| 硅酸盐玻璃中银纳米颗粒的原子状态 |
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| 引用本文： | 杨修春,DUBIEL M,HOFMEISTER H,周国治. 硅酸盐玻璃中银纳米颗粒的原子状态[J]. 材料研究学报, 2006, 20(6): 626-630 |
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| 作者姓名： | 杨修春 DUBIEL M HOFMEISTER H 周国治 |
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| 作者单位： | 同济大学材料科学与工程学院,上海,200092;Martin-Luther University of Halle Wittenberg, Department of Physics, D-06108 Halle, Germany;Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany;北京科技大学物理化学系,北京,100083 |
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| 基金项目： | 上海市纳米科技专项基金;上海市重点基础研究项目 |
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| 摘 要： | 在硅酸盐玻璃中原位合成了平均颗粒尺寸为2．8nm、4．0nm和7．0nm的银纳米颗粒．使用银K-边X-射线吸收精细结构谱（XAFS）研究了纳米银颗粒的尺寸和玻璃基质对银原子状态和纳米银颗粒热膨胀系数的影响．结果表明，随着纳米银颗粒尺寸的减小，银原子的静态无序度增大，非和谐振动加剧．根据非和谐爱因斯坦模型和热力学微扰理论，计算了银纳米颗粒的线性膨胀系数．结果表明，纳米银颗粒越小，热膨胀系数越大．
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| 关 键 词： | 材料科学基础学科 银纳米颗粒 静态无序 爱因斯坦温度 非和谐振动 线性膨胀系数 |
| 文章编号： | 1005-3093(2006)06-0626-00 |
| 收稿时间： | 2005-10-11 |
| 修稿时间： | 2006-04-23 |
Atomic states of Ag nanoparicles in silicate glass |
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| YANG Xiuchun,DUBIEL M,HOFMEISTER H,ZHOU Guozhi. Atomic states of Ag nanoparicles in silicate glass[J]. Chinese Journal of Materials Research, 2006, 20(6): 626-630 |
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| Authors: | YANG Xiuchun DUBIEL M HOFMEISTER H ZHOU Guozhi |
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| Affiliation: | 1.School of Materials Science and Engineering, Tongji University, Shanghai 200092 ; 2.Department of Physics, Martin Luther University at Halle-Wittenberg, D-06108 Halle, Germany ; 3.Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany 4.Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083 |
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| Abstract: | Ag nanoparticles (mean size is 2.8 nm,4.0 nm or 7.0 nm) were in-situ synthesized in commercial soda-lime silicate glasses.The effects of particle size and glass matrix on vibration properties of Ag atoms in Ag nanoparticles were investigated by Ag K-edge X-ray absorption fine structure spectra (XAFS).The results show that static order of Ag atoms increases,and anharmonic vibration of Ag atoms becomes stronger when Ag particle size decreases.Based on anharmonic Einstein model and thermody- namic perturbation theory,thermal expansion coefficients of Ag nanoparticles were calculated.The results show that the smaller the particle size,the lager the thermal expansion coefficient is. |
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| Keywords: | foundational discipline in materials science silver nanoparticle static order Einstein temperature anharmonic vibration thermal expansion coefficient |
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