Estimation of the cation distribution in Co3-XNiXO4 (0 ≤ X ≤ 1.28) synthesized from crystallized Co1-YNiY(OH)2 (X = 3Y) prepared by the uniform precipitation method

• Published in: Journal of magnetism and magnetic materials 2021-02, Vol.519, p.1, Article 167479
• Main Authors: Hayashi, Kensuke, Yamada, Keisuke, Shima, Mutsuhiro
• Format: Article
• Language: English
• Subjects: Cation distribution; Cations; Co1-YNiY(OH)2; Co3-XNiXO4; Crystal lattices; Crystal structure; Crystallization; Crystals; Lattice parameters; Magnetic properties; Magnetic saturation; Magnetic transitions; Magnetization; Parameter estimation; Spinel oxide; Transition temperature
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2020.167479

•Co3-XNiXO4 powder samples were synthesized from Co1-YNiY(OH)2 (X = 3Y).•The saturation magnetization MS at 5 K is the maximum when X  = 0.74.•The magnetic transition temperature TN reaches to 290 K at X  = 1.28.•The distribution of cations in Co3-XNiXO4 is estimated from MS at 5 K. The crystal structure and magnetic properties of Co3-XNiXO4 (CNO) (0 ≤ X ≤ 1.28) powder samples produced from uniformly precipitated Co1-YNiY(OH)2 (X = 3Y) precursors were investigated herein. The X-ray diffraction analysis of the samples showed that they had a cubic spinel structure when 0 ≤ X ≤ 1.28. With increasing nickel content (X), the saturation magnetization per formula unit MS at 5 K increased from 0 μB at X  = 0 to 0.97 μB at X  = 0.74, and subsequently decreased to 0.78 μB at X  = 1.28. When X  ≥ 0.23, the magnetic transition temperature increased from 35 K at X  = 0.23 to 290 K at X  = 1.28. The distribution of the cations in the crystal was estimated from the lattice parameters and saturation magnetization data, MS-Exp, measured at 5 K. The estimated compositional dependence of the saturation magnetization MS-Fit was consistent with the observed trend in the MS-Exp.