New barium niobium sulfides, types 12H and 18R

A new barium niobium sulfide was prepared with the composition of BaNb 3.5S 7.6. The sulfide has two crystal structures of types 12H and 18R. They are probably polytypic in relation. The X-ray powder diffraction patterns of the structures are indexable with the lattice parameters of a = 0.33315(4) n...

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Bibliographic Details
Published in:Materials research bulletin 2001-05, Vol.36 (7), p.1205-1214
Main Authors: Masanobu, Saeki, Masatsune, Ohta, Yoshiyuki, Yajima, Gay-Ying, Yang
Format: Article
Language:English
Subjects:
A. Chalcogenides
B. Chemical synthesis
C. Electron diffraction
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Halides, chalcogenides and analogous compounds of group vb
Inorganic compounds
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
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Summary:A new barium niobium sulfide was prepared with the composition of BaNb 3.5S 7.6. The sulfide has two crystal structures of types 12H and 18R. They are probably polytypic in relation. The X-ray powder diffraction patterns of the structures are indexable with the lattice parameters of a = 0.33315(4) nm and c = 3.6944(4) nm for 12H, and a = 0.33333(4) nm and c = 5.5646(9) nm for 18R in hexagonal setting. Electron diffraction patterns of these structures exhibit supercells of 3a × 3a. Single phases of 12H and 18R were prepared by employing iodine as a mineralizing agent.
ISSN:0025-5408
1873-4227
DOI:10.1016/S0025-5408(01)00613-4