Variation of the Dielectric Constant of Rochelle Salt Crystals with Frequency and Applied Field Strength

Abstract

The dielectric constant of Rochelle salt crystals perpendicular to the $a$ axis at 0°C was measured over the frequency range of 30 to 30×${10}^6$ cycles/sec. Following a fairly uniform decline from 62,000 at 30 cycles to 220 at ${10}^7$ cycles, the dielectric constant drops abruptly to negative values (inductive reactance) at 14×${10}^7$ cycles. This frequency is independent of the size and mounting of the crystal and thus appears to be critical for this crystalline material.