Effects of Ca²⁺-Doping on the Crystal Lattice of α-Fe₂O₃

Abstract:

Samples of Ca_yFe_12-yO₁₉ (0 ≤ y ≤ 1.0) were prepared by a proteic sol–gel process with hematite phase and clusters of M-type calcium hexaferrite. Impedance analysis showed that the resistivity increased with calcium concentration in the 0.0 < y ≤ 0.2 range, but decreased for y > 0.2. The saturation of the electrical resistivity occurred at 7.5 × 10⁶ Ω·cm for Ca_0.9Fe_11.1O₁₉. The plot of magnetization as a function of the magnetic field showed high values of saturation magnetization (40 emu/g) with low remanence (6.7 emu/g) and coercive field (320 Oe).

• Periodical: Advanced Materials Research (Volume 975)
• Pages: 116-121
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.975.116
• Online since: July 2014
• Authors: Bruna da Costa Andrade*, José Cleverton da Conceição Passos, Marcelo Andrade Macedo
• Keywords: Exchange Bias, Magnetic Property, Resistivity

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