Acta Phys. -Chim. Sin. ›› 1991, Vol. 7 ›› Issue (04): 425-429.doi: 10.3866/PKU.WHXB19910410

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Positron Annihilation and Electrostatic Field in Zeolites

Gao Zi; Yang Xue-Min; Wang Yu   

  1. Department of Chemistry, Fudan University, Shanghai 200433; Department of Physics, Fudan University
  • Received:1990-04-02 Revised:1990-10-04 Published:1991-08-15
  • Contact: Gao Zi

Abstract: Positron annihilation measurements have been carried ont for Y zeolites with different types of cations, faujasites with different Si/Al ratios and zeolites with different structures. The o-Ps annihilation lifetimes are closely correlated with the variations of the electrostatic field in the zeolites. The o-Ps lifetimes are shortened when the electrostatic field in the zeolites is increased. Positron annihilation data show that the electrostatic field of cation-exchanged Y zeolites varies in the order of KY

Key words: Positron annililation spectroscopy, Zeolites, Electrostatic field, Pore size