1. Transformation of Cs-exchanged clinoptilolite to CsAlSi5O12 by hot-pressing.
- Author
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Omerašević, Mia, Ružić, Jovana, Vasiljević, Bojana Nedić, Baščarević, Zvezdana, Bučevac, Dušan, Orlić, Jovana, and Matović, Ljiljana
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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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