| Popis: |
Electrical resistivity, rho, data obtained on 4 large spinel ferrite single crystals are presented. The crystals were required for a time-of-flight neutron spectrometer; in this application, high rho values are desired to minimize eddy current losses. Primary characterization of the crystals showed that the compositions of all the crystals except Mn/sub 0/ /sub 7/Ga/sub 0/ /sub 3/Fe/sub 2/O/sub 4/ varied considerably along the growth axis, and rho measurements obtained on an Ni ferrite crystal in the present study showed that rho is quite sensitive to the composition gradient. Microhardness data were obtained to characterize the crystals further, and average values for samples from the 4 crystals varied from 570 to 875 kg/mm/sup 2/. |
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