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Single crystals of dicalcium octa-oxidotritellurate(IV), Ca 2 Te 3 O 8 , were obtained from a CsCl/NaCl melt with CaO and TeO 2 as educts in the molar ratio of 1:2. Ca 2 Te 3 O 8 crystallizes isotypically with Pb 3 Te 2 O 8 and is comprised of two unique Ca, four Te and eight O sites. One calcium cation has eight and the other nine coordination partners. Both coordination polyhedra are considerably distorted. Two kinds of oxotellurate(IV) anions with the same formula [Te 3 O 8 ] 4- are present. One is an infinite zigzag chain anion consisting of pairs of [TeO 4 ] bis-phenoids linked to a trigonal-pyramidal [TeO 3 ] group with a connectivity of [(TeO 1/1 O 2/2 )(TeO 2/1 O 2/2 ) 2 ]  n  , while the other is a finite anion made up of one central [TeO 4 ] bis-phenoid linked to two [TeO 3 ] trigonal pyramids and has a connectivity of [(TeO 2/1 O 1/2 ) 2 (TeO 2/2 O 2/1 )]. In the crystal, the anions are organized in layers extending parallel to (100). Adjacent layers are held together by the calcium cations to define a three-dimensional framework structure.

Ca2Te3O8, a new phase in the CaO–TeO2system

Ca₂Te₃O₈, a new phase in the CaO–TeO₂system