Compared to the flagship thermoelectrics SnSe and Bi 2 Te 3 , the κ/τ CRTA at 300 K are much larger (3.24-9.12 W m -1 K -1 ps -1 compared to 0.37 and 0.2 W m -1 K -1 ps -1 for SnSe and Bi 2 Te 3 ), whereas the τ CRTA are shorter (0.48-1.37 ps compared to 4.23/4.41 ps for SnSe/Bi 2 Te 3 )). This is consistent with the stronger bonding in oxides, which would both produce larger group velocities but also stronger phonon interactions, and suggests that the common strategies for optimising the electrical properties (e.g. introducing oxygen vacancies and heavy doping) Table Average ZT for CaTiO 3 , SrTiO 3 and BaTiO 3 , calculated using Eq. 1, together with the associated carrier concentration n constituent Seebeck coefficient S, electrical conductivity σ , power factor S 2 σ (PF), and lattice, electronic and total thermal conductivity κ latt , κ el and κ tot . ZT values are given at four temperatures, viz. T = 400, 600 and 1000 K, corresponding roughly to the low-, medium-and high-temperatures outlined in Ref. , and the minimum temperature at which we predict ZT > 1 can be obtained (for BaTiO 3 we show the temperature at which the largest ZT is obtained). would likely have a synergistic effect of reducing the lattice thermal conductivity. We propose this as a topic for future study.