The predicted averaged thermal conductivities range fall in the order of CTO < STO ≈ BTO. The κ latt of CTO, STO and BTO are 3.2, 4.4 and 4.5 W m -1 K -1 at 300 K, and decrease sharply with temperature to 0.96, 1.4 and 1.3 W m -1 K -1 at 1000 K.