Abstract
The results of dielectric studies of MCM-41 sili cate matrices with cellular pores (37.0 and 26.1 A in diameter) filled by binary mixtures of K1−xAgxNO3 (x=0, 0.05, 0.10) are reported in comparison with those obtained for bulk salts of the same composition in the temperature range of structural phase transitions. It has been revealed that, upon heating, the nanocomposites undergo transitions from crystal modification II to phase I, as in bulk KNO3, whereas the bulk mixtures with x=0.05 and 0.10 have a complex structure in accordance with the phase diagram. It has been shown that embedding binary salts and pure potassium nitrate in pores with a diameter of 26.1A results in the formation of an intermediate ferroelectric phase upon cooling. The permittivity and electrical conductivity are found to increase with increasing AgNO3 concentration in bulk samples, as well as with decreasing pore size in the nanocomposites for all values of x.
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