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Perovskite PbTiO 3 nanopowders were synthesized by citric acid sol–gel combustion method using citric acid (CA) as a reductant/fuel and nitrate as an oxidant at 700°C. The particle sizes were in the range of 40–50nm observed by transmission electron microscopy (TEM). The photoluminescence (PL) spectrum revealed that an intense emission at 415nm was ascribed to the Pb 2+ ion 3 ...
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