Abstract
A new bismuth tellurium oxychloride was obtained by reaction of BiOCl and TeO 2 in air. According to energy dispersive X-ray spectroscopy and neutron powder diffraction refinement the composition of the substance was determined as Bi 0.87Te 2O 4.9Cl 0.87. The new compound crystallizes in the trigonal system space group R 3¯ (#148), Z=6, a=4.10793(4), c=31.1273(4) Å, χ 2=3.20, w R p=0.0369. Bi 0.87Te 2O 4.9Cl 0.87 has a new type of layered structure constructed by Bi–Te–O layers separated by chloride ions. The Te atoms in Bi 0.87Te 2O 4.9Cl 0.87 show an unusual umbrella-like environment. A comparison with known related structures has been made.
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