用低温正电子湮没寿命谱研究NaY,USY及γ-Al₂O₃的表面结构

用低温正电子湮没寿命谱研究NaY,USY及γ-Al 2 O 3 的表面结构 Research on the Surface Structures of the NaY,USY and γ-Al 2 O 3 by Positron Lifetime Spectroscopy in Low Temperature 石竹玉 SHI Zhuyu 1 first-author 朱俊 ZHU Jun 1 武汉大学物理科学与技术学院 武汉大学物理科学与技术学院 School of Physics and Technology,Wuhan University School of Physics and Technology,Wuhan University 以20～300K的低温正电子湮没寿命谱学方法研究了NaY沸石、USY沸石及多孔γ-Al2O3的表面结构.实验分别测量了脱水后三样品的低温正电子湮没寿命谱,其中NaY,USY用5个寿命分量分解,γ-Al2O3用4个寿命分量分解.实验结果表明,较短的寿命分量与测量温度无关,而最长的寿命分量（约40ns）则与测量温度有关,不同的寿命温度相关性表明NaY的表面结构与γ-Al2O3的不同. We did some research on the surface structures of the NaY zeolite,USY zeolite and porous γ-Al2O3 by positron annihilation lifetime spectroscopy in low temperature of 20-300 K.We measured the positron lifetimes of the three dehydration samples in low temperature respectively,in which,the lifetime spectra of NaY and USY were resolved into five components,and that of the γ-Al2O3 were resolved into four components.The results showed that the shorter lifetimes were not relative to the measure temperature,but the longest lifetime（about 40 ns） was relative to the measure temperature.The different relativity of the lifetime-temperature means the different surface structures of the NaY zeolite from that of the porous γ-Al2O3. 正电子湮没寿命谱学 低温 多孔材料 positron annihilation lifetime spectroscopy low temperature porous material 10.14188/j.1671-8836.2013.04.016 TB383.4 国家自然科学基金资助项目（10675093） 2013-04-01 2021-04-01 4 59