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Specific Heat of the Tb_{1-x}La_xNi_2 Solid Solutions

100%
Ćwik J., Palewski T., Nenkov K.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
343-346
EN
Specific heat measurements have been performed on the polycrystalline TbNi_2, LaNi_2 and their solid solutions Tb_{1-x}La_xNi_2 (x=0.2, 0.3). The Debye temperatures, phonon and conduction electron contributions as well as the magnetic part of the heat capacity were determined and discussed. The magnetocaloric effect was estimated from measurements performed in a magnetic field of 0.42 T for TbNi_2, Tb_{0.8}La_{0.2}Ni_2 and Tb_{0.7}La_{0.3}Ni_2.
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Magnetic Properties and Specific Heat of Laves Phase Tb_{1-x}Sc_{x}Ni_2 (x = 0.1, 0.2) Solid Solutions

76%
Ćwik J., Palewski T., Nenkov K., Lyubina J., Warchulska J., Gutfleisch O., Klamut J.
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issue 5
877-878
EN
Magnetic and specific heat measurements have been performed on polycrystalline TbNi_2, ScNi_2 and their solid solutions Tb_{1-x}Sc_{x}Ni_2 (x = 0.1, 0.2). These compounds were synthesized using high-purity rare-earth metals. It has been found that the magnetic susceptibility of the nonmagnetic ScNi_2 compound exhibits a very weak temperature dependence characteristic of the Pauli paramagnets. TbNi_2, Tb_{0.9}Sc_{0.1}Ni_2 and Tb_{0.8}Sc_{0.2}Ni_2 are typical Curie-Weiss paramagnets and are ferromagnetically ordered below 36 K. As revealed by room-temperature X-ray powder diffraction all the Tb_{1-x}Sc_{x}Ni_2 solid solutions have the cubic Laves C15-type superstructure. The Debye temperature, phonon and conduction electron contributions as well as the magnetic part of heat capacity were determined. The magnetocaloric effect has been studied by means of specific heat measurements in magnetic fields of 0.42 and 1 T. The effect of rare-earth substitution in ScNi_2 on the magnetic and magnetocaloric properties will be discussed.
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