Investigations on multiferroic, optical and photocatalytic properties of lanthanum doped bismuth fer

Investigations On Multiferroic, Optical And Photocatalytic Properties Of Lanthanum Doped Bismuth Ferrite Nanoparticles

Manpreet Kaur1, K. L. Yadav2, Poonam Uniyal1*

1School of Physics and Materials Science, Thapar University, Patiala 147004, Punjab, India

2Smart Material Research Laboratory, Department of Physics, Indian Institute of Technology, Roorkee 247667, India  

Adv. Mater. Lett., 2015, 6 (10), pp 895-901

DOI: 10.5185/amlett.2015.5861

Publication Date (Web): Sep 18, 2015

E-mail: poonam.uniyal@thapar.edu

Abstract


Single phase Bi1-xLaxFeO3 nanoparticles have been successfully synthesized with varied concentration (0.0 ≤ x ≤ 0.2) for the photocatalytic degradation of an industrial dye. The room temperature X-ray diffraction (XRD) pattern of La3+ doped BiFeO3 nanoparticles reveals the structural phase transition from rhombohedral (R3c) to orthorhombic (Pnma) at x=0.1, which is further analyzed via Rietveld refinement. The La3+ doped BiFeO3 nanoparticles have much negative enthalpy of formation (ΔHf) than undoped BiFeO3. The particle size gradually decreases from ~132 to ~68 nm with La3+ doping. Magnetic and ferroelectric transition temperatures are found to be slightly shifted towards room temperature upto x= 0.1 and then higher temperature side which could be attribute to the particle size effect. All compositions presented weak ferromagnetic ordering, which indicates that the La3+ substitution in the BiFeO3 matrix released the latent magnetization. The increase in the energy band gap from 2.045 to 2.658 eV with cutoff wavelengths 639.58 and 513.061 nm for x=0.0 and 0.2 respectively, increases the visible light efficiency of photocatalytic activity in La3+ doped BiFeO3 samples. The photodegradation efficiency of La3+ doped BiFeO3 for azo-dye RB-5 is observed to be ~27% higher as compared to the undoped BiFeO3 (43% photodegradation efficiency), which makes it suitable for visible-light responsive photocatalysis for photocatalytic applications.

Keywords

Nanoparticles, multiferroic properties, optical properties, photocatalytic activity.

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