| 钛酸钡铅纳米晶的结构和Raman光谱研究 |
| |
| 引用本文： | 陈建,唐新桂,张卫红.钛酸钡铅纳米晶的结构和Raman光谱研究[J].光散射学报,2003,15(3):127-130. |
| |
| 作者姓名： | 陈建 唐新桂 张卫红 |
| |
| 作者单位： | 1. 中山大学分析测试中心,广州,510275
2. 香港理工大学应用物理系,香港 |
| |
| 基金项目： | 广东省自然科学基金(资助)001266 |
| |
| 摘 要： | 以醋酸钡、醋酸铅和钛酸丁酯为原料,醋酸和甲醇为溶剂,采用溶胶-凝胶工艺制备了不同晶粒大小的掺铅(5mol%)钛酸钡(BPT)纳米晶。用XRD、TEM和Raman研究了BPT样品的晶粒大小、结构及其相变特性。结果表明BPT纳米晶最低晶化温度为550℃,高于650℃热处理的纳米晶BPT在常温下为四方相。随着晶粒尺寸的减小,BPT纳米晶由四方相向立方相过渡。
|
| 关 键 词： | 溶胶-凝胶法 BPT纳米晶 晶粒尺寸 结构相变 |
| 文章编号： | 1004-5929(2003)03-0127-04 |
| 收稿时间： | 2003/6/30 |
| 修稿时间： | 2003年6月30日 |
Structure and Raman Spectra of Nanocrystalline(Ba,Pb)TiO3 |
| |
| Abstract: | Nanocrystalline (Ba1-xPbxTiO3 (x=0.05) powders were prepared by a solgel process and controlling the crystal size through the heattreat temperature. The particlesize dependence of the ferroelectric phase transition in nanocrystalline BPT has been investigated by xray diffraction (XRD) and Raman scattering. The results showed that at room temperature, the tetragonality ratio (c/a) decreased monotonically and became more diffusive in nature with decreasing particle size, the phase transformation from tetragonal to pseudocubic symmetry occurs at below 20 nm. |
| |
| Keywords: | Sol-gel method Nano-crystalline Grain size Structure phase transition |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
