Micron-scale SrTiO3 powders were synthesized from SrCO3 and TiO2 powders using standard solid state procedures. The particle size was measured to be 1.5±0.5 mm from SEM (Fig. S1a). Nanoscale SrTiO3 and TiO2 were obtained and used as received (crystallite size < 100 nm, and < 25 nm respectively) with particle sizes confirmed in Fig.S1 b–d. XRD of the SrTiO3 and TiO2 powders as produced/received are given in Fig. S2.