Structural Investigation of the Incommensurate Modulated Ta2O5⋅Al2O3 System

  • Denissa T. Murphy
  • Veronica Fung
  • Siegbert SchmidEmail author


The (1−x)Ta2O5xAl2O3 solid solution series was re-investigated using synchrotron X-ray powder diffraction and neutron powder diffraction data. Structures were refined using the Rietveld method and an incommensurately modulated composite structure approach in superspace group Xmmm(0β0)s00 with a composition dependent modulation wave vector. Variable temperature synchrotron X-ray powder diffraction data were collected between 27 and 990 C. The magnitude of the modulation wave vector was found to be constant over most of the temperature range.


Neutron Powder Diffraction Neutron Diffraction Data Main Reflection Solid Solution Range Incommensurate Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



A part of this work was carried out on the powder diffraction beamline at the Australian Synchrotron, Victoria, Australia, and the authors would like to thank Dr Qinfen Gu for his assistance. Neutron data were collected at ANSTO and the authors thank Dr James Hester for his assistance.


  1. 1.
    Lagergren S, Magneli A (1952) Acta Chem Scand 6:444–446 CrossRefGoogle Scholar
  2. 2.
    Grey IE, Mumme WG, Roth RS (2005) J Solid State Chem 178:3308–3314 CrossRefGoogle Scholar
  3. 3.
    Roth RS, Waring JL (1970) J Res Natl Bur Stand A 74:485–493 CrossRefGoogle Scholar
  4. 4.
    Schmid S, Withers RL, Thompson JG (1992) J Solid State Chem 99:226–242 CrossRefGoogle Scholar
  5. 5.
    Schmid S, Fütterer K, Thompson JG (1996) Acta Crystallogr, Sect B 52:223–231 CrossRefGoogle Scholar
  6. 6.
    Schmid S, Fung V (2012) Aust J Chem 65:851–859 CrossRefGoogle Scholar
  7. 7.
    Petřiček V, Dušek M, Palatinus L (2006) Jana2006. The crystallographic computing system. Institute of Physics, Praha Google Scholar
  8. 8.
    Stokes HT, Campbell BJ, van Smaalen S (2011) Acta Crystallogr, Sect A 67:45–55 CrossRefGoogle Scholar
  9. 9.
    Perez-Mato JM, Madariaga G, Zúñiga FJ, Garcia Arribas A (1987) Acta Crystallogr, Sect A 43:216–226 CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Denissa T. Murphy
    • 1
  • Veronica Fung
    • 1
  • Siegbert Schmid
    • 1
    Email author
  1. 1.School of ChemistryThe University of SydneySydneyAustralia

Personalised recommendations