Abstract
Experimental data on the structure, magnetization and heat capacity of polycrystalline Tb 1− x La x Ni 2 samples are represented. The X-ray diffraction performed at room temperature allowed us to reveal that the Tb 1− x La x Ni 2 solid solutions solidify with the formation of a Laves-phase superstructure corresponding to the F 4 ¯ 3 m space group; no Laves-phase structure is formed. Magnetic measurements showed that the samples with x ≤ 0.8 are ferromagnets with relatively low (below 36 K) Curie temperatures T C. Their Curie temperatures decrease from 36 K for TbNi 2 to 8 K for Tb 0.2La 0.8Ni 2. The samples of Tb 0.1La 0.9Ni 2 and LaNi 2 have no any long-range magnetic order in measurements temperature range, though the heat capacity measurements suggest a critical La content 90% and T C = 3 K. At high temperatures, all solid solutions are Curie–Weiss paramagnets. The heat capacity measurements have been performed for solid solutions Tb 1− x La x Ni 2 with x ≤ 0.5 and allowed us to determine the Debye temperature. The magnetocaloric effect was estimated from measurements performed in two magnetic field, 0.42 and 4.2 T.
Published Version
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