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The effect of paramagnetic doping on the dielectric response of K1.85Na0.15Ti4O9 layered ceramics

Vikram S. V., Maurya D., Chandel V. S.

Materials Science Poland

2009

Vol. 27, No. 1

191--199

Ceramic samples of layered polycrystalline (K1.85Na0.15)Ti4O9:xCu (0 ? x ? 0.8) have been prepared using high temperature solid state reaction. Room temperature X-ray diffratograms confirm the phase evolution. Room temperature electron paramagnetic resonance (EPR) data show that Cu2+occupies Ti4+ lattice sites giving rise to electric dipoles which increases electric permittivity. The absorption peak in EPR spectra gets broadened due to increased exchange interaction in heavily doped derivatives. Dielectric data reveal that occupancy of Cu2+ on Ti4+ leads to a decrease in dielectric losses and an increase in the electric permittivity as well.