''The Identity of ¹⁴N and ¹³C Contamination Dependence on the Heat Conductivity of Diamond Monocrystals''

¹⁴N and ¹³C contaminations reduce the heat conductivity of diamond single crystals. It is shown that the concentration dependence is for both isotopes identical and linear in logarithmic scale for small concentrations at ambient temperature. The slope, its identity for both isotopes and the logarithmic dependence remain to be explained.