caa a22 4500 388021292 CHVBK 20180307124925.0 cr unu---uuuuu 161130e199801 xx s 000 0 eng 10.1557/JMR.1998.0004 doi S0884291400042412 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0004 A 133Cs magic angle spinning nuclear magnetic resonance study of cesium environments in barium hollandites and Synroc [Elektronische Daten] Barium aluminum hollandite is a major phase in Synroc, a ceramic designed for the immobilization of high-level waste (HLW) from nuclear fuel reprocessing. Radioactive cesium substitutes into the channel sites, and such hollandites give 133Cs MAS nuclear magnetic resonance (NMR) spectra consisting of a single peak at 211 ppm in the absence of paramagnetic ions. However, the peak shifts to 640 ± 30 ppm and becomes extremely broad when Ti3+ replaces Al3+ in the channel walls of the hollandite structure, apparently because of Fermi contact interaction between the Cs nucleus and the unpaired electron of Ti3+. 133Cs MAS NMR of Synroc and hollandites is very sensitive to the presence of water-soluble CsAlTiO4 which would compromise the aqueous durability of Synroc. 133Cs MAS NMR spectra of Synroc-C, hot-pressed in metal bellows at temperatures as high as 1325 °C, do not indicate significant formation of CsAlTiO4. Synroc samples loaded with Cs and Sr only were shown by MAS NMR as well as electron microscopic techniques to be capable of incorporating nearly 10 wt.% Cs before CsAlTiO4 is formed. Copyright © Materials Research Society 1998 Hartman J. S. Department of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada Vance E. R. Materials Division, Australian Nuclear Science and Technology Organisation, Menai, New South Wales 2234, Australia Power W. P. Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada Hanna J. V. CSIRO North Ryde NMR Facility, P.O. Box 52, North Ryde, New South Wales 2113, Australia Journal of Materials Research Cambridge University Press 13/1(1998-01), 22-27 0884-2914 13:1<22 1998 13 JMR https://doi.org/10.1557/JMR.1998.0004 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0004 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hartman J. S. Department of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada NATIONALLICENCE 700 1- Vance E. R. Materials Division, Australian Nuclear Science and Technology Organisation, Menai, New South Wales 2234, Australia NATIONALLICENCE 700 1- Power W. P. Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada NATIONALLICENCE 700 1- Hanna J. V. CSIRO North Ryde NMR Facility, P.O. Box 52, North Ryde, New South Wales 2113, Australia NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/1(1998-01), 22-27 0884-2914 13:1<22 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge