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The effect of transition metal doping on thermal conductivity of YB66
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Takaho Tanaka
Published/Copyright:
September 25, 2009
Abstract
The effect of transition metal doping in YB66 has been studied with respect to increase its thermal conductivity. Single crystals of YB66 doped with 4th, 5th and 6th group transition metals were grown by floating zone method. A detailed structure analysis suggested that an existing special B—B pair at the (1/4, 1/4, 1/4) site of YB66 could be attributed to a phonon scattering center that causes the amorphous-like low thermal conductivity. It was found that 5th and 6th group transition metals of V, Cr, Nb and Mo substitute the B—B pair. By contrast 4th group transition metals such as Ti and Zr were found to enter another (x, x, x) site with x ∼ 0.135. Thermal conductivity of both Nb-doped and undoped YB66 was measured in the range 4 K ≤ T ≤ 150 K. Nb doping increased thermal conductivity of YB66 with a factor of about 2.
Keywords: Thermal conductivity; Boron icosahedron cluster compound; Yttrium boride; Transition metal doping; Single crystal structure analysis; X-ray diffraction
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Published Online: 2009-9-25
Published in Print: 2006-5-1
© by Oldenbourg Wissenschaftsverlag, München
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Keywords for this article
Thermal conductivity;
Boron icosahedron cluster compound;
Yttrium boride;
Transition metal doping;
Single crystal structure analysis;
X-ray diffraction
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