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Structural, magnetic, and electrical evaluations of rare earth Gd3+ doped in mixed Co–Mn spinel ferrite nanoparticles

Yousaf, M ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2021.09.136
  3. Publisher: Elsevier Ltd , 2022
  4. Abstract:
  5. The controlled and stable crystal structure, reduction in Curie temperature and semiconducting nature of oxide materials are the key factors for magnetoelectrical applications. Therefore, Co0.6Mn0.4GdxFe2-xO4 where x = 0, 0.033, 0.066 and 0.10 were synthesized to analyse the structural, morphological, magnetic, and electrical properties using a sol-gel autocombustion approach. The X-ray diffraction pattern reveals that the cubic crystallite size decreases with increasing smaller content of Gd3+ oxides without any secondary phase. Field emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM) study explain the complete morphology, agglomeration and dense structure of rare earth-doped Gd oxide in the mixed Co–Mn spinel ferrite nanoparticles. Fourier transform infrared spectra confirms the formation of a spinel structure with absorption bands below 1000 cm−1. The magnetic analysis shows that the saturation magnetization (59.20 emu/g - 49.71 emu/g) and coercivity (985.21 Oe – 254.11 Oe) of the synthesized samples decreased with increasing content of Gd3+ ions. The increase in DC conductivity with increasing temperature verifies the semiconducting nature of the synthesized samples, and a higher DC conductivity of the Co0.6Mn0.4Gd0.10Fe1.90O4(CMGF3) samples was observed at approximately 0.0362 S/cm at 973 K temperature. © 2021
  6. Keywords:
  7. Magnetic properties ; Spinel ferrite ; Thermal analysis ; Crystal structure ; Crystallite size ; Enamels ; Ferrite ; Field emission microscopes ; Gadolinium compounds ; High resolution transmission electron microscopy ; Iron compounds ; Manganese compounds ; Nanomagnetics ; Rare earths ; Saturation magnetization ; Scanning electron microscopy ; Sol-gels ; DC conductivity ; Electrical evaluations ; Mn spinels ; Rare earth Gd ; Rare earth gd oxide ; Rare-earths ; Spinel ferrites ; Spinel-ferrite nanoparticles ; Structural evaluation ; Synthesised ; Thermoanalysis
  8. Source: Ceramics International ; Volume 48, Issue 1 , 2022 , Pages 578-586 ; 02728842 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0272884221029308