Salt-occluded zeolite waste forms: Crystal structures and transformability

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Neutron diffraction studies of salt-occluded zeolite and zeolite/glass composite samples, simulating nuclear waste forms loaded with fission products, have revealed complex structures, with cations assuming the dual roles of charge compensation and occlusion (cluster formation). These clusters roughly fill the 6--8 {angstrom} diameter pores of the zeolites. Samples are prepared by equilibrating zeolite-A with complex molten Li, K, Cs, Sr, Ba, Y chloride salts, with compositions representative of anticipated waste systems. Samples prepared using zeolite 4A (which contains exclusively sodium cations) as starting material are observed to transform to sodalite, a denser aluminosilicate framework structure, while those prepared using zeolite ... continued below

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8 p.

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Richardson, J.W. Jr. December 31, 1996.

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  • Richardson, J.W. Jr. Argonne National Lab., IL (United States). Intense Pulsed Neutron Source Div.

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Neutron diffraction studies of salt-occluded zeolite and zeolite/glass composite samples, simulating nuclear waste forms loaded with fission products, have revealed complex structures, with cations assuming the dual roles of charge compensation and occlusion (cluster formation). These clusters roughly fill the 6--8 {angstrom} diameter pores of the zeolites. Samples are prepared by equilibrating zeolite-A with complex molten Li, K, Cs, Sr, Ba, Y chloride salts, with compositions representative of anticipated waste systems. Samples prepared using zeolite 4A (which contains exclusively sodium cations) as starting material are observed to transform to sodalite, a denser aluminosilicate framework structure, while those prepared using zeolite 5A (sodium and calcium ions) more readily retain the zeolite-A structure. Because the sodalite framework pores are much smaller than those of zeolite-A, clusters are smaller and more rigorously confined, with a correspondingly lower capacity for waste containment. Details of the sodalite structures resulting from transformation of zeolite-A depend upon the precise composition of the original mixture. The enhanced resistance of salt-occluded zeolites prepared from zeolite 5A to sodalite transformation is thought to be related to differences in the complex chloride clusters present in these zeolite mixtures. Data relating processing conditions to resulting zeolite composition and structure can be used in the selection of processing parameters which lead to optimal waste forms.

Physical Description

8 p.

Notes

INIS; OSTI as DE97053027

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  • 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996

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  • Other: DE97053027
  • Report No.: ANL/RE/CP--93201
  • Report No.: CONF-961202--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 541788
  • Archival Resource Key: ark:/67531/metadc691562

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  • December 31, 1996

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 16, 2015, 3:51 p.m.

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Richardson, J.W. Jr. Salt-occluded zeolite waste forms: Crystal structures and transformability, article, December 31, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc691562/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.