摘要
用正电子湮没谱学研究NaCl与NaY沸石机械混合后 ,NaCl在NaY中的固溶扩散过程 .分别测量不同质量比的NaCl NaY[(1— 2 0 ) % ]经 5 0 0℃烘烤 1h ,NaCl NaY(15 % )经不同温度烘烤 1h ,以及NaCl NaY(15 % )经 5 0 0℃烘烤不同时间后的正电子寿命谱 .所有寿命谱都出现了 5个寿命分量 ,其中第 3,4 ,5寿命分别与 β笼、超笼及沸石微粒界面空洞的大小和数量相关 .实验表明正电子湮没谱学能敏感地表征NaCl在NaY中的固溶扩散过程 .
A series of samples, prepared from mechanical mixtures of NaCl with NaY zeolite and resulting in the dispersion of NaCl in NaY, was studied by position annihilation spectroscopy. We measured the positron lifetime spectroscopy as a function of the weight ratio of the NaCl-NaY zeolite heated at 500degreesC for 1h, as a function of the heating temperature held for 1h, and as a function of the heating duration at 500degreesC for NaCl/NaY (15 %). All the lifetime spectra were resolved into five components, in which the third, fourth and fifth components are related to the positron annihilation in beta cage, supercage and interface void respectively. The experimental results showed that position annihilation spectroscopy is sensitive to the change of the dispersion of NaCl in NaY zeolite.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第11期2929-2933,共5页
Acta Physica Sinica
基金
湖北省自然科学基金 (批准号 :2 0 0 1S2 0 71)资助的课题~~
