Effects of Na-Doping on Structure and Magnetic Properties of LaCoO₃

Abstract:

Effect of Na doping on the structural and magnetic properties of La_1-xNa_xCoO₃ (0≤x≤0.4) nanopowder samples synthesized by sol-gel method have been investigated. Rietveld crystal structure refinement of the X-ray diffraction data shows that La_1−xNa_xCoO₃ (x≤0.3) crystallizes in the rhombohedral structure with space group . The lattice parameters decrease and the crystallite sizes increase with the increase of x. For the sample with x=0.4, a secondary hexagonal phase NaCo₂O₄ was observed. The zero field cooling (ZFC) and field cooling (FC) curve of the samples (x≤0.3) exhibit a paramagnetic-ferromagnetic transition with decreasing temperature.

• Periodical: Key Engineering Materials (Volume 727)
• Pages: 403-409
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.727.403
• Online since: January 2017
• Authors: Yi Hao Shen, Qing Rong Yao*, Peng Cheng Yang, Jian Qiu Deng, Zong Min Wang
• Keywords: Magnetic Spin-State, Rhombohedral Phase Separation, X-Ray Diffraction

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