Physics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pepi...22..144p&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 22, Issue 2, p. 144-154.
Physics
9
Scientific paper
Some of the magnetic properties of dispersions of immobilized multidomain magnetite particles are determined by intrinsic crystalline properties but others are strongly affected by the state of division and the particle shape. Various theories of magnetization have included shape effects but the experimental evidence is meagre, due principally to the great difficulty in determining precisely the amount of magnetite. A series of measurements have been made on dispersions of particles which appear to be pure magnetite with only a non-magnetic gangue-mineral impurity. The specimens used contained low concentrations of magnetite - so the specimen shape was unimportant - and either restricted particle sizes or bimodal size-distributions. The results are not in agreement with either the previously proposed value of the shape factor nor with the properties of mixed particle-sizes.
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