Nonequilibrium dielectric permittivity of K_1−x(NH₄)_xH₂PO₄ solid solution

Abstract

The dielectric and polarization study of K_1−x(NH₄)_xH₂PO₄ mixed crystals has been made. In the crystals with 0.22 ≤ × ≤ 0.72 a transition to low temperature proton glass state is realized. It was found that the dielectric dispersion of proton glass compounds is well described by the Vogel-Fulcher law. The nature of a large thermal hysteresis of polarization in the mixed crystals (x ≤ 0.22) is discussed.

Key Words:

• ferroelectrics
• antiferroelectrics
• mixed crystals
• proton glass state
• dielectric dispersion
• thermal hysteresis