1972 Volume 33 Issue 5 Pages 1396-1400
The effect of a two-dimensional pressure perpendicular to the ferroelectric axis on the Curie temperatures of triglycine sulphate (TGS) and Rochelle salt (RS) was studied. The Curie temperatures Tc varied linearly with the pressure p within the pressure range studied (p<100 bar). The rate of the Tc shift was ∂Tc⁄∂p=13±1 for TGS, ∂Tc⁄∂p=−22±1 for the upper Curie point of RS and ∂Tc⁄∂p=30±2 for the lower Curie point of RS, all in °C/k bar. These results agree with the predictions of the phenomenological theory (Ginzberg-Devonshire theory) and Janovec’s theory (V. Janovec: J. chem. Phys. 45 (1966) 1874).
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