Phase transition and phonon characteristics of PbTiO3 single-crystal nanorods prepared in NaCl flux

Abstract

Abstract. By annealing PbTiO 3 (PT) nanoparticles together with surfactants in NaCl flux, single-crystal PT nanorods were prepared with diameters of 60-80nm and lengths of several micrometers. The PT nanorods are in tetragonal phase and grow along the (100) -1 to 50 cm -1 , whereas the mode B1+E keeps its frequency almost unchanged at 286 cm -1 . It is also noticed that both frequency and damping constant of mode E(1TO) show rapid changing with temperature only when temperature beyond 380 o C, blow the temperature they change very gradually. To explain the particular properties of the PT nanorods, the formation mechanism and an enhanced size effect have been discussed.