“…In particular, the thermal conductivity has been investigated by a large number of workers [6][7][8][9][10][11][12][13][14][15][16] by considering various forms of the MgB 2 system, like different defect levels, different types of doping, and single or polycrystalline samples. The studies of the thermal conductivity (κ) of MgB 2 made by Sologubenko et al [9,13], Wu et al [15] and Anshukeva et al [16] is limited to low temperatures (T ≤ 100K) only and in these studies κ increases with temperature T within the considered temperature range. Other authors [6-8, 10-12, 14] have studied the thermal conductivity up to much higher temperature range (T ≤ 250K [7], T ≤ 275K [10,11], T ≤ 300K [6,8,12,14]).…”