Structure and Magnetic Properties of Intermetallic Rare-Earth-Transition-Metal Compounds: A Review

Abstract

This review discusses the properties of candidate compounds for semi-hard and hard magnetic applications. Their general formula is R1−sT5+2s with R = rare earth, T = transition metal and 0≤s≤0.5 and among them, the focus will be on the ThMn12- and Th2Zn17-type structures. Not only will the influence of the structure on the magnetic properties be shown, but also the influence of various R and T elements on the intrinsic magnetic properties will be discussed (R = Y, Pr, Nd, Sm, Gd, … and T = Fe, Co, Si, Al, Ga, Mo, Zr, Cr, Ti, V, …). The influence of the microstructure on the extrinsic magnetic properties of these R–T based intermetallic nanomaterials, prepared by high energy ball milling followed by short annealing, will be also be shown. In addition, the electronic structure studied by DFT will be presented and compared to the results of experimental magnetic measurements as well as the hyperfine parameter determined by Mössbauer spectrometry.

Increase in Recovery Efficiency of Iron-Containing Components from Ash and Slag Material (Coal Combustion Waste) by Magnetic Separation

“…The obtained results showed that the distribution of iron is quite equal in all fraction but microspheres, which include high-magnetic iron minerals associated with intermeta lics, are mainly concentrated in the magnetic fractions obtained at current values of 2, and 4 A (0.25, 0.345, and 0.422 Tesla, respectively). It can be supposed that iron in th compounds has different valence forms and different magnetic properties [44]. At th same time, particles containing low-magnetic iron and aluminum were not found in th separated magnetic fractions.…”

New Insights on the Electronic-Structural Interplay in LaPdSb and CePdSb Intermetallic Compounds

“…An important aspect characterizing the ferromagnetic materials is the Curie temperature, which varies drastically between classes of materials or even for materials within the same class, depending on the microscopic ingredients giving rise to the ferromagnetic ground state. Intermetallic compounds based on transition metals have a larger Curie temperature, while those based only on rare-earth have smaller ordering temperatures [ 70 , 71 , 72 , 73 , 74 ]. CePdSb itself has a small Curie temperature compared with the requirements for practical applications, but it has one of the largest ordering temperatures of its class.…”

Magnetocaloric properties in (La,R)(Fe,Mn,Si)13H (R = Ce and Pr)—toward a better alloy design that results in a reduction in volume of permanent magnets and the establishment of long-term reliability in cooling systems

“…In particular, the low-field response was improved by simply adjusting the Fe concentration using conventional metallurgical approach [21]. In addition, as a similar approach for improvement of an Fe-rare earth permanent magnets [28,29], an increase in the neighboring Fe-Fe distance by interstitial hydrogen absorption stabilizes the FM state, realizing a transition at temperatures higher than room temperature [30,31]. Meanwhile, the proposed compound system has a shortcoming of the splitting phenomenon, which is correlated with the diffusion of hydrogens [24,25,[32][33][34].…”