Effect of Er doping on the structural and magnetic properties of cobalt-ferrite

Journal Article · Wed May 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4854915· OSTI ID:22273937

Prathapani, Sateesh; Vinitha, M.; Jayaraman, T. V. ^[1]

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1. Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, Nebraska 68588 (United States)

Nanocrystalline particulates of Er doped cobalt-ferrites CoFe{sub (2−x)}Er{sub x}O{sub 4} (0 ≤ x ≤ 0.04), were synthesized, using sol-gel assisted autocombustion method. Co-, Fe-, and Er- nitrates were the oxidizers, and malic acid served as a fuel and chelating agent. Calcination (400–600 °C for 4 h) of the precursor powders was followed by sintering (1000 °C for 4 h) and structural and magnetic characterization. X-ray diffraction confirmed the formation of single phase of spinel for the compositions x = 0, 0.01, and 0.02; and for higher compositions an additional orthoferrite phase formed along with the spinel phase. Lattice parameter of the doped cobalt-ferrites was higher than that of pure cobalt-ferrite. The observed red shift in the doped cobalt-ferrites indicates the presence of induced strain in the cobalt-ferrite matrix due to large size of the Er{sup +3} compared to Fe{sup +3}. Greater than two-fold increase in coercivity (∼66 kA/m for x = 0.02) was observed in doped cobalt-ferrites compared to CoFe{sub 2}O{sub 4} (∼29 kA/m)

• OSTI ID: 22273937
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
CALCINATION
CHELATING AGENTS
COBALT OXIDES
COERCIVE FORCE
COMPARATIVE EVALUATIONS
DOPED MATERIALS
ERBIUM COMPOUNDS
FERRITES
IRON IONS
LATTICE PARAMETERS
MAGNETIC PROPERTIES
NANOSTRUCTURES
NITRATES
PARTICULATES
RED SHIFT
SINTERING
SOL-GEL PROCESS
SPINELS
X-RAY DIFFRACTION