One of the important problems in the metallic ceramics investigation is the study of influence of a various type of impurity on them superconductivity property. In work the dependences of resistance from frequency and temperature dependences the conductivity and dielectric permeability of oxides LuBa₂Cu₃O₇ and LuBa₂Cu₃O_0.5S_5.5 were investigated.
Researches were carried out on frequency 1592Hz, which, as follows from the impedance diagrams, belongs to high-frequency area, in the field of temperatures 78-400. Temperature dependencies of conductivity the compounds have a Arrenius type. Dielectric permeability is monotonous increase with the temperature increase.
Presumably, in area 310-380 in LuBa₂Cu₃O₇ exists the piroelectric phase transition.
The occurrence of three various meanings of energy of activation in LuBa₂Cu₃O_0.5S_5.5 instead of two in LuBa₂Cu₃O₇ is probably given by presence at a sample of sulfur.
Increase of a share of oxygen in compound LuBa₂Cu₃O₇ and the addition of sulfur results in increase conductivity on the order, dielectric permeability decreases approximately in 5 times.
This work in part was supported by CRDF (grant EK-005-X1) and grant CRDF and Min. of Education of the Russian Federation (Post Doctoral Fellowship, award EK-005-X1, annex 07, No Y1-E-05-09).

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