Abstract
A novel mixed valent tellurium oxide, SrTe 3O 8, has been synthesized and its crystal structure was determined ab initio from powder X-ray diffraction data. This oxide, which crystallizes in a tetragonal unit-cell, P4 2/ m space group, with very close a and c cell parameters (6.8257(1) and 6.7603(1) Å, respectively), exhibits a very original structure built up of corner-sharing TeO 6 (Te 6+) octahedra and Te 2O 8 (Te 4+) twin-pyramidal units. The latter ones form [Te 3O 8] ∞ chains running along the [001] and the [110] directions. Besides the four sided tunnels where the Sr 2+ cations are located, there are very large four sided tunnels running along the c-axis which are obstructed by the electronic lone pairs of the Te 4+ cations.
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