Abstract
Various Pr–Gd alloys, covering the whole range of compositions, have been studied by x-ray diffraction and static magnetic measurements. The magnetization measurements were made in fields extending to 26 KOe in the temperature range 2°–500°K. For the Pr–Gd system, we find the following phase diagram with the corresponding magnetic properties: (1) a Pr-rich phase of double hexagonal structure which is paramagnetic down to 2°K and which follows the Curie-Weiss Law; (2) A Gd-rich phase of compact hexagonal structure which is ferromagnetic at low temperature; and (3) A phase based on the composition Pr2Gd5 of super hexagonal structure (analogous to the structure of Sm) which is antiferromagnetic at low temperature. Two alloys having compositions just either side of this superhexagonal phase were studied. Their crystallographic structures could not be determined with precision. Their magnetic behavior corresponds to that observed in ferrimagnets. The ferromagnetic Curie temperatures of these alloys are higher than those observed in Gd93Pr7, situated in the Gd-rich phase.
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