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The layered oxides demonstrate a lower thermal conductivity than their non-layered counterpart materials. 1,2 The thermal conductivity of the layered oxides has a strong anisotropy. For example, Bi 2−x Pb x Sr 2 Co 2 O y (x = 0, 0.4, and 0.6) has an out-of-plane thermal conductivity of 0.4 W/m K at room temperature (RT), 3 while its in-plane thermal conductivity is up to 3.5 W/m K. 4 Interestingly, Shen Y et al reported that the low thermal conductivity of layered Bi 4 Ti 3 O 12 persisted up to at least 1000°C despite a change in the crystal structure at 675°C. This work indicates that the low thermal conductivity of the layered Bi 4 Ti 3 O 12 is associated with the layered structure of the compound rather than the detailed arrangement of

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