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Structural Phase Transition in Tetrafluoroaluminates

  • J.M. Launay, J.Y. Laval, A. Gibaud, A. Bulou and J. Nouet...

Abstract

It is shown that the detailed investigation of an irreversible SPT implies the combination of X-ray, neutron and electron diffraction data. This diffraction analysis is applied to K Al F4 and Rb Al F4. There is a good agreement between the three diffraction techniques in the case of Rb Al F4 where the SPT is reversible. On the other hand, for K Al F4 room temperature quadratic phase, electron diffraction exhibits exta spots which are not evidenced by X-ray and neutron diffraction. Finally the assumption of an orthorombic lattice from neutron scattering for the low temperature phase is consistant with electron diffraction results.

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+ Laboratoire d'Etude et de Synthèse des Microstructures EPA 912 CNRS-ESPCI, 10, rue Vauquelin - 75231 PARIS cedex 05 France
* Laboratoire de Physique de I'Etat Condensé ERA 682, Université du Maine LE MANS Cedex, France

References

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(1) Brosset, C. 1938 Z. Anorg. Allgem. Chem. 239, 301
(2) Bulou, A. and Nouet, J. 1982, J. Phys. C : Solid State Phys. 15, 183196
(3) Fourquet, J.L., Plet, F., Courbion, G., Bulou, A. and de Pape, R. 1979, Rev. Chim. Miner. 16, 490500
(4) Kleeman, W., SchÅFer, F.J. and Nouet, J. 1982, J. Phys. C : Solid State Phys. 15, 197208
(5) Bulou, A., Rousseau, M. Nouet, J., Loyzance, P.L., Mkhlisse, R. and Couzi, M. 1983 J. Phys. C : Solid State Phys. (to be published)
(6) Nouet, J., Pannetier, J and Fourquet, J.L. 1981, Acta Cryst. B 37, 3234
(7) Wolff, and Wisser, 1969 J. Appl. Cryst. 2, 89

Structural Phase Transition in Tetrafluoroaluminates

  • J.M. Launay, J.Y. Laval, A. Gibaud, A. Bulou and J. Nouet...

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