Hydrostatic pressure effect on the phase transition of squaric acid H2C4O4
- 28 April 1978
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 11 (8) , L299-L303
- https://doi.org/10.1088/0022-3719/11/8/002
Abstract
Both the dielectric and the dilatometric measurements were made under various pressures up to 2 kbar. With increasing pressure, the transition temperature (Tn) decreases rapidly with the pressure coefficient dTn/dp=13 degrees C kbar-1, and this decrease in Tn supports the tunnelling model of the proton as a microscopic model for the phase transition. The large anomaly of the strain along the a(c) and the b axes was found close to Tn.Keywords
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