Advertisement

Light Scattering Studies of the Two-Dimensional Phase Transition in Squaric Acid

  • Erling Fjær
  • Jorunn Grip
  • Emil J. Samuelsen
Chapter
  • 226 Downloads
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 50)

Abstract

Crystalline squaric acid, H2C4O4, has attracted considerable interest among physicists due to its simple planar geometry [1] and the existence of a structural phase transition at about 100 C [2]. Since proton ordering in hydrogen “bonds seems to play a key role in the phase change, it was soon realized that one had at hand a material which might show interesting two-dimensional Ising-type behaviour [3]. Information gained from birefringence studies [2] and neutron scattering [3] did in fact support such a view.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    Semmingsen D., Acta Chem. Scand. 27 3961 (1973)CrossRefGoogle Scholar
  2. [2]
    Semmingsen D. and Feder J., Solid State Commun. 15 1369 (1974)ADSCrossRefGoogle Scholar
  3. [3]
    Samuelsen E.J. and Semmingsen D., J. Phys. Chem. Solids 38 1275 (1977)Google Scholar
  4. [4]
    Baglin F.G. and Rose C.B., Spectrochim. Acta. 26A 2293 (1970)ADSGoogle Scholar
  5. [5]
    Nakashima S. and Balkanski M., Solid State Commun. 19 1225 (1976)ADSCrossRefGoogle Scholar
  6. [6]
    Bougeard D. and Novak A., Solid State Commun. 27 453 (1978)ADSCrossRefGoogle Scholar
  7. [7]
    Samuelsen E.J., Fjœr E. and Semmingsen D., J. Phys. C. (Solid State Physics) (to be published (1979))Google Scholar
  8. [8]
    Fjær E., Grip J. and Samuelsen E.J., to be publishedGoogle Scholar
  9. [9]
    Geisel T. and Keller J., J. Chem. Phys. 62 3777 (1975)ADSCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Erling Fjær
    • 1
  • Jorunn Grip
    • 1
  • Emil J. Samuelsen
    • 1
  1. 1.Institutt for Almen Fysikk, Norwegian Institute of TechnologyUniversity of TrondheimTrondheim-NTHNorway

Personalised recommendations