Research and Development of Rare Earth-Transition Metal Alloys as Permanent-Magnet Materials
Semiannual interim technical rept. 1 Jul-31 Dec 1971
DAYTON UNIV OH RESEARCH INST
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Mixed intermetallic phases of type R2Co1-xFex17 with RCe, Pr, Nd, Sm, Y, and MM Ce-rich mischmetal are being studied as potential permanent magnet materials. Except for RNd, all show ranges of x in which the crystallographic c-axis is the easy axis of magnetization. During the present period, these ranges have been more precisely defined and quantitative measurements of the saturation magnetization and crystal anisotropy constants initiated. The composition dependence of selected metallurgical and magnetic properties of phases of the type Nd1-xRxCo5, where RCe, Pr, and Y, are under investigation. Peritectic melting temperatures, lattice constants, Curie temperatures, and saturation-magnetization measurements are reported. Single crystals of several of the mixed phases have been prepared and saturation magnetization and room-temperature anisotropy measurements on these have been initiated.
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