Influence of LaMnO3 Nanocrystallite Size on its Optical and Raman Spectra

被引：0
作者：
Shukur, Mohd Abdul [1 ,2 ]
Kumar, K. Vijaya [1 ]
Rao, G. Narsinga [3 ]
机构：
[1] Department of Physics, JNTUH University College of Engineering Jagtial (Autonomous), Jagtial-District, Telangana, Nachupally (Kondagattu)
[2] Department of Physics, SRR Government Arts & Science College Karimnagar (Autonomous), Karimnagar-District, Telangana
[3] Department of Physics, Marri Laxman Reddy Institute of Technology and Management (Autonomous), Telangana, Dundigal Hyderabad
来源：
Current Materials Science | 2024年 / 17卷 / 05期
关键词：
LaMnO[!sub]3[!/sub] nanocrystallites; optical band gap; raman spectra; UV-vis spectroscopy; vibrational modes; XRD;
D O I：
10.2174/0126661454260630231221062043
中图分类号：
学科分类号：
摘要：
In the current study, nanocrystalline LaMnO3 perovskite was prepared by combustion method and annealed at different annealing temperatures. The X-ray diffraction (XRD) patterns provided evidence that the structure formed has a Rhombo-hedral structure with R3 ̅c space group. The remarkable growth in the crystallite size, reduction in microstrain, and dislocation density were observed with annealing temperature. Ultraviolet-visible spectroscopy was used to determine the optical band gap by the Tauc-plot method. The optical band gap was found to be 3.5 ± 0.4eV and 2.9 ± 0.5eV for 600°C and 1200°C annealed samples, respectively. The observed results were influenced by crystallite size. Raman spectra of the LaMnO3 nanocrystallites revealed five Raman-active modes, like out-of-phase rotation modes and bending mode of MnO6 octahedra. Moreover, the intensity of vibrational modes also varied significantly with annealing temperature. © 2024 Bentham Science Publishers.
引用
收藏
页码：491 / 497
页数：6
相关论文
共 28 条
  • [1] Kugel' KI, Khomskii DI., The Jahn-Teller effect and mag-netism: Transition metal compounds, Sov Phys Usp, 25, 4, pp. 231-256, (1982)
  • [2] Gehring GA, Gehring KA., Co-operative Jahn-Teller ef-fects, Rep Prog Phys, 38, 1, pp. 1-89, (1975)
  • [3] Tang FL, Huang M, Lu WJ, Yu WY., Structural relaxation and Jahn–Teller distortion of LaMnO3 (001) surface, Surf Sci, 603, 6, pp. 949-954, (2009)
  • [4] Markovich V, Jung G, Fita I, Et al., Magnetotransport in granular LaMnO<sub>3+δ</sub> manganite with nano-sized particles, J Phys D Appl Phys, 41, 18, (2008)
  • [5] Hu J, Men J, Ma J, Huang H., Preparation of LaM-nO3/graphene thin films and their photocatalytic activity, J Rare Earths, 32, 12, pp. 1126-1134, (2014)
  • [6] Hu J, Liu Y, Men J, Zhang L, Huang H., Ag modified LaMnO3 nanorods-reduced graphene oxide composite applied in the photocatalytic discoloration of direct green, Solid State Sci, 61, pp. 239-245, (2016)
  • [7] Gao P, Li N, Wang A, Wang X, Zhang T., Perovskite LaMnO3 hollow nanospheres: The synthesis and the appli- cation in catalytic wet air oxidation of phenol, Mater Lett, 92, pp. 173-176, (2013)
  • [8] Wollan EO, Koehler WC., Neutron diffraction study of the magnetic properties of the series of perovskite-type compounds [(1-x) La, xCa] Mn O 3, Phys Rev, 100, 2, pp. 545-563, (1955)
  • [9] Manh DH, Phong PT, Thanh TD, Nam DNH, Hong LV, Phuc NX., Size effects and interactions in La0.7Ca0.3 MnO3 nanoparticles, J Alloys Compd, 509, 5, pp. 1373-1377, (2011)
  • [10] Navin K, Kurchania R., The effect of particle size on struc-tural, magnetic and transport properties of La0.7Sr0.3 MnO3 nanoparticles, Ceram Int, 44, 5, pp. 4973-4980, (2018)
123