Dielectric Dispersion in KDP Crystals with Complex Organic and Inorganic Impurities

Abstract

Dielectric properties of KH₂PO₄ (KDP) crystals doped with complex organic (Amaranth, Chicago Sky Blue, Xylenol Orange) and inorganic (Potassium PentoChloroRuthenate) molecules were analyzed in the frequency range of 10 mHz–10 MHz. A noticeable dispersion in paraelectric phase at 30–80°C is revealed. In some crystals with dyes the deviation of Cole-Cole diagrams from Debye-type relaxation is shown. Conductivity and activation energy of the conductivity mechanism at high temperature are determined.

Keywords:

• KDP
• impurity
• dyes, dielectric relaxation, specific resistivity

4. Acknowledgments

We thank Prof. L.N. Rashkovich, Drs. N.P. Zaitseva, B. Kahr, and Yu. Velikhov for the samples of pure and doped KDP crystals. This work was supported by Russian Foundation for Basic Research (project no. 08-02-90033).