High tunability and low loss via establishing an internal electric field in LiFe5O8/Ba0.6Sr0.4TiO3 composite films using chemical solution deposition method

Ultralow Loss and High Tunability in a Non‐perovskite Relaxor Ferroelectric

“…[31] The activation energy fitted by the Arrhenius equation gives the result of 80 ± 9 meV, see Figure S1 (Supporting Information). [32] Further fittings using classic oscillation model on far-infrared reflectivity and THz transmission spectra of the [24][25][26][27] Bi 6 Ti 5 WO 22 ceramic give a small permittivity, ≈150, which indicates only limited polarizations contribute to the permittivity at high frequencies, 10 MHz to 30 THz (Figure 1d). The reversiblenonlinear dielectric properties with a direct current (DC) bias field present the feasibility of the tunable dielectric where the permittivity decreases in an almost linear way to the bias field from ≈2200 at 0 kV cm −1 to ≈1250 at 30 kV cm −1 (Figure 1e), implying a ≈240 figure of merit (the ratio of dielectric loss to tunability), extensively higher than that of the (Ba,Sr)TiO 3 solid solution ceramics (≈60) (Figure 1f).…”

“…e) Reversiblenonlinear dielectric spectra with a DC bias field. f) Comparison of the tunability selected materials [24][25][26][27].…”

Ultra-high resistive switching current ratio and improved ferroelectricity and dielectric tunability performance in a BaTiO3/La0.7Sr0.3MnO3heterostructure by inserting a SrCoO2.5layer

“…These results show high dielectric tunability in both BTO and BTO/SCO, which are very competitive with the currently studied tunable ferroelectrics. 8,43–45 The tunability of the BTO films was enhanced by 8.6%, which was attributed to the introduction of SCO intercalation. BTO in the bilayer has greater out-of-plane strain, which is beneficial for inducing higher tunability in the films.…”

“…9,10 A LiFe 5 O 8 /Ba 0.6 Sr 0.4 TiO 3 composite film establishes an internal electric field, resulting in high dielectric tunability and low loss. 8 Besides, the nanoscaffold composite of Ba 0.6 Sr 0.4 TiO 3 and Sm 2 O 3 exhibits high tunability and low loss, thanks to the vertical strain control mechanism. 11 Recently, a nanocrystalline BTO columnar film grown on a LaNiO 3 buffer layer was reported, which has relatively high tunability and low loss.…”

“…[1][2][3][4][5][6][7] However, it is difficult to achieve both high dielectric tunability and low loss for the Ba 1−x Sr x TiO 3 ferroelectric film using linear dielectrics. 8 Growing the multilayer is an effective method for enhancing dielectric properties. The (Ba 0.5 Sr 0.5 )TiO 3 /Ba(Zr 0.15 Ti 0.85 )O 3 multilayer realizes low loss and high tunability, attributed to its improved dielectric properties and reduced leakage current.…”