Shock-modified transition metal ferrites

Technical Report · Mon Jun 01 00:00:00 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
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
• Country of Publication: United States
• Language: English

Related Subjects

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