5/18/2023 0 Comments Ufe3![]() Results on this ternary diagram were previously reported by Valyovka and Kuzma, , who identified UFe 3B 2 and UFeB 4. In the course of our line of research on new intermetallic compounds with unusual physical properties, our attention has been drawn to the U–Fe–B system. However, recent single crystal X-ray diffraction studies indicate that UNi 4B crystallizes in the orthorhombic Cmcm space group, with four distinct uranium positions, which most probably determines its peculiar magnetic structure. ![]() UNi 4B was first reported as crystallizing with the hexagonal CeCo 4B-type structure and to order antiferromagnetically below T N=20 K. This weakens the 5f(U)–4d(Rh) hybridization, most probably due to formation of B–Rh bonds, leading to an antiferromagnetic state below T N=9.5 K for URh 3B. ![]() URh 3B x is based on the cubic URh 3 compound, in which up to x=1 boron atoms tend to occupy the interstitial position at the center of the unit cell. In general, these compounds do not show magnetic ordering, the only reported exceptions being URh 3B x ( x∼1) and UNi 4B. The structure and properties of ternary uranium borides have been specifically reviewed in the early 1990s. As an example, the ternary systems R–Rh–B (R=f-element) have been extensively studied in connection with (i) the interplay between superconductivity and ferromagnetism observed for ErRh 4B 4 and (ii) the unusual magnetic properties presented by RRh 3B 2 (R=La–Gd). Ternary borides containing f-elements attract considerable interest due to their particular crystallography and physical properties.
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