Figure 3
(a–d) Dielectric permittivity as a function of dc electric field of BTSn11, BTSn15 and BTSn20 from bias electric field measurement taken at 10 kHz and at the temperature of 32 °C and 50 °C. The data of BTSn11 measured at 32 °C were fitted by Eq. (3); the data of BTSn11 measured at 50 °C, BTSn15 and BTSn20 were fitted by Eq. (4); and Johnson term and Langevin term were simulated by the fitting parameters. The insets in (a–d) are dielectric tunability of BTSn11, BTSn15 and BTSn 20 as a function of the electric field.
