Download Now. Save my name, email, and website in this browser for the next time I comment. Sign in. Password recovery. Recover your password. Forgot your password? By magnetic and 0, quenching one can obtain the Ps lifetime values for B-cage and supercage in NaY zeolite structures, namely 2. In developing a reproducible way to load semiconductor dots into the accessible void spaces of zeolite host lattices, the direct information of the occupancy of different cages in a zeolite is important.
As one of sensitive microprobe of voids on nanometer scale, positron annihilation has been used to characterize zeolite-based materialsC2-e1. In zeolite materials positrons can be slowed down internally and form para-or otho-positronium p-Ps,o-Ps. In this paper we report on the results of positron annihilation in ion-exchanged zeolite Y and CdS loaded zeolite Y. We found that T a is responsible to Ps annililation in 0-cage and positron annihilation may be a very interesting technique to characterize intrazeolite materiala.
The NaY powders were soaked i n Cd N08 , solution of different concentrations. The pH values of the solutions were adjusted to 6. The concentrations were selected i n that way so that the ratio of the total amounts of Cd N08 , in the solutions over the weights of NaY zeolite powders are 0.
After being pre-heated, the powders were sintered at 4OOC in O1 for 12 hours. In order to load CdS molecules into the zeolite cages, gaseous H2S was used. The loading process lasted about 2 hours, the colours of the zeolites changed from white at the begining to yellow progressively. Positron lifetimes were measured in a fast timing system with a time resolution of -3OOps. In order to determine the lifetime values with a reasonable accuracy, two time windows were chosen: 0.
The longest lifetime was obtained by 3-component free fitting of the lifetime spectra taken with O. Typically T is about 0. Temples and scholars of divine magic are at a loss to explain a curse that has affected the entire region, and possibly the entire world. The cause is a necromantic artifact called the Soulmonger, which is located somewhere in chult, a mysterious peninsula far to the south, ringed with mountains and choked with rain forests.
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