RESEARCH ON FINE PARTICLE MAGNETIC MATERIALS
Abstract
Ferromagnetic and ferrimagnetic fine particles were prepared by suitably heat treating coprecipitated oxalates of the systems Co-Fe, Ni-Fe and Cu-Fe in a wide range of compositions. Decomposition of the oxalates in H produced fine particle metals or alloys, decomposition in air produced ferrites at temperatures as low as 400 C. Smaller particles were prepared by addition of the oxalates into molten KNO3. Extremely fine particles were prepared by a precipitation process, and grown by a hydrothermal process providing a series of ferrite particles from 25 to several hundred angstroms. Magnetic measurements and physical measurements using xray diffraction, electron diffraction, and electron microscopy techniques were used. The magnetic and structural data were analyzed in terms of the theory of ferromagnetic fine particle. Metal borides of Ni, Fe, and Co were prepared as fine particles using Na borohydride as the precipitating agent. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1961
- Accession Number
- AD0269523
Entities
People
- W.j. Schuele
Organizations
- Franklin Institute