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

Published

July 27, 2011

Author(s)

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

Abstract

Structures of CsTe₂O_6-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 CsTe₂O_6-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.

Citation

Inorganic Chemistry

Volume

50

Issue

17

Pub Type

Journals

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Keywords

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

Citation

Siritanon, T. , Li, J. , Stalick, J. , Macaluso, R. , Sleight, A. and Subramanian, M. (2011), CsTe₂O_6-x: Novel Mixed-Valence Tellurium Oxides with Framework-Deficient Pyrochlore-Related Structure, Inorganic Chemistry, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=908557 (Accessed December 7, 2024)