Crystal and Magnetic Structure of New Ternary Uranium Intermetallics: U3TiX5(X=Ge, Sn)

New compounds with the formula U3TiX5have been synthesized forX=Ge, Sn. The crystal structure of U3TiGe5has been refined from single crystal X-ray diffraction data toR(F)=0.032,Rw=0.037, and was found to crystallize with the hexagonal U3TiSb5structure type, witha=8.495(1) Å andc=5.711(1) Å. Isotypis...

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Veröffentlicht in:	Journal of solid state chemistry 1999-05, Vol.144 (2), p.311-317
Hauptverfasser:	Boulet, P., Gross, G.M., André, G., Bourée, F., Noël, H.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Exact sciences and technology Hydrides, borides, nitrides, etc., and metalloidal compounds Inorganic compounds Magnetic properties and materials Magnetically ordered materials: other intrinsic properties Physics Saturation moments and magnetic susceptibilities Structure of solids and liquids crystallography Structure of specific crystalline solids uranium compounds, crystal structure, magnetic structure
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Zusammenfassung:	New compounds with the formula U3TiX5have been synthesized forX=Ge, Sn. The crystal structure of U3TiGe5has been refined from single crystal X-ray diffraction data toR(F)=0.032,Rw=0.037, and was found to crystallize with the hexagonal U3TiSb5structure type, witha=8.495(1) Å andc=5.711(1) Å. Isotypism was found from X-ray powder diffraction analysis for the stannide U3TiSn5, witha=9.200(2) Å andc=6.128(3) Å. Magnetic susceptibility measurements carried out on polycrystalline powder samples reveal ferromagnetic type ordering atTC=76 and 65 K for U3TiGe5and U3TiSn5, respectively. Neutron powder diffraction studies of U3TiGe5show that the uranium magnetic moments have two components: a ferromagnetic component (MF=0.9μBat 1.4 K) along thecaxis and a triangular component (MT=0.4μBat 1.4 K) in the hexagonal plane antiferromagnetically ordered along thecaxis.
ISSN:	0022-4596 1095-726X
DOI:	10.1006/jssc.1999.8149