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Powder diffraction of sodalite in a multiphase ceramic used to immobilize radioactive waste

Published online by Cambridge University Press:  01 March 2012

S. M. Frank ,
T. L. Barber  and
M. J. Lambregts
S. M. Frank*
Affiliation:
Argonne National Laboratory-West, P.O. Box 2528, Idaho Falls, Idaho 83403-2528
T. L. Barber
Affiliation:
Argonne National Laboratory-West, P.O. Box 2528, Idaho Falls, Idaho 83403-2528
M. J. Lambregts
Affiliation:
Argonne National Laboratory-West, P.O. Box 2528, Idaho Falls, Idaho 83403-2528
*
a)Electronic mail: [email protected]
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Abstract

The title compound, ∣Na6Li1.6K0.4Cl2∣[Al6Si6O24]‐SOD, is similar to sodalite proper, but the introduction of Li and K into the structure creates a reduction in unit-cell volume and additional collapse of the framework tetrahedra. Refinement of an X-ray powder diffraction pattern of a multiphase material yielded for sodalite a lattice parameter of 0.88427 (2) nm, an Al–O–Si bond angle of 137.9(3°), and Al–O and Si–O bond lengths of 0.1730(5) nm and 0.1620(5) nm, respectively. The angle of the unique Al–O–Si bond corresponds well with the 138° obtained by 29Si solid-state magic-angle-spinning nuclear magnetic resonance spectroscopy. This characterization is important since the compound constitutes an essential part of a radioactive waste form intended for a high-level waste repository.

Keywords

sodaliteceramic high-level waste formRietveld analysis
Type
Technical Articles
Information
Powder Diffraction , Volume 20 , Issue 3 , September 2005 , pp. 212 - 214
Copyright
Copyright © Cambridge University Press 2005

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