Phase transitions and dielectric relaxation in dyeing KDP

Specific heat and dielectric constant of KH 2 PO 4 (KDP) crystal with the inclusion of the organic dyes molecules Chicago Sky Blue (CSB) and Amaranth (A) were studied in the temperature interval including the phase transition temperature ( T c = 122 K). It is shown that the inclusions affect the thermal properties of KDP crystal in the narrow vicinity of the transition point and dielectric properties in the whole polar phase - both at stained pyramidal sectors of the crystal. The complex impedance analysis (10 - 2 - 10 6 Hz) shows the noticable dispersion in paraelectric phase resulting from of the electrical conductivity the crystal increasing in stained sectors.