SYNTHESIS, HIGH-RESOLUTION ELECTRON-MICROSCOPY AND CRYSTAL-STRUCTURE REFINEMENT OF THE CLUSTER COMPOUND BA3NB16O23 BY X-RAY AND NEUTRON-DIFFRACTION

Authors
ZUBKOV VG PERELEYAEV VA TYUTYUNNIK AP KONTSEVAYA IA VORONIN VI SVENSSON G
Citation
Vg. Zubkov et al., SYNTHESIS, HIGH-RESOLUTION ELECTRON-MICROSCOPY AND CRYSTAL-STRUCTURE REFINEMENT OF THE CLUSTER COMPOUND BA3NB16O23 BY X-RAY AND NEUTRON-DIFFRACTION, Journal of alloys and compounds, 203(1-2), 1994, pp. 209-216
Citations number
26
Categorie Soggetti
Chemistry Physical","Metallurgy & Mining","Material Science
Journal title
Journal of alloys and compounds → ACNP
ISSN journal
09258388
Volume
203
Issue
1-2
Year of publication
1994
Pages
209 - 216
Database
ISI
SICI code
0925-8388(1994)203:1-2<209:SHEACR>2.0.ZU;2-J
Abstract
Ba3Nb16O23 was prepared by reducing a mixture of BaCO3 and Nb2O5 with acetylene soot under vacuum at 1550-1600-degrees-C. The structure was determined from high resolution electron microscopy images and was ref ined by the Rietveld technique using X-ray and neutron powder diffract ion data. The unit cell parameters are a = 20.9301(4) angstrom, b = 12 .4785(3) angstrom and c = 4.1619(1) angstrom, space group Cmmm, Z = 2. The crystal structure can be described as an intergrowth of BaNbO3 an d NbO. Characteristic building units are quadruple chains of corner-sh aring Nb6 octahedra connected via columns with a perovskite-type struc ture to form a three-dimensional network.