1. Thermal conductivity measurements of Yb:CaF2 transparent ceramics using the 3 ω method
- Author
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J. Sarthou, Loïc Becerra, Patrick Gredin, J.-Y. Duquesne, and Michel Mortier
- Subjects
010302 applied physics ,Ytterbium ,Materials science ,Transparent ceramics ,Doping ,General Physics and Astronomy ,chemistry.chemical_element ,Mineralogy ,02 engineering and technology ,Conductivity ,Atmospheric temperature range ,021001 nanoscience & nanotechnology ,01 natural sciences ,Condensed Matter::Materials Science ,Thermal conductivity ,chemistry ,Condensed Matter::Superconductivity ,visual_art ,0103 physical sciences ,visual_art.visual_art_medium ,Condensed Matter::Strongly Correlated Electrons ,Grain boundary ,Ceramic ,Composite material ,0210 nano-technology - Abstract
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.
- Published
- 2017
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