Magnetic Moments of Intermetallic Compounds of Transition and Rare-Earth Elements

Abstract

The effect of adding the rare-earth elements to cobalt, iron, and nickel has been investigated. Antiferromagnetic coupling was found to exist in the cobalt and iron rare-earth compounds. The moment per formula unit of the compound Co5Y is increased when Sm, Pr, and Nd are substituted for yttrium and decreased when Tm, Gd, Tb, Er, Dy, and Ho are substituted. This is explained on the basis that although the spin moments of cobalt and rare earths are coupled antiferromagnetically in these compounds, the orbital moments add to the cobalt moment in the compounds containing Sm, Pr, and Nd, but they subtract from the cobalt moment in the compounds containing Tm, Tb, Er, Dy, and Ho. For the iron compounds investigated, the moment of the compound Fe4Y was found only to decrease when Tm, Er, Ho, and Dy were substituted for yttrium. The nickel compounds behaved entirely differently from the cobalt and iron compounds since very little or no antiferromagnetic coupling was observed in these compounds.

Thermodynamic assessment of the Ce–Ni system

“…The heat capacity of CeNi 2 and CeNi 5 at 0-300 K was reported by Marzouk et al [7] and Wallace [8]. Based on these works [7][8][9][10][11][12][13][14][15][16][17][18][19][20], the Ce-Ni system was reviewed by Nash and Tung [21]. They stated that some uncertainties in the Ce-Ni system should be resolved.…”

“…The magnetic contribution to the Gibbs energy mg G Ce m Ni n m is included in the Gibbs energy G Ce m Ni n m , because these intermetallic compounds are nonmagnetic and the critical temperatures of magnetic transformation are much below 298.15 K [8][9][10][11].…”

The Influence of Yb Substitution on the Magnetic, Electric Properties and Electronic Structure οf YbxGd1-xNi5System

“…The analysis of its magnetic properties shows that the Curie temperatures are very low. The highest value of T C was evidenced for GdNi 5 compound [1][2][3][4] which was obtained for the first time in 1962 by Nesbitt et al [6]. Latter studies showed that GdNi 5 is the ferrimagnet below T C = 32 K and the value of magnetization extrapolated to 0 K equals 6.2 µ B /f.u.…”

“…The RT 5 compounds, where R is rare earth and T is a transition metal, show very interesting magnetic properties due to the combination of 3d itinerant and 4f localized magnetism [1][2][3][4][5][6][7][8][9][10][11]. One of the most known series is RNi 5 .…”

The Electronic and Magnetic Properties οf YbxGd1-xNi5Systems

“…The RNi 5 compounds (R = rare earth) have been intensively studied in recent decades [1][2][3][4][5][6][7][8][9][10][11][12]. Newly obtained series of the Yb x Gd 1−x Ni 5 compounds (x ≤ 0.5) exhibit interesting properties [5].…”