Abstract
Temperature dependences of the third-order nonlinear dielectric constant in the mixed crystals of Rb 1- x (NH 4 ) x H 2 PO 4 with x =0.25, 0.3, 0.4, 0.5, 0.6 and 0.7 were measured in the temperature range between 4 and 50 K. It was observed that the nonlinear dielectric constant in these crystals increases near the glass transition point and it is strongly dispersive at low frequencies. It was found that the third-order nonlinear dielectric constant is proportional to the imaginary part of the linear dielectric constant when measured under changing temperature at a fixed frequency.
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