Bi3Nb17O47: a potentially ferroelectric crystal structure of the tungsten bronze type
- 1 January 1971
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1280-1286
- https://doi.org/10.1039/j19710001280
Abstract
The crystal structure of Bi3Nb17O47 has been determined from three-dimensional X-ray data and refined to R 0·092 for 1278 visually estimated independent reflections. The crystals are orthorhombic with a= 12·516 ± 0·005, b= 37·14 ± 0·02, c= 3·922 ± 0·002 Å, space group Pba2, and Z= 2. Bi3Nb17O47 belongs to a family of Ax(MO)yMO3 compounds, which are based on the tetragonal bronze structure, with (MO) in some pentagonal tunnels. The bismuth atoms are statistically arranged among a number of sites in the remaining pentagonal and diamond shaped tunnels, and tend towards a one-sided four-co-ordination. The structure is potentially ferroelectric.Keywords
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