Oxidation products of the niobium tungsten oxide Nb{sub 4}W{sub 13}O{sub 47}: A high-resolution scanning transmission electron microscopy study

Journal Article · Thu Jun 15 04:00:00 EDT 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.02.020· OSTI ID:20905321

Krumeich, Frank ^[1]; Nesper, Reinhard ^[1]

---

1. Laboratory of Inorganic Chemistry, ETH Zurich, CH-8093 Zurich (Switzerland)

Nb{sub 4}W{sub 13}O{sub 47}, a member of the solid solution series Nb{sub 8-n}W{sub 9+n}O{sub 47} (0=<n=<5), crystallizes in a threefold superstructure of the tetragonal tungsten bronze structure. While the oxidation of this reduced phase at T{sub OX}=1200deg. C leads to a separation into the thermodynamically stable phases, lower oxidation temperatures result in products that comprise new structural elements and ordering variants. The characterization of the oxidation products obtained at T{sub OX}=1000 deg. C was performed by scanning transmission electron microscopy applying a high-angle annular dark field detector. At the selected imaging conditions (Z contrast), not only the metal positions are revealed by this technique but valuable additional information about the elemental distribution can be obtained simultaneously.

• OSTI ID: 20905321
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 6 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NIOBIUM OXIDES
OXIDATION
SOLID SOLUTIONS
TEMPERATURE RANGE 1000-4000 K
TRANSMISSION ELECTRON MICROSCOPY
TUNGSTEN BRONZE
TUNGSTEN OXIDES