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.
This is an open access article distributed under the Creative Commons Attribution License
which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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MDPI and ACS Style
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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