A new anatase-type phase in the system Mg-Ta-O-N
- Institut fuer Chemie, TU Berlin, Strasse des 17. Juni 135, D-10623 Berlin (Germany)
- Institut fuer Physikalische und Theoretische Chemie, TU Braunschweig, Hans-Sommer-Str. 10, D-38106 Braunschweig (Germany)
- Institut fuer Anorganische Chemie, RWTH Aachen, Landoldtweg 1, D-52056 Aachen (Germany)
- Theoretische Chemie, Universitaet Hannover, Am Kleinen Felde 30, D-30167 Hannover (Germany)
- Hahn-Meitner-Institut Berlin, Glienicker Str. 100, D-14109 Berlin (Germany)
- HASYLAB at DESY, Notkestr. 85, D-22603 Hamburg (Germany)
Magnesium doped tantalum oxynitrides were prepared by ammonolysis of amorphous mixed oxides. An orange colored anatase-type phase with the composition Mg{sub 0.05}Ta{sub 0.95}O{sub 1.15}N{sub 0.85} was found. It is metastable and undergoes a phase transformation to a baddeleyite-type phase between 900 and 1000deg. C. X-ray diffraction measurements indicate spacegroup I4{sub 1}/amd with lattice parameters a=391.986(6)pm and c=1011.19(3)pm. A possible anion ordering was examined by theoretical methods and neutron diffraction experiments. In addition, anosovite-type (Ti{sub 3}O{sub 5}) phases Mg{sub x}Ta{sub 3-x}O{sub 3x}N{sub 5-3x}; 0=<x=<0.3 were obtained. The electronic spectra of all phases were investigated by UV/vis spectroscopy.
- OSTI ID:
- 20905390
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 8; Other Information: DOI: 10.1016/j.jssc.2006.04.036; PII: S0022-4596(06)00254-4; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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