The phase transition of two-dimensional squaric acid H2C4O4 studied by neutron scattering |
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Authors: | Emil J Samuelsen Dag Semmingsen |
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Institution: | 1. Institutt for Atomenergi, Kjeller, Norway |
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Abstract: | At Tc = 370 K squaric acid undergoes a phase transition, which was studied in detail by neutron scattering. The transition is essentially two-dimensional with β = 0.137 ± 0.010. Diffuse scattering above Te is found to be anisotropic. From “diffuse crystallography” it is concluded that proton disorder is not the dominant source of diffuse scattering. Individual molecules retain their low-temperature shape in the high-temperature phase. |
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