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X-ray powder diffraction and high-resolution electron microscopy studies of new intergrowth compounds between Ba(Nb,Zr)O3 and NbO
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
2001 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 314, no 1-2, 67-77 p.Article in journal (Refereed) Published
Abstract [en]

The structure of Ba2Nb5O9 can be described as intergrown layers of perovskite (BaNbO3) and NbO. The compound is a member of the BanNbn+3mO3(n+m) homologous series where n and m are the perovskite and NbO slab widths, respectively. The substitution of Zr for Nb according to the formula Ba2Nb5−xZrxO9 has been investigated. The increase of the c axis length as a function of the overall composition shows, in combination with microanalysis in scanning and transmission electron microscopes, that the maximum value of x is approximately 0.6. The microanalysis indicates that Zr prefers the MO6 octahedra in the perovskite slab. The X-ray powder diffraction (XRD) analysis and high-resolution electron microscopy (HREM) images show that for 0.6≤x≤1.5 a disordered intergrowth of Ba(Nb;Zr)O3 and NbO layers is formed. The XRD patterns and microanalyses of cation content showed that a new homologue Ba3(Nb,Zr)6O12 with n:m=3:1 in the series Ban(Nb;Zr)n+3mO3(n+m) is formed in some of these samples. It has the unit cell parameters a=4.1725(6) Å and c=16.429(3) Å and crystallises in space group P4/mmm, Z=1. The structure of this compound was determined by comparing simulated and experimental HREM images.

Place, publisher, year, edition, pages
2001. Vol. 314, no 1-2, 67-77 p.
Keyword [en]
scanning and transmission, electron microscopy
National Category
Inorganic Chemistry
Research subject
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-43877DOI: 10.1016/S0925-8388(00)01224-XOAI: oai:DiVA.org:su-43877DiVA: diva2:371579
Available from: 2010-11-21 Created: 2010-10-29 Last updated: 2017-12-12Bibliographically approved

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