The Structure of BaSr4U3O14 and a Structural and Thermodynamic Characterization of Sr5U3O14

✍ Scribed by E.H.P. Cordfunke; M.E. Huntelaar; D.J.W. IJdo

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 252 KB
• Volume: 146
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8320

✦ Synopsis

The structures of Sr 5 U 3 O 14 and BaSr 4 U 3 O 14 have been studied by X-ray powder di4raction and neutron powder di4raction. Both compounds could be indexed on a pseudo-tetragonal, chiolitetype structure. Sr 5 U 3 O 14 was shown to be orthorhombic and to have space group Pbca with a‫)7(6142.11؍‬ A > , b‫)7(2752.11؍‬ A > , c‫)4(1970.11؍‬ A > , and Z‫.4؍‬ BaSr 4 U 3 O 14 was shown to be orthorhombic and to have space group Cmca with a‫)7(7463.11؍‬ A > , b‫)7(0773.11؍‬ A > , c‫)5(3020.11؍‬ A > , and Z‫.4؍‬ The thermodynamic properties of Sr 5 U 3 O 14 at 298.15 K have been determined, and its thermal stability with respect to the neighboring strontium uranate phases are discussed.