中文摘要：

采用改进熔盐法经一步反应合成了直径50-80nm，长度为1-5μm的单晶PbTiO3纳米棒。纳米棒沿（100）晶向生长，其形成可以用Ostwald成熟机制来解释。PbTiO3纳米棒晶格结构为四方（a=b=3．926A，c=3．963A），与单晶相比四方性明显下降。通过变温拉曼测试发现其铁电-顺电相变温度为440E，低于单晶（490 ℃）。相变过程中“软模”E（1TO）的软化行为（从67cm^-1到56cm^-1）比单晶显著减弱，表明钛酸铅纳米棒中铁电性的弱化。

英文摘要：

： We synthesized single - crystalline PbTiO3 nanorods with diameter of 50 - 80 nm and length of 1 - 5 μm through a one - step reaction in NaCl flux. The growth of the nanorods can be explained by the Ostwald ripening mechanism. The nanorods were in tetragonal structure with lattice parameters of a = 3. 926A and c = 3. 963A, respectively. Temperature dependence of Raman spectra shows that the ferro - papaelectric transition temperature of the PbTiO3 nanorods is 440℃, lower than 490℃ for bulk crystals. A weaker softening behavior of the E（1TO） soft mode has been observed in PbTiO3 nanorods （from 67 cm^-1 to 56 cm^-1） than that in crystals （from 82 cm^-1 to 45 cm^-1）, showing weakening of ferroelectricity.