Dielectric-constant logarithmic correction inRbH2PO4above the Curie point

Dielectric-constant measurements in rubidium dihydrogen phosphate at frequencies from 20 Hz to 10 kHz, within an interval of about ±30 K from the Curie point, have been performed with a digital universal bridge. The relative accuracy of capacitance readings was better than 0.1%. Asymptotically close to $T_c$=145.90±0.02 K and within an interval of 20 K above $T_c$, the data appear to follow reasonably well a Curie-Weiss law with logarithmic corrections, first predicted by Larkin and Khmel’nitskii for uniaxial ferroelectrics, and then change over gradually to normal Curie-Weiss behavior.