Synthesis and characterization of several cesium zirconates and a study of their relevance to fission-product chemistry
Investigations of the reaction of Csl with excess ZrO/sub 2/ in various containers at 400-850/sup 0/C have successfully demonstrated the formation of Zrl/sub 4/ and Cs/sub 2/ZrO/sub 3/ in low yields (< 35%) based upon the analytical evidence from X-ray fluorescence and atomic absorption techniques. To further investigate the chemistry, macroscopic amounts of the cesium zirconates have been synthesized from reactions of Cs-Zr-O/sub 2/ in silver crucibles or of Cs-CsO/sub 2/-ZrO/sub 2/ and CsO/sub 2/-Zr in welded silver tubing at 600-750/sup 0/C for one to two weeks. These reactions have produced four new compounds: Cs/sub 2/ZrO/sub 3/ and Cs/sub 4/ZrO/sub 4/ each in 95-100% yield, and two evidently ZrO/sub 2/-richer cesium zirconates of unknown composition and structure in 40-50% yield. The crystal structures of the first two phases have been solved by single crystal methods, and the crystal structures are reported. The thermal stabilities of Cs/sub 2/ZrO/sub 3/ and Cs/sub 4/ZrO/sub 4/ have been investigated both in vacuo and in sealed silver containers. The compounds Cs/sub 2/ZrO/sub 3/ and Cs/sub 4/ZrO/sub 4/ decompose into Cs/sub 2/O and ZrO/sub 2/ or Cs/sub 2/ZrO/sub 3/ at near 915/sup 0/C and 260-280/sup 0/C under high vacuum, whereas in sealed silver containers they are stable to above 900/sup 0/C and to 730 +/- 20/sup 0/C, respectively. The relevance of the formation and properties of these zirconates to the distribution of fission products is also discussed.
- Research Organization:
- Iowa State Univ. of Science and Technology, Ames (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5571937
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CESIUM COMPOUNDS
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
STABILITY
TEMPERATURE EFFECTS
ALKALI METAL COMPOUNDS
SYNTHESIS
400201* - Chemical & Physicochemical Properties
052002 - Nuclear Fuels- Waste Disposal & Storage