Paraelectric and ferroelectric phase structures of SrBi2Ta2O9 (SBT) and Bi4Ti3O12 (BiT) were calculated using first-principle density functional theory (DFT).Berry phase method is used to study the sp
Since the perovskite-related CaCu3Ti4O12 (CCTO) has been reported to have a colossal dielectric constant in the order of 105 and to stay almost constant in a wide temperature range,which presents prom