Magnetic Characteristics of 2–17 Lanthanide-Nickel Compounds

Abstract

Magnetic characteristics of nine compounds represented by the formula Ln2Ni17 (Ln=Y or a lanthanide) are reported. The Y, Sm, and Lu compounds are ferromagnetic; the others are ferrimagnetic. Curie temperatures range from 601° to 641°K. The nickel moment is 0.27 μB, which is in very close agreement with 0.25 μB, the value expected if all Ln valence electrons are transferred into the Ni 3d band. Magnetization of the Y2Ni17 and Lu2Ni17 compounds is lost in two stages as temperature is increased. Ferrimagnetism of heavy lanthanide compounds is indicated by the magnitude of their saturation moments and the form of the magnetization-temperature curves. The magnetic coupling is the same as that observed in similar and related Ln–Co and Ln–Fe compounds, i.e., the Ln–Ni coupling is antiferromagnetic and ferromagnetic for heavy and light lanthanides, respectively. From the Curie temperature it is inferred that the Ni–Ni interaction is dominant. This is in contrast with the situation in Ni-containing Laves and Haucke phases, in which the Ln–Ln interaction is dominant.

Correlation of microstructure and catalytic activity of crystalline Ni–Co–Y alloy electrode for the hydrogen evolution reaction in alkaline solution

“…The Y 2 Ni 17 show a peritectic formation at 1330 • C and crystallize in the hexagonal hP38-Th 2 Ni 17 type. Carfagna and Wallace [46] postulated a composition range for Y 2 Ni 17 , based on lattice parameter and Curie temperature measurements. This range extends on the Y-rich side, but the extent was not determined.…”

Ferromagnetism and crystal fields inYbInNi4

“…[16][17][18] Here, we present the results of a detailed study of the physical properties of single-crystal YbInNi 4 . YbInNi 4 orders ferromagnetically at low temperature, a relatively uncommon ground state for trivalent Yb compounds-only a few examples of such behavior are known: the dense Kondo compound YbNiSn, [19][20][21] Yb 2 Ni 17 , in which the Ni sublattice also orders ferromagnetically, 22,23 and YbPt 2 . 24 However, as discussed below, crystal-field effects are dominant in YbInNi 4 , making it more analogous to the antiferromagnetic compound YbBe 13 ͑Refs.…”

Predicting the Curie temperature of ferromagnets using machine learning

“…Finally, there are several transitionmetal/rare-earth intermetallic magnets for which multiple T C are reported. For instance the two values of 186 K [33] and 641 K [34] have been both reported for Sm 2 Ni 17 . Such large discrepancy has been attributed to the presence of possible secondary phases [34].…”