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

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)
Authors:
; ;  [1] ;  [2]
  1. School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad 500046 (India)
  2. Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, Nebraska 68588 (United States)
Publication Date:
OSTI Identifier:
22273937
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal 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)
Country of Publication:
United States
Language:
English
Subject:
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