Abstract
Single-phase multiferroic Bi1-xTbxFeO3 (xBTFO, x=0.00, 0.03, 0.06 and 0.09) films were deposited on quartz substrates by chemical solution deposition. X-ray diffraction patterns indicate that all films exhibit a distorted pseudo-tetragonal perovskite structure with a high degree of (110) preferred orientation. The Tb-doping at A-site of BiFeO3 (BFO) results in lattice contraction, improves surface morphology and reduces the average grain size of the films. One A mode and five E modes of films are observed in Raman scattering spectra, and the position of A mode shifts to higher wavenumber with the increasing of x due to the enhanced Bi–O covalent by Tb doping. With increasing x from 0.00 to 0.09, the saturation magnetization of xBTFO films increases and can be expressed by Ms=(34.6x+1.1) emu/cm−3, originating from different bond interactions between 4f, 5d orbitals of Tb–O and 6p orbitals of Bi–O. Compared with BFO film, the band gap of xBTFO films decreases, which is mainly due to the increased the tailing of the conduction band edge into the band-gap, which is leading to decreasing the band gap.
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