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Effect of Er doping on the structural and magnetic properties of cobalt-ferrite.
- Source :
- Journal of Applied Physics; 2014, Vol. 115 Issue 17, p17A502-1-17A502-3, 3p, 1 Chart, 4 Graphs
- Publication Year :
- 2014
-
Abstract
- Nanocrystalline particulates of Er doped cobalt-ferrites CoFe<subscript>(2-x)</subscript>Er<subscript>x</subscript>O<subscript>4</subscript> (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 4h) 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<superscript>+3</superscript> compared to Fe<superscript>+3</superscript>. Greater than two-fold increase in coercivity (~66 kA/m for x=0.02) was observed in doped cobalt-ferrites compared to CoFe<subscript>2</subscript>O<subscript>4</subscript> (~29 kA/m). [ABSTRACT FROM AUTHOR]
- Subjects :
- MAGNETIC properties
MALIC acid
OXIDIZING agents
X-ray diffraction
ISOSTATIC pressing
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 115
- Issue :
- 17
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 95982375
- Full Text :
- https://doi.org/10.1063/1.4854915