Abstract
Abstract Photo induced catalysis phenomena is attracting enormous method for solving environmental as well as current energy related issues through conversion of solar light into chemical energy. In the present work, we investigated structural, conduction, ferroelectric and photocatalytic behaviors of Bi0.84RE0.16FeO3 (RE = La, Gd) nano particles (NPs) prepared via sol-gel method. The XRD (X-ray Diffraction) analysis revealed the rhombohedral crystal structure with the space group R3c of BFO (BiFeO3). Rare earth substitution on Bi site in BFO entourage to several structural changes and the usual average crystallite (domain) size were obtained 15 nm and 17 nm, respectively. The lattice strain values were calculated by W–H method. The photo-catalytic activity of BLFO and BGFO were studied via degradation of MB (Methylene Blue) dye in aqueous solution under the visible light (λ ≥ 488 nm) illumination. The energy band of Bi0.84La0.16FeO3 (BLFO) and Bi0.84Gd0.16FeO3 (BGFO) were observed 2.05 eV and 1.92 eV, respectively. The morphological studies were carried out by using FESEM. The dielectric constant (e′), dielectric loss (tanδ) and conductivities (σAC (ω)) were measured as a function of variable frequency ω (5 MHz–10 Hz) with the varieties of temperatures. Significant reductions within the dielectric constant e′ have been examined with the increase in frequency and the enhancement in dielectric constant e′ with the increase in the valuable temperature. The remnant polarization (2Pr) values for Bi0.84La0.16FeO3 and Bi0.84Gd0.16FeO3 samples are found 0.43 μC/cm2 and 0.28 μC/cm2, respectively. The saturation polarization (Ps) values for Bi0.84La0.16FeO3 and Bi0.84Gd0.16FeO3 samples are found 0.65 μC/cm2 at the practical field 20 kV/cm and 0.88 μC/cm2 at the practical field 15 kV/cm, respectively. The catalysis degradation efficiencies for BGFO and BLFO samples were found 96.8% and 83.5%, respectively.
Published Version
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