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Your search keyword '"Omerašević, Mia"' showing total 2 results
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2 results on '"Omerašević, Mia"'

1. Primena faznih transformacija cezijum-izmenjenih zeolita za dobijanje stabilnih cezijum-aluminosilikatnih kristalnih struktura, CsAISi5O12 i CsAISi2O6 - potencijalnih matrica za imobilizaciju jona cezijuma

Author

Omerašević, Mia, Dondur, Vera, Matović, Ljiljana, Vukelić, Nikola, and Nedić-Vasiljević, Bojana

Subjects
jonska izmena, sintering, toplo presovanje, phase transformation, polucit, CAS phase, fazne transformacije, ion exchange, Cs-clinoptilolite, Na/Cs-LTA, sinterovanje, hot pressing, Cs-klinoptilolit, pollucite, CAS faza
Abstract

Ispitan je mehanizam visoko temperaturskih faznih transformacija cezijum (Cs) izmenjenih zeolita tipa LTA i klinoptilolita (CLI). Analizirane su osobine dobijenih faza u pogledu termalne stabilnosti i otpornosti na luţenje jona cezijuma. Rezultati pokazuju da su dobijene stabilne kristalne alumosilikatne strukture polucita (CsAlSi2O6) i faze CAS (CsAlSi5O12) koje mogu biti matrice za imobilizaciju Cs jona... The mechanism of high-temperature phase transformation of cesium (Cs) exchanged zeolites such as LTA and clinoptilolite (CLI) was investigated. Thermal stability of obtained phases and their resistance to Cs ion leaching was also analysed. It was shown that the obtained stable, crystalline alumosilicate structures of pollucite (CsAlSi2O6) and CAS phase (CsAlSi5O12) can be used as matrices for Cs ion immobilisation...

Published
2017

2. Transformation of Cs-exchanged clinoptilolite to CsAlSi5O12 by hot-pressing.

Author

Omerašević, Mia, Ružić, Jovana, Vasiljević, Bojana Nedić, Baščarević, Zvezdana, Bučevac, Dušan, Orlić, Jovana, and Matović, Ljiljana

Subjects
*CESIUM compounds, *ION exchange (Chemistry), *CLINOPTILOLITE, *HOT pressing, *AMORPHIZATION, *X-ray diffraction measurement, *FOURIER transform infrared spectroscopy
Abstract

Dense CsAlSi 5 O 12 was successfully obtained by hot pressing of Cs-exchanged clinoptilolite at 900 °C. Simultaneous application of high temperature and mechanical pressure allowed formation of CsAlSi 5 O 12 at temperature considerably lower than 1150 °C which was the lowest reported temperature of CsAlSi 5 O 12 formation in pressureless sintered Cs-exchanged clinoptilolite. CsAlSi 5 O 12 formation was preceded by complete amorphisation of Cs-exchanged clinoptilolite in temperature range between 700 and 900 °C. Bearing in mind that clinoptilolite possesses high affinity for Cs cation it is believed that hot pressing of Cs-exchanged clinoptilolite might be an efficient way to immobilize radioactive Cs by its incorporation into crystal lattice of stable CsAlSi 5 O 12 . The samples sintered at 950 °C had relative density about 84% of theoretical density and open porosity of only 6% which is expected to result in low Cs leaching rate. [ABSTRACT FROM AUTHOR]

Published
2017
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