Crystal structure and physical properties of UMo3B7. (June 2017)

• Record Type: Journal Article
• Authors: Salamakha, L.; Sologub, O.; Rizzoli, C.; Michor, H.; Gonҫalves, A.P.; Rogl, P.; Bauer, E.
• Is Part Of: Intermetallics. Volume 85(2017)
• Page Start: 180
• Page End: 186
• Publication Date: 2017-06
• Subjects: Uranium molybdenum boride -- Crystal chemistry -- Electrical resistivity -- Magnetic susceptibility -- Specific heat -- X-ray diffraction; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2017.02.009
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: A novel ternary compound, UMo3 B7, has been synthesized by arc melting and annealing at 900 °C. Its crystal structure was determined from X-ray single crystal diffraction data (YMo3 B7 -type structure, space group Pnma ; a = 1.10310(8) nm, b = 0.30995(2) nm, c = 1.2792(1) nm, RF 2 = 0.0205). The structure is composed of boron filled trigonal prisms as well as unfilled tetrahedra and tetragonal pyramids formed by metal atoms. With respect to boron atoms aggregation, it exhibits a well-developed two-dimensional boron network revealing infinite bands of edge linked boron hexagons. The relationship with the members of the structural series within the V-B system: Vn Bn+1 = (n-1)VB (CrB-type) + VB2 (AlB2 -type) (n = 1, 2, 3, 5) is discussed. Specific heat, magnetic susceptibility and electrical resistivity measurements characterize UMo3 B7 as a spin fluctuating system. Highlights: New uranium molybdenum boride of YMo3 B7 -type structure has been synthesized. Boron substructure in UMo3 B7 is composed of infinite bands of edge linked B6 hexagons. Structural relationships of UMo3 B7 with AlB2 and CrB structures have been clarified. UMo3 B7 is a spin fluctuating system according to physical properties measurements data.