Thermal Wave Measurements with a Mirage Detection for Investigation of Thermal Diffusivity of GdCa4O(BO3)3 Single Crystals
J. Bodzenta a, A. Kaźmierczak-Bałata a, T. Łukasiewicz b, B. Hofman b and J. Kucytowski c
a Institute of Physics, Silesian University of Technology, Krzywoustego 2, 44-100 Gliwice, Poland
b Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warszawa, Poland
c Institute of Materials Science, University of Silesia, Bankowa 12, 40-007 Katowice, Poland
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Single crystals of GdCa4O(BO3)3 were examined to determine their thermal properties. Samples were grown by the Czochralski pulling technique. There were three types of samples: a pure crystal, the crystal doped with neodymium (4 at.% of Nd), and the third one doped with ytterbium (7 at.% of Yb). All samples were rectangular prisms with edges parallel to the axes of the optical indicatrix X, Y, Z (principal axes). The thermal diffusivity was determined by means of the thermal wave method with the optical detection of the temperature disturbance based on a mirage effect. Experimental results showed anisotropy of the thermal diffusivity. The thermal diffusivity along Y direction has the highest value while values obtained in X and Z axes are much lower. Dopants cause decrease in the thermal diffusivity for all investigated directions.
DOI: 10.12693/APhysPolA.114.A-27
PACS numbers: 42.55.Tv, 42.70.Hj, 65.40.-b, 66.30.Xj, 66.70.-f