Magnetic and crystallographic properties of novel Fe-rich rare-earth nitrides of the type RTiFe11N1−δ (invited)

Abstract

We succeed in inserting a number of nitrogen atoms into the RTiFe11 intermetallics. The nitrides retain the ThMn12-type structure, but with an increase in the unit cell volume. The crystallographic sites located by nitrogen atoms are determined by using neutron diffraction techniques. The nitrogen atoms are found to have an effect of increasing Curie temperature and saturation magnetization. Moreover, an essential change in magnetocrystalline anisotropy is observed upon nitrogenation. By all of these effects, the NdTiFe11N1−δ compounds have excellent intrinsic magnetic properties favorable for permanent magnet applications.

First-principles study on stability and magnetism of NdFe11M and NdFe11MN for M = Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn

“…The total magnetic moments of NdFe 11 Co and their nitrogenated compounds have almost the same values as those of NdFe 12 and its nitrogenated compound, and have much larger values than those of NdFe 11 Ti(8i), which are previously studied in theories and experiments. 1,2,11,12,32 Next the values of r …”

“…Using first-principles method, we study the effect of substitutional 3d transition metal elements to the mother compound NdFe 12 . We find that Co has positive effect on the stability of the ThMn 12 structure.…”

Structure and magnetic properties of TbFe10.5−x MnxMo1.5 compounds

“…This phase can be stabilized by replacing some of the iron atoms with a small amount of other elements such as Ti, V, Mn, Co, Mo, Nb, Si, and Al, etc., and the RFe 12−x M x metallic compounds can be obtained. Some of the compounds of the type RFe 12−x M x are characterized by fairly high values of the Curie temperature, saturation magnetization and magnetocrystalline anisotropy [1][2][3][4]. So the iron-rich rare earth transition-metal compounds become new potential candidates for permanent magnet applications, and the study of these compounds is attracted intensively worldwide.…”

Electronic and Magnetic Properties of Y(FeV)12Compound and its Carbides

“…PACS numbers: 75.50.Bb, 75.10.Lp It has been reported that the magnetic properties of iron-rich rare-earth intermetallic compounds with ThMn12 structure can be drastically changed upon nitrogenation or carbonation by gas-solid reaction which introduce carbon into the interstitial 2(b)-(0, 0, 2) site [1,2].…”

“…In spite of carbides' unit volume decrease enhancement of magnetization and Curie temperature were obtained. Results are in quantitative agreement with experimental data.PACS numbers: 75.50.Bb, 75.10.Lp It has been reported that the magnetic properties of iron-rich rare-earth intermetallic compounds with ThMn12 structure can be drastically changed upon nitrogenation or carbonation by gas-solid reaction which introduce carbon into the interstitial 2(b)-(0, 0, 2) site [1,2].Recently it has been shown that some amount of carbon can be introduced into 1:12 intermetallics by arc-melting method, and the results of crystallographic and magnetic investigations of these compounds indicated that the effect of carbonation can be different from that observed in samples prepared by gas-solid method. The unit volume is observed to reduce slightly upon carbonation, and despite the unit volume reduction, saturation magnetization and Curie temperature increase significantly [3,4].…”