Zeitschrift für Physik B Condensed Matter

, Volume 99, Issue 3, pp 333–338 | Cite as

The phase diagram of (NH4I)x(KI)1−x

  • M. Paasch
  • M. Winterlich
  • R. Böhmer
  • R. Sonntag
  • G. J. McIntyre
  • A. Loidl
Original Contributions


The χ,T phase diagram of (NH4I)x(KI)1−x has been determined using neutron diffraction experiments and dielectric spectroscopy. At low temperatures and with decreasing χ, the sequence γ, β, ε and glass phase has been detected. The critical concentration χc≈0.55 separates the glassy phase with frozen-in orientational disorder from the ε phase which reveals long-range orientational order. Close to χc our experiments reveal evidence for two subsequent glass transitions.


61.12.-q 77.20.+y 81.30.Dz 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Parsonage, N.G., Stavely, L.A.K.: in ‘Disorder in Crystals’, Clarendon Press, Oxford 1978, p. 311–388Google Scholar
  2. 2.
    Perry, C.H., Lowndes, R.P., J. Chem. Phys.51, 3648 (1969)CrossRefGoogle Scholar
  3. 3.
    Havighurst, R., Mack, E., Jr. Blake, F.C.: J. Am. Chem. Soc.47, 29 (1925)CrossRefGoogle Scholar
  4. 4.
    Stephenson, C.C., Landers, L.A., Cole, A.G.: J. Chem. Phys.20, 1044 (1952)CrossRefGoogle Scholar
  5. 5.
    Bostoen, C., Coddens, G., Wegener, W.: J. Chem. Phys.91, 6337 (1989)CrossRefGoogle Scholar
  6. 6.
    Fehst, I., Böhmer, R., Ott, W., Loidl, A., Haussühl, S., Bostoen, C.: Phys. Rev. Lett.64, 3139 (1990)CrossRefGoogle Scholar
  7. 7.
    Höchli, U.T., Knorr, K., Loidl, A.: Adv. Phys.39, 405 (1990)CrossRefGoogle Scholar
  8. 8.
    Binder, K., Reger, J.D.: Adv. Phys.41, 546 (1992)CrossRefGoogle Scholar
  9. 9.
    Binder, K., Young: Rev. Mod. Phys.58, 801 (1986)CrossRefGoogle Scholar
  10. 10.
    Berret, J.-F., Bostoen, C., Sauvajol, J.-L., Hennion, B., Haussühl, S.: Europhys. Lett16, 91 (1991); Berret, J.-F., Sauvajol, J.-L., Hennion, B.: J. Phys. Condens. Matter4, 9235 (1992); Berret, J.-F., Ravy, S., Hennion, B.: J. Phys. I (France)3, 1031 (1993)CrossRefGoogle Scholar
  11. 11.
    Umeki, T., Yagi, K., Terauchi, H.: J. Phys. Soc. J.63, 876 (1994)CrossRefGoogle Scholar
  12. 12.
    Berret, J.-F., Bostoen, C., Hennion, B.: Phys. Rev. B46 (1992)Google Scholar
  13. 13.
    Fehst, I., Hutton, S.L., Böhmer, R., Loidl, A., Hausühl, S.: Ferroelectrics127, 269 (1992)CrossRefGoogle Scholar
  14. 14.
    Paasch, M., McIntyre, G.J., Reehuis, M., Sonntag, R., Loidl, A.: Z. Phys. (submitted for publication)Google Scholar
  15. 15.
    Böhmer, R., Fujara, F., Hinze, G., Haussühl, S.: Solid State Commun.86, 183 (1993)CrossRefGoogle Scholar
  16. 16.
    Vegard, L.: Z. Phys.V 17 (1921)CrossRefGoogle Scholar
  17. 17.
    Hovi, V., Varteva, M.: Phys. Kondens. Materie3, 305 (1965)Google Scholar
  18. 18.
    Rietveld, H.M.: J. Appl. Crystallogr.2, 65 (1969); Rodriguez J.—Carvajal; FULLPROF: A Program for Rietveld Refinement and Pattern Matching Analysis, in “Abstracts of the Satellite Meeting on Powder Diffraction of the XXIth Congress of the IUCr, p. 127, Toulouse (1990)CrossRefGoogle Scholar
  19. 19.
    Loidl, A.: Phase Trans.34, 225 (1991)CrossRefGoogle Scholar
  20. 20.
    Winterlich, M., Böhmer, R., Loidl, A.: Phys. Rev. Lett. (1995) (in print)Google Scholar

Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • M. Paasch
    • 1
  • M. Winterlich
    • 1
  • R. Böhmer
    • 1
    • 2
  • R. Sonntag
    • 3
    • 4
  • G. J. McIntyre
    • 5
  • A. Loidl
    • 1
  1. 1.Institut für FestkörperphysikTechnische Hochschule DarmstadtDarmstadtGermany
  2. 2.Institut für Physikalische ChemieUniversität MainzMainzGermany
  3. 3.BENSCHahn-Meitner InstitutBerlinGermany
  4. 4.Institut für KristallographieUniverstität TübingenTübingenGermany
  5. 5.Institut Laue-LangevinGrenobleFrance

Personalised recommendations