Abstract
Lead titanate nanopowders were fabricated by mechanochemical synthesis. The obtained materials were characterized by X-ray diffraction, high resolution electron microscopy and Raman scattering. The X-ray diffraction showed the perovskite structure of the powder. It was found that: (1) the powder consists of loosely packed grains with a broad distribution of sizes between a few nm and 45 nm, (2) the grains of sizes larger than about 30 nm exhibit well developed crystalline structure, (3) the Raman lines of PbTiO3 nanopowder exhibit a conspicuous broadening in comparison to Raman lines of the bulk material, and 4) in the spectrum of nanopowder the lines related to A1(1TO), E(2TO) and A1(3TO) modes are shifted into lower frequencies and their spectral linewidth increase and there is no significant change in frequency shift for the remaining modes. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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