Showing papers by "Huijun Ren published in 2013"
TL;DR: In this article, the surface morphology of the BGFCO thin film becomes more compact and uniform than that of the other two films, whereas 10% Gd doping gives rise to a tetragonal phase transition and (1.1) preferentially oriented film texture for the BFO thin film, as evidenced by Raman scattering spectra and X-ray diffraction analyses.
26 citations
TL;DR: In this paper, the effects of co-doped BiFeO3 thin films on the microstructure and electric properties of the BFO and BFMCO were studied.
Abstract: Pure BiFeO3 (BFO) and (Mn, Cr) co-doped BiFe0.96−yMn0.04CryO3 thin films were prepared on FTO/glass (SnO2:F) substrates by using a sol–gel method. The effects of (Mn, Cr) co-doped on the microstructure and electric properties of the BiFeO3 thin films were studied. The result indicates that the co-doped BiFe0.94Mn0.04Cr0.02O3 (BFMCO) thin film has a structure transition and better ferroelectric properties compared with the pure BFO thin film. The Rietveld refined XRD patterns of BFO and BFMCO thin films conform the trigonal (R3c:H) and the biphasic (R3c:H + R3m:R) structure, respectively. The co-existence of two phases and the mixed valences of Cr3+/6+ and Mn2+/3+, which apparently improves the electric properties of the (Mn, Cr) co-doped BFMCO thin films. The remnant polarization (P
r) of the BFMCO thin film was 93.58 μC/cm2 at 1 kHz in the applied electric field of 636 kV/cm. At an applied electric field of 100 kV/cm, the leakage current density of (Mn, Cr) co-doped BFMCO thin film is 6.2 × 10−6 A/cm2. It is about three orders much lower than that of the BFO thin film (1.43 × 10−3 A/cm2).
14 citations