The phase transition of two-dimensional squaric acid H2C4O4studied by Raman scattering
- 14 June 1979
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 12 (11), 2007-2014
- https://doi.org/10.1088/0022-3719/12/11/011
Abstract
The variation of order parameter with temperature has been studied by following the intensity of Raman lines forbidden in the high-temperature phase. The two-dimensional character of the transition is confirmed. Remnant scattering above Tc indicates the presence of molecular layers possessing low-temperature phase symmetry.Keywords
This publication has 8 references indexed in Scilit:
- The molecular and crystal structure of squaric acid (3,4-dihydroxy-3-cyclobutene-1,2-dione) at 121 °C: A neutron diffraction studyThe Journal of Chemical Physics, 1977
- The phase transition of two-dimensional squaric acid H2C4O4 studied by neutron scatteringJournal of Physics and Chemistry of Solids, 1977
- Raman study of squaric acidSolid State Communications, 1976
- Shell model investigation of the Raman scattering in the ordered and disordered phases of NH4BrThe Journal of Chemical Physics, 1975
- On the Structure of Deuterated Squaric Acid, C4D2O4, at Room Temperature.Acta Chemica Scandinavica, 1975
- A structural phase transition in squaric acidSolid State Communications, 1974
- Low frequency Raman spectra of ammonium halides in the disordered phases I and IIThe Journal of Chemical Physics, 1973
- The Crystal Structure of Squaric Acid.Acta Chemica Scandinavica, 1973