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Title: Preparation of monophasic [NZP] radiophases: Potential host matrices for the immobilization of reprocessed commercial high-level wastes

Abstract

The compositional flexibility of the sodium zirconium phosphate (NaZr{sub 2}(PO{sub 4}){sub 3}) structure has been exploited in the design of monophasic radiophases capable of immobilizing the most common cations associated with reprocessed high-level commercial waste streams. Highly crystalline, monophasic members of the NaZr{sub 2}(PO{sub 4}){sub 3} structural family ([NZP]) have been prepared with conventional processing methods and equipment. These radiophases were tailored to accommodate 10--20 wt% modified PW-4b simulated calcine as single phases isostructural with NaZr{sub 2}(PO{sub 4}){sub 3}. To meet the challenge of designing monophasic materials capable of accommodating the chemical complexity of PW-4b, an ionic substitution scheme based on crystal chemical principles was developed. The radiophases were prepared with inexpensive, inorganic precursors and a solution sol-gel method; these materials were heat treated and/or sintered under a variety of conditions to determine the optimum conditions for single phase [NZP] formation. X-ray powder diffraction provided valuable information that was used to assess the suitability of the ionic substitution model developed in this investigation. The results of this investigation suggest that monophasic [NZP] radiophases capable of accommodating 10--20 wt% modified PW-4b simulated calcine may be continuously processed with conventional ceramic processing methods and equipment. Moreover, the relatively low temperatures involved andmore » the reproducibility of the process make [NZP] radiophases economically attractive hosts for radioactive and heavy metal industrial wastes.« less

Authors:
;  [1];  [2]
  1. Los Alamos National Lab., NM (United States)
  2. Pennsylvania State Univ., University Park, PA (United States). Intercollege Materials Research Lab.
Publication Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
572093
Report Number(s):
CONF-961202-
Journal ID: ISSN 0275-0012; TRN: 98:003716
Resource Type:
Conference
Resource Relation:
Conference: 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996; Other Information: PBD: 1997; Related Information: Is Part Of Scientific basis for nuclear waste management XX; Gray, W.J. [ed.] [Pacific Northwest National Lab., Richland, WA (United States)]; Triay, I.R. [ed.] [Los Alamos National Lab., NM (United States)]; PB: 1389 p.; Materials Research Society symposium proceedings, Volume 465
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 05 NUCLEAR FUELS; WASTE FORMS; SOL-GEL PROCESS; HIGH-LEVEL RADIOACTIVE WASTES; SODIUM PHOSPHATES; ZIRCONIUM PHOSPHATES; CRYSTAL STRUCTURE; MATRIX MATERIALS; X-RAY DIFFRACTION

Citation Formats

Hawkins, H T, Guthrie, Jr, G D, and Scheetz, B E. Preparation of monophasic [NZP] radiophases: Potential host matrices for the immobilization of reprocessed commercial high-level wastes. United States: N. p., 1997. Web.
Hawkins, H T, Guthrie, Jr, G D, & Scheetz, B E. Preparation of monophasic [NZP] radiophases: Potential host matrices for the immobilization of reprocessed commercial high-level wastes. United States.
Hawkins, H T, Guthrie, Jr, G D, and Scheetz, B E. 1997. "Preparation of monophasic [NZP] radiophases: Potential host matrices for the immobilization of reprocessed commercial high-level wastes". United States.
@article{osti_572093,
title = {Preparation of monophasic [NZP] radiophases: Potential host matrices for the immobilization of reprocessed commercial high-level wastes},
author = {Hawkins, H T and Guthrie, Jr, G D and Scheetz, B E},
abstractNote = {The compositional flexibility of the sodium zirconium phosphate (NaZr{sub 2}(PO{sub 4}){sub 3}) structure has been exploited in the design of monophasic radiophases capable of immobilizing the most common cations associated with reprocessed high-level commercial waste streams. Highly crystalline, monophasic members of the NaZr{sub 2}(PO{sub 4}){sub 3} structural family ([NZP]) have been prepared with conventional processing methods and equipment. These radiophases were tailored to accommodate 10--20 wt% modified PW-4b simulated calcine as single phases isostructural with NaZr{sub 2}(PO{sub 4}){sub 3}. To meet the challenge of designing monophasic materials capable of accommodating the chemical complexity of PW-4b, an ionic substitution scheme based on crystal chemical principles was developed. The radiophases were prepared with inexpensive, inorganic precursors and a solution sol-gel method; these materials were heat treated and/or sintered under a variety of conditions to determine the optimum conditions for single phase [NZP] formation. X-ray powder diffraction provided valuable information that was used to assess the suitability of the ionic substitution model developed in this investigation. The results of this investigation suggest that monophasic [NZP] radiophases capable of accommodating 10--20 wt% modified PW-4b simulated calcine may be continuously processed with conventional ceramic processing methods and equipment. Moreover, the relatively low temperatures involved and the reproducibility of the process make [NZP] radiophases economically attractive hosts for radioactive and heavy metal industrial wastes.},
doi = {},
url = {https://www.osti.gov/biblio/572093}, journal = {},
issn = {0275-0012},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {12}
}

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