Composite samples based on microcrystalline Cu6PS5I superionic conductors, embedded in matrices of polyvinylacetate, epoxy and conducting glue, are produced. Temperature and frequency studies of complex electric conductivity and dielectric permittivity as well as dielectric loss of the obtained composites are carried out. The effect of differences in the composite production technology on the temperature of a second-order phase transition in the superionic phase, values of electrical conductivity, activation energy and dielectric permittivity is shown. (C) 2009 Elsevier B.V. All rights reserved.