13C-NMR study of the phase transition in the layered antiferroelectric squaric acid View Full Text


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Article Info

DATE

1987-09

AUTHORS

G. Fischer, J. Petersson, D. Michel

ABSTRACT

The temperature dependence of the13C-NMR spectra of undoped crystals of the layered antiferroelectric squaric acid (C4H2O4; H2SQ was measured at a resonance frequency of about 75 MHz by means of the1H−13C double resonance technique. The relation between the order parameter and the chemical shift tensors at the13C nuclei is discussed in detail. The line splitting in the ordered phase belowTc≈100°C is shown to be proportional to the order parameter. The phase transition is of first order and can be well described by a Landau expansion of the free energy. The results are compared to previous determinations of the temperature dependence of the order parameter. The spin lattice relaxation time of the13C system is estimated to be 5000–7500 s at 5°C and the given magnetic field. More... »

PAGES

387-393

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01307263

DOI

http://dx.doi.org/10.1007/bf01307263

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1008042456


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