Shock-modified transition metal ferrites

Technical Report · Mon Jun 01 04:00:00 EDT 1987

OSTI ID:6359892

Venturini, E L; Morosin, B; Graham, R A; Williamson, D L; Williams, F L

The physical properties of four spinel-structure ferrite powders (copper, cobalt, nickel and iron ferrite), subjected to high pressure shock loading and preserved for post-shock analysis, have been studied by x-ray diffraction, static magnetization and Moessbauer spectroscopy. X-ray diffraction shows residual strains typically greater than 0.1%, indicative of large shock-induced plastic deformation. Static magnetization reveals major strain-induced changes in magnetostrictive energies of magnitudes comparable to magnetocrystalline energies. At high applied magnetic fields it is found that saturation magnetization, magnetic hardness and magnetic susceptibility are strongly altered by the shock-modification process. Moessbauer measurements show apparent changes in magnetic-ion site distributions attributed to a reduction in crystallite size. There is evidence that about 15% of the magnetite is converted to hematite by the shock process. In summary, the shock-modified ferrite powders show major changes in their magnetic characteristics. Shock modification is shown to be an effective process to achieve unique states in these materials.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA); Colorado School of Mines, Golden (USA); New Mexico Univ., Albuquerque (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6359892
• Report Number(s): SAND-87-0315; ON: DE87012340
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COBALT COMPOUNDS
COHERENT SCATTERING
COPPER COMPOUNDS
DIFFRACTION
FERRIMAGNETIC MATERIALS
FERRITES
HYSTERESIS
IRON COMPOUNDS
IRON OXIDES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETOSTRICTION
MATERIALS
MINERALS
MOESSBAUER EFFECT
NICKEL COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SHOCK WAVES
SPINELS
STRAINS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION