The title ternary compounds have been thoroughly studied by X-ray diffraction, both on powders and single crystals. The already reported GdScGe does not form exactly at the equiatomic composition but with a stoichiometry slightly richer in Gd: Gd1.02Sc0.98Ge; it crystallizes with the tetragonal CeScSi-type (ordered La2Sb-type, space group I4/mmm) with a = 4.261(1) and c = 15.593(5) Å. Gd2.38Sc2.62Ge3 is hexagonal, Mn5Si3-type (space group P63/mcm), with cell parameters a = 8.276(5) and c = 6.116(6) Å. Magnetic measurements show that Gd1.02Sc0.98Ge undergoes a ferromagnetic transition at Tc = 350 K, whilst no evidence of long range magnetic ordering has been detected for Gd2.38Sc2.62Ge3 from 1.5 to 60 K, as deduced by preliminary heat capacity data. © 2002 Elsevier Science B.V. All rights reserved.
Single crystal study of the high-Curie-temperature ferromagnet Gd1.02Sc0.98Ge and of Gd2.38Sc2.62Ge3
MANFRINETTI, PIETRO;PANI, MARCELLA;PALENZONA, ANDREA;
2002-01-01
Abstract
The title ternary compounds have been thoroughly studied by X-ray diffraction, both on powders and single crystals. The already reported GdScGe does not form exactly at the equiatomic composition but with a stoichiometry slightly richer in Gd: Gd1.02Sc0.98Ge; it crystallizes with the tetragonal CeScSi-type (ordered La2Sb-type, space group I4/mmm) with a = 4.261(1) and c = 15.593(5) Å. Gd2.38Sc2.62Ge3 is hexagonal, Mn5Si3-type (space group P63/mcm), with cell parameters a = 8.276(5) and c = 6.116(6) Å. Magnetic measurements show that Gd1.02Sc0.98Ge undergoes a ferromagnetic transition at Tc = 350 K, whilst no evidence of long range magnetic ordering has been detected for Gd2.38Sc2.62Ge3 from 1.5 to 60 K, as deduced by preliminary heat capacity data. © 2002 Elsevier Science B.V. All rights reserved.
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