A neutron-diffraction study of the tetragonal-monoclinic crystal structures of some uranium-thorium dicarbides

• Published in: Journal of solid state chemistry Vol. 68; no. 2; pp. 219 - 226
• Main Authors: Jones, D.W., McColm, I.J., Steadman, R., Yerkess, J.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.06.1987; Elsevier
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Hydrides, borides, nitrides, etc., and metalloidal compounds; Inorganic compounds; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Powder pattern; Actinide Compounds; Neutron diffraction; Transition metal Compounds; Chemical composition; Thorium Uranium Carbides Mixed; Experimental study; Solid solution; Inorganic compound; Crystalline structure
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/0022-4596(87)90306-9

Crystal-structure line profile refinements have been made for neutron powder diffraction data collected at room temperature from the ternary uranium-thorium dicarbide U 0.1Th 0.9C 2 and the two binary dicarbides UC 2 and ThC 2. U 0.1Th 0.9C 2 is monoclinic, with unit cell dimensionsa = 6.630(2), b = 4.183(1), c = 6.690(2)A˚, β = 103.86(1)°, isostructural with ThC 2, a = 6.684(2), b = 4.220(1), c = 6.735(2)A˚, β = 103.91(1)°. The tetragonal structure for UC 2 is confirmed, witha = 3.522(1), c = 5.988(1)A˚. U 0.1Th 0.9C 2 contains discrete C-C groups 1.297(8)A˚long; more precise values for C-C lengths have been determined for UC 2 (1.322(4)A˚) and ThC 2 (1.304(6)A˚).