Electrical Conductivity and Structural Properties of Cesium Iron Phosphate Glasses: A Potential Host for Vitrifying Nuclear Waste

Abstract

The thermally stimulated current (TSC) and dc conductivity for iron phosphate glasses containing up to 28 mol% Cs2O have been measured in a temperature range from 120 to 400 K. The dc conductivity and activation energy were constant and independent of Cs2O content. With increasing cesium concentration in cesium iron phosphate glasses the slowly moving cesium ions are more tightly bound to the non-bridging oxygen ions and make no measurable contribution to dc conductivity. The dc conduction in these glasses is totally electronic, controlled by electron hopping between iron ions. The ionic conduction is immeasurably small because of the low mobility of the cesium ions. This agreement is reinforced by the excellent chemical durability of the glasses, where the dissolution rate at 90oC changes little with increasing Cs2O content. Raman spectroscopy indicated that the structure of these glasses was composed of predominantly pyrophosphate (P2O7) groups, but the metaphosphate chains (PO3) also existed.

This is a preview of subscription content, access via your institution.

References

  1. 1.

    S. Lambert, D.S. Kim, Tank Waste Remediation System High-Level Feed Processability Assessment Report, Westinghouse Hanford Company, WHC-SP-1143, UC-811, Richland, WA 1994.

    Google Scholar 

  2. 2.

    D. L. Illman, Researchers take up environmental challenge at Hanford, Chem. and Eng., (1993) 21 June: 9.

    Google Scholar 

  3. 3.

    J. C. Cunnane, J.K. Bates, W. J. Ebert, X. Feng, J.J. Mazer, D.J. Wronkiewicz,. Sproull, W. L. Bourcier, B. P. McGrail, High-level nuclear.waste borosilicate glass: a compedium of characteristics. Mat. Res. Soc. Symp. Proc., 294 (1993) 225.

    CAS  Article  Google Scholar 

  4. 4.

    W. J. Gray, Volatility of some potential high-level radioactive waste forms, Rad. Waste Mngt., 1 (1980) 147.

    Google Scholar 

  5. 5.

    A. Mogus-Milankovic and D. E. Day, J. Non-Cryst. Solids, 162 (1993) 275.

    CAS  Article  Google Scholar 

  6. 6.

    R.K. Brow, D.R. Tallant, S. T. Myers and C.C. Phifer, J. Non-Cryst.Solids, 191, (1995) 45.

    CAS  Article  Google Scholar 

  7. 7.

    J. R. van Wazer, Phosphorus and Its Componds, Vol.1, Interscience New York, 1958.

  8. 8.

    G. Exarhos P. J. Miller and W. M. Risen Jr, J. Chem. Phys. 60 (1974) 4145.

    CAS  Article  Google Scholar 

  9. 9.

    G. B. Rouse Jr, P. J. Miller and W. M. Risen Jr, J. Non-Cryst. Solids, 28 (1978), 193.

    CAS  Article  Google Scholar 

  10. 10.

    D. E. Day, M. Mesko and X. Yu, Final Technical Report, Battelle Pacific, Northwest Laboratory, Contract no. 214582-A-L2, November 1994.

    Google Scholar 

  11. 11.

    B. C. Sales, L. A. Boatner, J. Non-Cryst. Solids, 79 (1986) 83.

    CAS  Article  Google Scholar 

  12. 12.

    M. G. Mesko, D. E. Day, J. Nucl. Mater., 273 (1999) 27.

    CAS  Article  Google Scholar 

  13. 13.

    H. Jain, N. L. Peterson and H. L. Downing, J. Non-Cryst. Solids, 55 (1983) 283.

    CAS  Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to K. Mogus-Milankovic.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Mogus-Milankovic, K., Furic, K. & Day, D.E. Electrical Conductivity and Structural Properties of Cesium Iron Phosphate Glasses: A Potential Host for Vitrifying Nuclear Waste. MRS Online Proceedings Library 663, 153 (2000). https://doi.org/10.1557/PROC-663-153

Download citation