Magnetocaloric performance of the three-component HoErNi (x = 0.25, 0.5, 0.75) Laves phases as composite refrigerants.

To date, significant efforts have been put into searching for materials with advanced magnetocaloric properties which show promise as refrigerants and permit realization of efficient cooling. The present study, by an example of HoErNi, develops the concept of magnetocaloric efficiency in the rare-earth Laves-phase compounds. Based on the magneto-thermodynamic properties, their potentiality as components of magnetocaloric composites is illustrated.

Application of a DyCoCuH Addition for Controlling the Microstructure and Magnetic Properties of Sintered Nd-Fe-B Magnets.

The focus of new technologies on the formation of inhomogeneous distributions of heavy rare-earth metals (REMs) in hard magnetic Nd-Fe-B materials is of scientific importance to increase their functional properties, along with preserving existing sources of heavy REMs. This paper focused on the coercivity enhancement of NdFeB-based magnets by optimizing the microstructure, which includes the processes of grain boundary structuring via the application of a DyCoCuH alloy added to the initial Nd-Fe-B-based powder mixtures in the course of their mechanical activation. We have studied the role of alloying elements in the formation of phase composition, microstructure, the fine structure of grains, and the hysteretic properties of hard magnetic Nd(R)FeB-based materials.