Laboratory Studies of Sol--Gel Processes at the Oak Ridge National Laboratory.

McBride, J

doi:10.2172/4197859

Cited by 5 publications

(2 citation statements)

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“…4), and diffraction patterns of the crystalline material again correspond to the cubic Pu0 2 fluorite structure [12]. There was no indication of a definite crystalline hydroxide such as Pu (OH) 4 . This is true over a wide range of precipitation conditions, and it indicates that the initial hydroxide-precipitated material from Pu (IV) nitrate is plutonium polymer particles that are not colloidally dispersed.…”

Section: Particle Nature Of Plutonium Polymermentioning

confidence: 99%

“…Over the course of several years, a number of sol-gel processes were developed at Oak Ridge National Laboratory (ORNL) to produce dense oxide and carbide forms of a variety of metallic elements [1][2][3][4][5][6][7][8][9][10]. The primary emphasis involved sol-gel processes to produce improved fuels for breeder reactors (especially liquid-metal-cooled fast breeders) and high-temperature gas-cooled reactors (HTGRs).…”

Section: Introductionmentioning

confidence: 99%

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The Chemistry of Plutonium in Sol-Gel Processes

Lloyd

Haire

1978

Radiochimica Acta

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Plutonium /Plutonium polymer/Colloids /Sols/Sol-gel process/ Nitrates /DenitrationSummary Studies of plutonium chemical behavior conducted in conjunction with plutonia sol-gel process development at ORNL are described. The colloidal solutions produced consist of "Pu(IV) polymer," and this is therefore the study of polymeric plutonium behavior. Spectrophotometric, electron diffraction, and electron microscopy studies, in addition to specific studies that were concerned with the colloidal behavior of Pu(IV) polymer, indicate several characteristics of polymer that are not generally recognized. The particle nature of Pu(IV) polymer indicated by electron microscopy, the amorphous-crystalline characteristics of primary polymer particles demonstrated by electron diffraction, and the reversible and irreversible aggregation of the primary particles shown by spectrophotometric techniques present a useful view of the nature of Pu(IV) polymer that has been helpful in solving orunderstanding various types of processing problems involving plutonium hydrolytic behavior. The colloidal characteristics of Pu (IV) polymer and crystallite growth of primary polymer particles by thermal denitration are also described.

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Section: Particle Nature Of Plutonium Polymermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Chemistry of Plutonium in Sol-Gel Processes

Lloyd

Haire

1978

Radiochimica Acta

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Lanthanum cobalt oxide oxidation catalysts derived from mixed hydroxide precursors

Barnard

Föger

Turney

et al. 1990

Journal of Catalysis

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Kinetics of the Graphite‐Uranium Dioxide Reaction from 1400° to 1756°C

Lindemer

Allen

Leitnaker

1969

Journal of the American Ceramic Society

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The reaction of microspheres of UOz with graphite was studied from 1400" to 1756°C. When a spherically symmetrical layer of carbide was produced around the UO, core, only UC, was formed, and the diffusion of oxygen through this layer was rate-controlling. The Arrhenius relation for this system is h,,=21.0 exp( -90,00O/RT) cm'/s The reaction of a geometrically nonsymmetrical configuration of UO, and UC, was also studied. Comparison of the reactions in the symmetrical and nonsymmetrical systems demonstrated that the kinetic behavior of the two systems is quite different and that the conversion in the nonsymmetrical system was 2 to 5 times faster. The importance of these observations to kinetic results reported in the literature for analogous systems is discussed.

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Laboratory Studies of Sol--Gel Processes at the Oak Ridge National Laboratory.

Cited by 5 publications

References 1 publication

The Chemistry of Plutonium in Sol-Gel Processes

The Chemistry of Plutonium in Sol-Gel Processes

Lanthanum cobalt oxide oxidation catalysts derived from mixed hydroxide precursors

Kinetics of the Graphite‐Uranium Dioxide Reaction from 1400° to 1756°C

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