Potassium Disorder in the Defect Pyrochlore KSbTeO6: A Neutron Diffraction Study
Instituto de Ciencia de Materiales de Madrid Consejo Superior de Investigaciones Científicas., Cantoblanco, E-28049 Madrid, Spain
Nanotech (Centro de Investigación en Nanociencia y Nanotecnología), Universidad Tecnológica Nacional-Facultad Regional Córdoba, 5016 Córdoba, Argentina
Institut de Ciència de Materials de Barcelona, Consejo Superior de Investigaciones Científicas, Bellaterra, E-08193 Barcelona, Spain
ALBA Synchrotron, Cerdanyola del Vallès, E-08290 Barcelona, Spain
Institut Laue Langevin, BP 156X, F-38042 Grenoble, France
Author to whom correspondence should be addressed.
Academic Editors: Helmut Cölfen and Silvina Pagola
Received: 25 November 2016 / Revised: 13 December 2016 / Accepted: 26 December 2016 / Published: 13 January 2017
defect pyrochlore has been prepared from K2
, and 15% excess TeO2
by solid-state reaction at 850 °C. Direct methods implemented in the software EXPO2013 allowed establishing the basic structural framework. This was followed by a combined Rietveld refinement from X-ray powder diffraction (XRD) and neutron powder diffraction (NPD) data, which unveiled additional structural features. KSbTeO6
is cubic, a
= 10.1226(7) Å, space group
, Z = 8 and it is made of a mainly covalent framework of corner-sharing (Sb,Te)O6
octahedra, with weakly bonded K+
ions located within large cages. The large K-O distances, 3.05(3)–3.07(3) Å, and quite large anisotropic atomic displacement parameters account for the easiness of K+
exchange for other cations of technological importance.
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Alonso, J.A.; Mayer, S.; Falcón, H.; Turrillas, X.; Fernández-Díaz, M.T. Potassium Disorder in the Defect Pyrochlore KSbTeO6: A Neutron Diffraction Study. Crystals 2017, 7, 24.
Alonso JA, Mayer S, Falcón H, Turrillas X, Fernández-Díaz MT. Potassium Disorder in the Defect Pyrochlore KSbTeO6: A Neutron Diffraction Study. Crystals. 2017; 7(1):24.
Alonso, José A.; Mayer, Sergio; Falcón, Horacio; Turrillas, Xabier; Fernández-Díaz, María T. 2017. "Potassium Disorder in the Defect Pyrochlore KSbTeO6: A Neutron Diffraction Study." Crystals 7, no. 1: 24.
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