63 research outputs found
Ternary RPt4B (R=La, Ce, Pr, Nd) compounds. structural and physical characterization
No full textThe compounds RPt4B, with (R = La, Ce, Pr, Nd), were synthesized and their crystal structure was studied either by single crystal X-ray diffraction and/or by conventional and synchrotron X-ray powder diffraction. All four compounds of this family are isostructural and belong to the CeCo4B structure type. AC-susceptibility and magnetization studies show that: there is no magnetic ordering of the La compound down to 1.7 K; the Ce compound presents an antiferromagnetic-type-transition at 2.4 K; and both Pr and Nd compounds present a ferromagnetic-type transition at 4.2 and 4.9 K, respectively. Electrical resistivity studies show metallic behaviour for all compounds, the temperature dependence for the La compound being described by the Bloch Gruneisen relation. Thermopower studies as a function of temperature show that the thermopower is positive and small for these compounds, which is consistent with hole dominated metallic behaviour
Magnetic Phase Diagram Of U(ga1-xcux)2
No full textMagnetization results for the polycrystalline pseudobinary compounds U(Ga1-xCux)2 for x ≤ 0.28 are reported. The lattice parameters and unit cell volume remain essentially constant for x ≤ 0.15 where the ferromagnetic phase can be found. As the Cu content increases up to 28%, the lattice parameter a increases while the parameter c decreases and the unit cell volume is reduced. The magnetization for all concentrations depends on the sample history (ZFC and FC). The ferromagnetic transition shifts from 125 K for UGa2 to about 50 K for x = 0.15. At 20% there is indication of coexistence of spin-glass and ferromagnetic phases and at 28% only the spin-glass phase is observed. © 2001 Elsevier Science B.V. All rights reserved.226-230PART II13121314Andreev, A., Belov, K., Deryagin, A., Kazei, Z., Levitin, R., Menovsky, A., Popov, Yu., Silantev, V., (1978) Sov. Phys. JETP, 48, p. 1187Sechovsky, V., Havela, L., Svoboda, P., Andreev, A., (1986) J. Less Comm. Metals, 121, p. 163Shlyk, L., Stepien-Damm, J., (1999) J.M.M.M., 11, p. 3525Kolomiets, A., Havela, L., Sechovsky, V., Javorsky, P., Kamarad, J., Sato, N., Cuong, T., (1999) Physica B, 259-261, p. 238Childress, J., Chien, C., (1991) Phys. Rev. B, 43, p. 808
ChemInform Abstract: Crystal Structure of LnCuPb (Ln: Y, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu) Compounds.
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