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钛酸钡铅纳米晶的结构和Raman光谱研究

Structure and Raman Spectra of Nanocrystalline (Ba,Pb)TiO_3
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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。 Nanocrystalline (Ba1-xPbxTiO3 (x=0.05) powders were prepared by a solgel process and controlling the crystal size through the heattreat temperature. The particlesize dependence of the ferroelectric phase transition in nanocrystalline BPT has been investigated by xray 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.
作者 陈建 唐新桂 张卫红
机构地区 中山大学分析测试中心 香港理工大学应用物理系
出处 《光散射学报》 2003年第3期127-130,共4页 The Journal of Light Scattering
基金 广东省自然科学基金(资助)001266
关键词 钛酸钡铅纳米晶 结构 RAMAN光谱 溶胶-凝胶工艺 尺寸效应 Sol-gel method Nano-crystalline Grain size Structure phase transition
分类号 TB383 [一般工业技术—材料科学与工程] O73 [理学—晶体学]
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参考文献11

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光散射学报
2003年 第3期

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