Magnetic and magneto elastic properties of cobalt ferrite ceramic compacted through cold isostatic pressing

Journal Article · Fri May 06 00:00:00 EDT 2016 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4946551· OSTI ID:22606555

Indla, Srinivas; Das, Dibakar ^[1]; Chelvane, Arout ^[2]

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1. School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad 500046 (India)
2. Advanced Magnetic Group, Defense Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500058 (India)

Nano crystalline CoFe{sub 2}O{sub 4} powder was prepared by combustion synthesis method. As synthesized powder was calcined at an appropriate condition to remove the impurities and to promote phase formation. Phase pure CoFe{sub 2}O{sub 4} powder was pressed into cylindrical rod at an applied pressure of 200 MPa using a cold isostatic pressing. Sintering of the green compact at 1350°c for 12 hrs resulted in sintered cylindrical rod with ~85% of the theoretical density. Single phase cubic spinel structure was observed in the powder x-ray diffraction pattern of the sintered pellet. Scanning electron micrographs (SEM) of the as sintered pellet revealed the microstructure to be composed of ferrite grains of average size ~4 µm. Saturation magnetization of 72 emu/g and coercivity of 355 Oe were observed for cobalt ferrite sample. The magnetostriction was measured on a circular disc (12 mm diameter and 12 mm length) with the strain gauge (350 Ω) mounted on the flat surface of the circular disc. Magnetostriciton of 180 ppm and strain derivative of 1 × 10{sup −9} m/A were observed for the sintered CoFe{sub 2}O{sub 4} sample.

• OSTI ID: 22606555
• Journal Information: AIP Conference Proceedings, Vol. 1728, Issue 1; Conference: ICC 2015: International conference on condensed matter and applied physics, Bikaner (India), 30-31 Oct 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CERAMICS
COBALT COMPOUNDS
COERCIVE FORCE
DENSITY
ELASTICITY
FERRITES
IMPURITIES
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETOSTRICTION
MICROSTRUCTURE
NANOSTRUCTURES
POWDERS
PRESSURE RANGE MEGA PA
SATURATION
SCANNING ELECTRON MICROSCOPY
SINTERING
STRAIN GAGES
X RADIATION
X-RAY DIFFRACTION