The method of electron diffraction in powders revealed that in the alloy Pr- 77 at. % Fe after annealing for 10 h at 800°С two intermetallides are formed, Pr2Fe1т and PrFe2, in two Laves phase modifications, С14 and С15. It was shown that the PrFe2 С14 structure in powder grains is unstaЫe with respect to electron itradiation in the tube of an electron microscope, which results in а radiation-induced phase transition of the PrFe2 С14 intermetallide with а hexagonal lattice into an fcc structure with the space group FmЗm and the parameter а= 9.lA.
Departmeпt of Solid-State Physics
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