Abstract
The measurement of specific heat and thermal conductivity at low temperature for isotopically modified boron single crystals was performed between 0.5 and 100 K using relaxation method and steady heat flow method, respectively. The results indicate that the specific heat has obvious divergences at T <5 K. At 40 K, the thermal conductivity of 10B- enriched crystal is about 570W/m-K, which is 40% larger than that of natural boron crystal. The influence of lattice vibration modes and the isotopic effect on specific heat and thermal conductivity for isotopically modified boron are discussed.
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