New Metal Niobate and Silicotitanate Ion Exchangers: Development and Characterization
We are evaluating new metal niobate and silicotitanate ion exchangers for Cs and Sr removal and their related condensed phases as potential ceramic waste forms. The goal of the program is to provide DOE alternative materials that can exceed the solvent extraction process for removing Cs and Sr from high level wastes and technical alternatives for disposal of silicotitanate and niobate based ion exchange materials. To date we have determined the structural property relationship and thermodynamic stability of new silicotitanate and niobate based ion exchangers and their thermally converted phases. Several new phases include Na2Nb2-xMIV xO6-x(OH)x {center_dot} H2O (MIV=Ti, Zr, x=0.04 {approx} 0.4, SOMS), NaTixNb1-xO3-0.5x, Na2-xMxNb1.6Ti0.4O5.8+yx (M=Sr, Y), CsTixAl1-xSi2O6+x/2 (0 x 1), and Cc- A2TiSi6O15 (A=K, Rb, Cs) have been synthesized and characterized and results will be presented. Additionally, chemical, thermal, radiation, and thermodynamic stabilities of the new ion exchange materials and their related perovskites as potential ceramic waste forms will also be presented at the meeting.
- Research Organization:
- Arizona State University, Tempe, AZ; Pacific Northwest National Lab., Richland, WA; Sandia National Labs., Albuquerque, NM; University of California, Davis, CA (US)
- Sponsoring Organization:
- USDOE Office of Science (SC) (US)
- OSTI ID:
- 826238
- Country of Publication:
- United States
- Language:
- English
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New Metal Niobate and Silicotitanate Ion Exchangers: Development and Characterization
New Metal Niobate and Silicotitanate Ion Exchangers: Development and Characterization