Rare earth nitrides

Nitrogen combines with numerous elements of the Periodic Table less electronegative than itself, to give rise to nitrides rare-earth metals (R) do not disobey this assertion the stable RN binary solids formed are characterized, in particular, by high melting points, around 2500°C. 

Although there are several hundred biaary nitrides, only a relative few ternary bimetallic metal nitrides are known (6). A group of ternaries of the composition where M is an alkah, alkaline-earth, or a rare-earth metal and M is a transition or post-transition metal, have been synthesized (6). 

The rare-earth nitrides do not have any technical appHcations. These are high melting compounds but are hydrolyzed easily by moisture and are not stable under normal atmospheric conditions. 

Binary rare-earth compounds such as carbides, sulfides, nitrides, and hydrides have been used to prepare anhydrous trihalides, but they offer no special advantage. Treating these compounds at a high temperature with a halogen (98) or hydrogen halide (115) produces the trihalide, e.g.,... 

Gschneidner, K, A, Jr, Kippenhan, N, "Thermochemistry of the Rare Earth Carbides, Nitrides and Sulfides for Steelraaking", IS-RIC-5 Rare Earth Information Center, Iowa State Univ., Ames, lA, 1971. 

Fig. 13. Lattice parameters of the actinide and rare earth nitrides and arsenides. Full circles and triangles represent experimental values open circles and triangles, the theoretical values, for actinides and rare earths (from )...

Paramagnetism results from unpaired electrons. As a result, most compounds containing transition, rare-earth, and actinide elements, including oxides, nitrides, carbides, and borides, exhibit paramagnetism. Such ceramics are generally not of importance due to their paramagnetism alone, since they often exhibit other types of magnetism, as well. 

Fig. 12. Tetragonal rare-earth nickel borocarbides (nitrides) with (a) single, (b) double and (c) triple t C(N)-Layers and values of the superconducting transition temperature Tc (Cava et al. 1994c Gao et al. 1994 ...

Alleno, E P. Berger, E. Leroy and C. Godart, 2001, in Rare Earth Transition Metal Borocarbides (Nitrides) Superconducting, Magnetic and Normal State Properties, eds K.-H. Muller and V.N. Narozh-nyi (Kluwer Acad. Publ., Dordrecht) p. 265. 

Cava, R.J., 2001, in Rare Earth Transition Metal Borocarbides (Nitrides) Superconducting, Magnetic and... 

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