Both the dielectric and the dilatometric measurements were made under various pressures up to 2 kbar. With increasing pressure, the transition temperature (T n ) decreases rapidly with the pressure coefficient dT n /dp=13 degrees C kbar -1 , and this decrease in T n 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 T n .
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Yasuda et al. (1978) studied this question.