Research on Chemical Intermediates

, Volume 25, Issue 2, pp 229–242 | Cite as

Perovskite related phases in the Sr5Nb4O15 - SrTiO3 - Sr4Nb2O9 system

  • D. Pasero
  • R. J. D. Tilley


Phase relations have been investigated within the Sr5Nb4O15−SrTiO3−Sr4Nb2O9 region of the SrO−Nb2O5−TiO2 system with a view to clarifying the occurrence of fully oxidised perovskite related phases. Overall phase analysis was carried out by powder X-ray diffraction and microstructures were clarified by transmission electron microscopy. There is only one main composition triangle in this area at 1350°C. The tie-line between Sr5Nb4O15 and SrTiO3 contains a homologous series of hexagonal layered perovskite phases including Sr6Nb4TiO18 and Sr7Nb4Ti2O21. The phase Sr4Nb2O9 is a nonstoichiometric phase with a disordered perovskite structure. There is some extension of this phase along the Sr4Nb2O9−SrTiO3 tie-line, but SrTiO3 does not show a significant composition range. Samples with a composition Sr4Nb2O9, when heated at 900°C show several ordered modifications. Samples along the Sr4Nb2O9−SrTiO3 tie-line which are annealed at 900°C contain these ordered materials together with samples showing considerable short range order which increases as the Ti content increases.


Perovskite Diffuse Scattering Image Simulation Solid Solution Phase Phase Line 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    B.G. Hyde and S. Andersson, Inorganic Crystal Structures, Wiley-Interscience, New York, 1989.Google Scholar
  2. 2.
    D. Pasero and R.J.D. Tilley, J. Solid State Chem., in press.Google Scholar
  3. 3.
    M. Hervieu, B. Raveau, J. Lecompte, and J.P. Loup, Chemica Scripta 25, 206 (1985).Google Scholar
  4. 4.
    J. Sloan and R.J.D. Tilley, Eur. J. Solid State Inorg. Chem. 31, 673 (1996).Google Scholar
  5. 5.
    E. Connolly, J. Sloan, and R.J.D. Tilley, Eur. J. Solid State Inorg. Chem. 33, 371 (1996).Google Scholar

Copyright information

© Springer 1999

Authors and Affiliations

  • D. Pasero
    • 1
  • R. J. D. Tilley
    • 1
  1. 1.School of EngineeringUniversity of CardiffCardiffUK

Personalised recommendations