Oxidation products of Nb{sub 7}W{sub 10}O{sub 47}: A transmission electron microscopy study

Journal Article · Wed Nov 01 04:00:00 EST 1995 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/0022-4596(95)80061-S· OSTI ID:486284

Krumeich, F ^[1]

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1. Institut fuer Anorganische Chemie der Universitaet Bonn (Germany)

The oxidation of Nb{sub 7}W{sub 10}O{sub 47} at different temperatures leads to interesting products whose structures are characterized using high-resolution transmission electron microscopy. At low oxidation temperature (T{sub ox} = 500{degrees}C), fault boundaries appear which separate well-ordered microdomains exhibiting the threefold TTB superstructure of the 4:9 phase. In these boundaries, hitherto unobserved arrangements of hexagonal tunnels are ordered in a systematic way. The oxidation product obtained at 1000{degrees}C reveals a separation of WO{sub 3} slabs which are incorporated coherently into the 4:9-type structure. After oxidation at 1200{degrees}C, the 4:9 and 2:7 phases are observed predominantly. Furthermore, the electron diffraction patterns exhibit circular diffuse scattering indicating short-range order of the filled pentagonal tunnels.

• OSTI ID: 486284
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 119; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
NIOBIUM OXIDES
OXIDATION
TRANSMISSION ELECTRON MICROSCOPY
TUNGSTEN OXIDES