Incorporation of cesium ion from CsNO3 into NH4Zr2(PO4)3 studied by TG-IR spectroscopy and powder XRD |
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| Authors: | N Nomura Y -H Zhang T Oi |
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| Institution: | (1) Department of Chemistry, Sophia University, 7-1 Kioicho, Chiyodaku, Tokyo 102-8554, Japan |
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| Abstract: | The incorporation mechanism of Cs+ ions from CsNO3 into NH4Zr2(PO4)3 was studied on a mixture of CsNO3 and NH4Zr2(PO4)3 by powder X-ray diffraction analysis and by monitoring off-gases released from the mixture upon heating with a thermogravimetry
analyzer connected to an infrared spectrometer. With increasing temperature, the decomposition of CsNO3 first started, followed by the conversion of NH4Zr2(PO4)3 to HZr2(PO4)3 with the release of NH3. At around 500°C, the Cs Zr2(PO4)3 phase started to appear as a result of the H+/Cs+ ion exchange. No Cs+ ion loss was observed at thermal treatment temperatures of 900°C and lower. |
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| Keywords: | HZr2(PO4)3 immobilization of cesium NH4Zr2(PO4)3 radioactive cesium TG analyzer connected to IR spectrometer |
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