Investigation of structural, morphological, optical, and magnetic properties of Sm-doped LaFeO3 nanopowders prepared by sol–gel method
- 344 Downloads
Pure orthorhombic phase of La1−xSmxFeO3 (x = 0, 0.1, 0.2, and 0.3) nanoparticles can be obtained by sol–gel method after calcination at 800 °C for 3 h in air. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray absorption near edge spectroscopy, ultraviolet-visible spectroscopy, and vibrating sample magnetometry were used to study the crystal structure, morphology, oxidation state, functional group, optical, and magnetic properties of samples. Pure orthorhombic phase of perovskite structure is confirmed by X-ray diffraction results. Decreasing lattice parameters, crystallite sizes, and cell volumes with increasing microstrains indicate structure distortion due to the substitution of Sm ions with small ionic radius on the La sites in the orthorhombic structure. Scanning electron microscopy and transmission electron microscopy images show a homogeneous distribution of almost spherical nanoparticles with decreasing average particle sizes ranging from 56.48 ± 3.22 to 23.21 ± 4.40 nm for samples of high Sm content. Fourier transform infrared spectroscopy spectra confirm the Fe–O stretching mode in octahedral FeO6 unit of a perovskite structure. X-ray photoelectron spectroscopy and X-ray absorption near edge spectroscopy results indicate the oxidation states +3 of La and Fe ions. The optical band gaps are found to decrease from 2.218 to 1.880 eV with increasing Sm content. vibrating sample magnetometry results show the antiferromagnetic behavior of undoped sample and ferromagnetic behavior for doped samples, affecting by structure distortion and particle size reduction. Interestingly, the coercive field is significantly enhanced from 95.07 Oe (x = 0.1) to 13,062.79 Oe (x = 0.3). Curie temperature (T c) is suggested to be above 400 K.
The magnetization curves of La1-xSmxFeO3 (x = 0.0, 0.1, 0.2, and 0.3) nanoparticles prepared by the sol-gel method with the inset show the comparing coercive forces (Hc) of the present work and the previous works, La0.7M0.3FeO3 (M = Al and Ga). Sm-doped LaFeO3 nanoparticles can exhibit ferromagnetic behavior with the significant enhancement of Hc from 95.07 to 13,062.79 Oe. Open image in new window
KeywordsSm-doped LaFeO3 Sol–gel method Optical properties Magnetic properties
This work was financially supported by the Integrated Nanotechnology Research Center (INRC), Department of Physics, Faculty of Science, Khon Kaen University, Thailand. Financial assistance also comes from the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission and the Nanotechnology Center (NANOTEC), NSTDA, Ministry of Science and Technology, Thailand through its program of Center of Excellence Network. Thanks are due to Rajamangala University of Technology Rattanakosin Wang Klai Kangwon Campus, Thailand (Grant A21/2559) for co-providing financial support.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no competing interests.
- 6.Khetre SM, Chopade AU, Khilare CJ, Kulal SR, Jadhav HV, Jagadale PN, Bangale SV, Bamane SR (2014) Ethanol gas sensing properties of nano-porous LaFeO3 thick films. J of Shivaji Uni (Sci & Tech) 41(2):250–5347Google Scholar
- 7.Minh DL, Mai Hoa VN, Ngoc Dinh N, Thi Thuy N (2013) Electric and thermoelectric properties of LaFeO3 compounds doped by Ti, Co and Cu ions. VNU J Mathematics Physics 29(3):42Google Scholar
- 10.Thirumalairajan S, Girija K, Mastelar VR, Ponpandian N (2015) Investigation on magnetic and electric properties of morphologically different perovskite LaFeO3 nanostructures. J Mater Sci: Mater Electron. 26:8652–8662Google Scholar
- 17.Lee YC, Parkhomov AB, Krishnan KM (2010) Size-driven magnetic transitions in monodisperse MnO nanocrystals. J Appl Phys 107: 09E124-1-3.Google Scholar
- 30.Tang P, Tong Y, Chen H, Cao F, Pan (2013) Microwave-assisted synthesis of nanoparticulate perovskite LaFeO3 as a high active visible-light photocatalyst. Appl Phys 13:340Google Scholar
- 36.Cullity BD, Stock SR (2001) Elements of X-ray Diffraction. 3rd edn, Prentice-Hall, Upper Saddle River, NJGoogle Scholar
- 38.Cho YG, Choi KH, Kim YR, Jung JS, Lee SH (2009) Characterization and catalytic properties of surface La-rich LaFeO3 perovskite. Bull Korean Chem Soc 30:6Google Scholar