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CsTe2O6-x: Novel Mixed-Valence Tellurium Oxides with Framework-Deficient Pyrochlore-Related Structure



Theeranun Siritanon, Jun Li, Judith K. Stalick, Robin T. Macaluso, Arthur W. Sleight, M. A. Subramanian


Structures of CsTe2O6-x phases were investigated by single crystal X-ray diffraction and neutron powder diffraction. Stoichiometric CsTe2O6 is a mixed-valence Cs2Te4+Te36+O12 compound with a rhombohedral pyrochlore-type structure where there is complete order of the Te4+ and Te6+. On heating, this compound develops significant electrical conductivity. As CsTe2O6 becomes oxygen deficient at 600 °C, the rhombohedral pyrochlore-type structure is replaced by a cubic pyrochlore-type structure with disordered Te4+/Te6+ and oxygen vacancies. However for CsTe2O6-x phases prepared at 500 °C, the observed pyrochlore-type structure has orthorhombic symmetry. The Te4+ and O vacancies are all on chains running along the b axis, and the maximum value of x observed is about 0.3. At still higher values of x a new compound was discovered with a structure related to that reported for Rb4Te6+5O^d23.
Inorganic Chemistry


Oxides, Pyrochlore, Defect, Non-stoichiometry, Crystal structure


Siritanon, T. , Li, J. , Stalick, J. , Macaluso, R. , Sleight, A. and Subramanian, M. (2011), CsTe<sub>2</sub>O<sub>6-x</sub>: Novel Mixed-Valence Tellurium Oxides with Framework-Deficient Pyrochlore-Related Structure, Inorganic Chemistry, [online], (Accessed May 17, 2024)


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Created July 26, 2011, Updated October 12, 2021