| 钛酸铅单晶纳米棒的生长机制和声子特性研究 |
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| 引用本文： | 邓昱,王金龙,朱克荣,周建新,李政道,尹真,张明生. 钛酸铅单晶纳米棒的生长机制和声子特性研究[J]. 光散射学报, 2006, 18(1): 5-9 |
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| 作者姓名： | 邓昱 王金龙 朱克荣 周建新 李政道 尹真 张明生 |
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| 作者单位： | 1. 南京大学固体微结构物理实验室和现代分析中心,南京,210093
2. 南京大学化学化工学院,南京,210093 |
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| 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=3.926,c=3.963),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440℃,低于单晶(490℃)。相变过程中“软模”E(1TO)的软化行为(从67 cm-1到56 cm-1)比单晶显著减弱,表明钛酸铅纳米棒中铁电性的弱化。
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| 关 键 词： | 钛酸铅单晶纳米棒 生长机制 声子特性 |
| 文章编号： | 1004-5929(2006)01-0005-05 |
| 收稿时间： | 2005-06-17 |
| 修稿时间： | 2005-06-17 |
Growth Mechanism and Phonon Characters of Single-Crystalline PbTiO3 Nanorods |
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| DENG Yu,WANG Jin-long,ZHU Ke-rong,ZHOU Jian-xin,LI Zheng-dao,YIN Zhen,ZHANG Ming-sheng. Growth Mechanism and Phonon Characters of Single-Crystalline PbTiO3 Nanorods[J]. Chinese Journal of Light Scattering, 2006, 18(1): 5-9 |
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| Authors: | DENG Yu WANG Jin-long ZHU Ke-rong ZHOU Jian-xin LI Zheng-dao YIN Zhen ZHANG Ming-sheng |
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| Abstract: | We synthesized single-crystalline PbTiO_3 nanorods with diameter of 5080 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 = 3.926? and c = 3.963?,respectively.Temperature dependence of Raman spectra shows that the ferro-papaelectric transition temperature of the PbTiO_3 nanorods is 440℃,lower than 490℃ for bulk crystals.A weaker softening behavior of the E(1TO) soft mode has been observed in PbTiO_3 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. |
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| Keywords: | single-crystalline PbTiO_3 nanorod growth mechanism phonon characters |
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