Microstructure and magnetic properties of spinel ferrites

Conference · Thu Jan 01 04:00:00 EST 1976 · AIP (Am. Inst. Phys.) Conf. Proc.; (United States)

OSTI ID:7332672

Mishra, R K; Thomas, G

Achieving suitable magnetic properties in ceramic ferrites through thermomechanical treatments rather than through varying the processing and fabrication parameters alone are investigated. The high temperature phase transformation in lithium ferrite (LiFe/sub 5/O/sub 8/) spinel and the defects in LiFe/sub 5/O/sub 8/ and NiFe/sub 2/O/sub 4/ are studied using high voltage transmission electron microscopy in an effort to characterize the microstructures. Results show that a dispersion of paramagnetic LiFeO/sub 2/ particles in LiFe/sub 5/O/sub 8/ matrix gives rise to increased squareness of the hysteresis curve and increased coercivity. Annealing treatments of sintered ferrites remove undesirable intra-granular (100)/sup 1///sub 4/(110) cation stacking faults and improve hysteresis loop parameters.

• Research Organization: Univ. of California, Berkeley
• OSTI ID: 7332672
• Conference Information: Journal Name: AIP (Am. Inst. Phys.) Conf. Proc.; (United States) Journal Volume: 34
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
ANNEALING
CERAMICS
CRYSTAL STRUCTURE
DEFECTS
FABRICATION
FERRIMAGNETIC MATERIALS
FERRITES
HEAT TREATMENTS
IRON COMPOUNDS
LITHIUM COMPOUNDS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MATERIALS WORKING
MICROSTRUCTURE
NICKEL COMPOUNDS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
TRANSITION ELEMENT COMPOUNDS