Chiolite-like Ca5Te3O14: An X-ray and neutron diffraction study

✍ Scribed by W.T. Fu; D.J.W. IJdo

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 415 KB
• Volume: 181
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2008.02.033

✦ Synopsis

The crystal structure of Ca 5 Te 3 O 14 at room temperature was studied by the Rietveld method using combined X-ray and neutron powder diffraction data. The compound crystallizes in the space group Cmca with the lattice parameters a ¼ 10.4268(2) A ˚, b ¼ 10.3908(2) A ˚and c ¼ 10.4702(2) A ˚. The structure of Ca 5 Te 3 O 14 is chiolite-like and consists of a framework of corner-linked TeO 6 octahedral layers in which a linear TeO 2 group of every fourth octahedron is substituted by a Ca atom. This type of structure was previously observed in BaSr 4 U 3 O 14 . The relationship between the chiolite-like structure and the fluorite structure is discussed.