Abstract
The composite materials in the form of (1-x)BaTiO3-xSrFe0.5Nb0.5O3((1-x)BT-xSFN) are synthesized via the solid-state reaction route. Structure, optical behaviors, and electrical properties of (1-x)BT-xSFN are studied. It can be noted that the structure of the synthesized solid solution changes from the tetragonal phase to the cubic phase with increase of x-value. Due to the increase in content of double perovskite SFN, the optical band gaps of doped BT decrease to a minimum of 2.66 eV, which is smaller than that of pure BT (3.21 eV). However, the ferroelectric property deteriorates with the addition of dopants, which result from the lattice distortion caused by the substitution of Sr2+ and Fe3+/Nb5+ for Ba2+ and Ti4+, respectively. These results provide new insights into the control of the structure, optical behaviors and ferroelectric properties in BT-based oxides.
Highlights
Ferroelectric materials are a type of multifunctional materials with built-in electric field of spontaneous polarization
The X-ray diffraction (XRD) patterns of the (1-x)BT-xSFN (x = 0.00, 0.02, 0.05, 0.10, 0.15) ceramics at 2θ of 10°-70° are depicted in Fig. 1(a), corresponding to a polycrystalline perovskite structure
The peaks of the prepared pure BT are indexed as the tetragonal structure of the P4mm space group (PDF#05-0626), which is consistent with the earlier report [28]
Summary
Ferroelectric materials are a type of multifunctional materials with built-in electric field of spontaneous polarization. Hansen et al [22] reported that the substitution of Sr2+ ions for Ba2+ ions is conducive to obtaining better surface properties, maintaining the tetragonal lattice of BT, and improving its electrical performance.
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