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Crystal-chemical and structural char...

Li, Yaping.

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Crystal-chemical and structural characterization of selected uranyl minerals and synthetic phases of environmental importance.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Crystal-chemical and structural characterization of selected uranyl minerals and synthetic phases of environmental importance./
作者:	Li, Yaping.
面頁冊數:	394 p.
附註:	Director: Peter C. Burns.
Contained By:	Dissertation Abstracts International63-01B.
標題:	Engineering, Environmental. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3038957
ISBN:	0493519378

Crystal-chemical and structural characterization of selected uranyl minerals and synthetic phases of environmental importance.
Li, Yaping.

Crystal-chemical and structural characterization of selected uranyl minerals and synthetic phases of environmental importance. - 394 p.

Director: Peter C. Burns.

Thesis (Ph.D.)--University of Notre Dame, 2002.

The crystal-chemistry and crystal structures of uranyl minerals have not yet been sufficiently characterized, but knowledge of uranyl phases is crucial to evaluate the long-term performance of spent nuclear fuel in a proposed geological repository. A total of forty-eight single crystal structures including uranyl minerals and synthetic U<super>6+</super> phases were studied from data collected using Mo <italic>K</italic>α X-radiation and a Bruker CCD-based detector, in combination with other analytical tools.

ISBN: 0493519378Subjects--Topical Terms:

783782
Engineering, Environmental.

Crystal-chemical and structural characterization of selected uranyl minerals and synthetic phases of environmental importance.
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245 1 0 $a Crystal-chemical and structural characterization of selected uranyl minerals and synthetic phases of environmental importance.
300 $a 394 p.
500 $a Director: Peter C. Burns.
500 $a Source: Dissertation Abstracts International, Volume: 63-01, Section: B, page: 0139.
502 $a Thesis (Ph.D.)--University of Notre Dame, 2002.
520 $a The crystal-chemistry and crystal structures of uranyl minerals have not yet been sufficiently characterized, but knowledge of uranyl phases is crucial to evaluate the long-term performance of spent nuclear fuel in a proposed geological repository. A total of forty-eight single crystal structures including uranyl minerals and synthetic U<super>6+</super> phases were studied from data collected using Mo <italic>K</italic>α X-radiation and a Bruker CCD-based detector, in combination with other analytical tools.
520 $a A variety of uranyl oxide hydrates, uranyl carbonates and uranyl silicated were investigated. Research concerning Pb uranyl oxide hydrate minerals focused mainly on the elucidation of the charge balance mechanism that is responsible for the large variation of interlayer Pb<super>2+</super> contents in curite and fourmarierite. Presented here also is a structure refinement of an orange crystal of richetite. Five new layered Pb-free uranyl oxide hydrates were synthesized, and their structures were determined and compared with related structures. Four uranium-based framework compounds have been discovered, and the unusual structure topologies exhibited by these materials are due primarily to octahedrally-coordinated U<super>6+</super> in their structures. The structures of several uranyl carbonates were determined, including bijvoetite-(Y) with a structure based on an extraordinary (Y,REE)-bearing uranyl carbonate sheet, as well as Na4(UO2)(CO3)3, synthetic grimselite, and three new Ca uranyl carbonate compounds containing (NO 3)<super>−</super> groups or Cl<super>−</super> with structures based on the well-known uranyl tricarbonate cluster. The synthesis of uranyl silicates followed by structure analysis revealed two uranyl silicate frameworks that are found in Na4(UO2)2(Si4O 10)2(H2O)4 and Na2[(UO 2)(Si4O10)], respectively, as well as a new uranyl silicate sheet in the system <italic>R-USiOH</italic> (R = NH4 , Cs).
520 $a Many of the materials discussed in this thesis are expected to crystallize as spent nuclear fuel is subject to the oxidizing and moist environment of the proposed geological repository at Yucca Mountain. The results from this research have added to our understanding of structures of uranyl phases, and may have significant implications concerning nuclear waste management.
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