Abstract- Single-phase perovskite 0.65PMN–0.35PT was achieved at low temperature by gel-combustion method. The phase composition, microstructure and optical properties of nanopowder structures based on PMN–PT were studied. PMN–PT powder with 1 mol% of excess Pb(NO3)2 was prepared by auto-combustion method from the constituent nitrates and alkoxide materials. A high yield of perovskite PMN–PT with nano-sized particles was obtained after the synthesis. And calcinated at 700oC, 750oC, 800oC and 850◦C. Single-phase PMN–PT structures without any pyrochlore phase were obtained after the calcination at 850oC. With used FTIR spectra we determine refractive index (n), extinction coefficient (k), real and image dielectrics as a function of wavenumber (K).

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