Abstract
The intermetallic compound GdZn possesses a B2 (CsCl-type) structure and is ferromagnetic with a Curie temperature of 268 K. By hydriding, a drastic change in the magnetic as well as the structural properties occurs. The samples were charged up to a maximum concentration of 2H atoms per formula unit. The hydride GdZnH 2 was found to be paramagnetic at temperatures above 5 K and showed X-ray diffraction patterns of a CaF 2 -like structure similar to the pattern of GdH 2 . A reduction in the H concentration yielded the coexistence of two CaF 2 -like phases, one of them with a Curie temperature of 50K. For concentrations of less than one H atom per formula unit, the coexistence of a CaF 2 -like and a CsCl-type phase was found, the sample showing two Curie temperatures at about 50 and 266K. These results indicate the existence of three different phases in the system GdZn-H. These phases could be identified by their characteristic magnetic and structural properties.
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