Abstract
Two new isostructural mixed-valent tellurium oxides, CsTeMoO6 (1) and RbTe1.25Mo0.75O6 (2), have been synthesized by solid-state reactions and characterized by single-crystal X-ray diffraction and thermal analysis. Both compounds have pyrochlore-type structure with cubic space group Fd3¯m, Z = 8 and the following unit cell parameters: a = 10.5892(5) Å in CsTeMoO6 and a = 10.4421(2) Å in RbTe1.25Mo0.75O6. A small part of the oxygen atoms shifts from the special position 48f to the general crystallographic position 192i, because the Te4+ ion is too large for the regular pyrochlore-structure framework and causes local distortions. The thermal instability of the CsTeMoO6 and RbTe1.25Mo0.75O6 phases was found at the 449–521 °С and 381–466 °С temperatures ranges, respectively.
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