| 纳米SrTiO3的光声光谱研究 |
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| 引用本文： | 周岚,张淑仪,傅少伟,王志,张立德.纳米SrTiO3的光声光谱研究[J].物理学报,1997,46(5):994-1000. |
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| 作者姓名： | 周岚 张淑仪 傅少伟 王志 张立德 |
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| 作者单位： | (1)南京大学声学研究所近代声学国家重点实验室; (2)中国科学院固体物理研究所 |
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| 摘 要： | 利用光声光谱技术对不同退火温度的纳米SrTiO3粉末进行了研究．结果表明，纳米SrTiO3粉末随退火温度升高，吸收边红移，说明能隙变窄，这与颗粒长大、晶格参数减小有关．在700nm附近出现的宽吸收带是由氧缺位俘获的电子在缺陷附加能级上的跃迁所产生的，其变化趋势强烈地依赖于颗粒尺寸
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| 关 键 词： | 纳米 钛酸锶 光声光谱 晶体 |
| 收稿时间： | 1996-06-28 |
PHOTOACOUSTIC SPECTRA STUDIES OF NANOMETER SrTiO3 |
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| ZHOU LAN,ZHANG SHU-YI,FU SHAO-WEI,WANG ZHI and ZHANG LI-DE.PHOTOACOUSTIC SPECTRA STUDIES OF NANOMETER SrTiO3[J].Acta Physica Sinica,1997,46(5):994-1000. |
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| Authors: | ZHOU LAN ZHANG SHU-YI FU SHAO-WEI WANG ZHI and ZHANG LI-DE |
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| Abstract: | Photoacoustic spectroscopy has been used to study nanoscaled SrTiO3 powder with different annealing temperature. The photoacoustic spectra show that the absorption edge of nanoscaled SrTiO3 powder has red shift with the rise of annealing temperature,which demonstrates that the energy gap becomes narrow. The decrease of energy gap is related to the growth of grains and the reduction of lattice parameter. In addition,the absorption band appeared around 700nm is induced by the transition of the captured electrons at the additional energy level of oxigen defects. The variation of the band is strongly dependent upon the sizes of the grains. |
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