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The group 5 mixed-metal telluride, Hf 0.78 Ti 0.22 Te 5  (hafnium titanium penta­telluride), is isostructural with the binary phases HfTe 5  and ZrTe 5  and forms a layered structure extending parallel to (010). The layers are made up from chains of bicapped metal-centered trigonal prisms and zigzag Te chains. The metal site (site symmetry  m 2 m ) is occupied by statistically disordered Hf [78.1 (5)%] and Ti [21.9 (5)%]. In addition to the regular Te—Te pair [2.7448 (13) Å] forming the short base of the equilateral triangle of the trigonal prism, an inter­mediate Te⋯Te separation [2.9129 (9) Å] is also found. The classical charge balance of the compound can be described as [ M   4+ ][Te 2− ][Te 2   2− ][Te 2   0 ] ( M  = Hf, Ti). The individual metal content can vary in different crystals, apparently forming a random substitutional solid solution (Hf 1- x  Ti  x  )Te 5 , with 0.15 ≤  x  ≤ 0.22.

Ti insertion in theMTe5(M= Zr, Hf) structure type: Hf0.78Ti0.22Te5

Ti insertion in theMTe₅(M= Zr, Hf) structure type: Hf_0.78Ti_0.22Te₅