Magnetic properties of Ho1−xMmxCo2 (x=0, 0.1, 0.2, 0.3 and 0.4) alloys and their hydrides

Magnetic behaviour of hydrogenated Ho1−xMmxCo2 (x=0–0.4) alloys

“…to form stable hydrides. The absorbed hydrogen very often leads to strong changes in the physical property behaviour of alloys [3][4][5]8,16,17]. In the RCo 2 series, most of the recent works have been focussed on the substitution of a rare-earth metal for one of the other magnetic lanthanides, in which the R atomic site mostly consisting of the mixture of light rare earths (LR = La, Ce, Pr, Nd, and Sm) and heavy rare earths (HR = Gd, Tb, Dy, Ho, and Er) [4,9,11,12,15].…”

“…It is reported that the magnetic behaviour of HR 1−x LR x Co 2 is strongly influenced by the amount and nature of the R's. Very recently we have reported the hydrogen absorption-desorption, structure and transport properties of Mm substituted HoCo 2 , Ho 1−x Mm x Co 2 (x = 0, 0.1, 0.2, 0.3, and 0.4; Mm = mischmetal) alloys and their hydrides [4,[16][17][18]. Mischmetal is a cheap natural ore and contains the light rare earth metals: 50% Ce, 35% La, 8% Pr, 5% Nd, 1.5% other rare earth elements and 0.5% Fe.…”

Magnetic behaviour in Dy1 −xMmxCo2compounds

“…Mm mostly consists of Ce and La with small amounts of Nd, Pr or Sm depending on the place of origin. Earlier, the structure and magnetic transitions of R 1−x Mm x Co 2 (R = Ho, Dy; Mm = Indian mischmetal, which consists of 50 wt% Ce, 35 wt% La, 8 wt% Pr, 5 wt% Nd and 1.5 wt% of other rare earth elements and 0.5 wt% Fe) compounds have been studied using powder x-ray diffraction, and temperature dependence of electrical resistivity, ac susceptibility and thermopower [15][16][17]. The Mm substitution is known to decrease the T C , however there is no idea on the magnetization behaviour, induced Co moments and the nature of the magnetic transition-whether it is of first-order or secondorder.…”