum conductivity due to the presence of grain boundaries inside the ceramic. Theoretical calculations were also conducted using Callaway's model and are in a very good agreement with experimental results. The fitting parameters found tend to indicate that the introduction of a doping element in the lattice has more impact on thermal conductivity than the presence of grain boundaries in the material.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4990282