Positronium lifetime measurements in micro- and mesoporous ferrisilicates

Trần Quốc Dũng, K. Lázár

Research output: Contribution to journalArticle

Abstract

Positron annihilation lifetime, Doppler broadening measurements have been used to study microporous FER and MFI structures containing framework subtituted iron in different amounts. Mesoporous SBA-15 samples without and with iron introduced to the pore walls were also investigated by these methods. Mössbauer measurements have been accompanied to prove the extent of isomorphous incorporation of iron into the different structures. The results reveal a certain dependence of lifetimes on the various pore and channel sizes. Addition of iron does not influence significantly the observed lifetimes in FER microporous systems. However a slight decrease of lifetimes can be observed in the MFI samples. The effect of addition of iron in mesoporous SBA-15 system is more expressed. Supplement of iron also has an influence on the S parameter of Doppler broadening spectra.

Original languageEnglish
Pages (from-to)49-54
Number of pages6
JournalRadiation Physics and Chemistry
Volume139
DOIs
Publication statusPublished - Oct 1 2017

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Keywords

  • Iron ion-exchanged zeolite
  • Porous Solids
  • Positron Annihilation
  • Trapped o-Ps
  • Zeolites

ASJC Scopus subject areas

  • Radiation

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