Thermal recrystallization of alpha-recoil damaged minerals of the pyrochlore structure type

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Thermal recrystallization effects (heat of recrystallization and identification of phases formed), have been determined for naturally occurring members of the pyrochlore group which have received alpha doses of up to 4 X 10{sup 16} alphas/mg. The heats of recrystallization, E{sub t}, range from 125 to 210 J/g. Release of energy decreases as a function of crystallinity (estimated on the basis of the intensity of x-ray diffraction maxima), with the fully-metamict samples approaching 210 J/g. Lower measured values (40-125 J/g) are the result of alteration of the pyrochlores. Other metamict, complex oxides with stoichiometries of ABO{sub 4} and AB{sub 2}O{sub 6} ... continued below

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23 p.

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Lumpkin, G.R.; Ewing, R.C. & Foltyn, E.M. October 1, 1985.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 12 times . More information about this report can be viewed below.

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Description

Thermal recrystallization effects (heat of recrystallization and identification of phases formed), have been determined for naturally occurring members of the pyrochlore group which have received alpha doses of up to 4 X 10{sup 16} alphas/mg. The heats of recrystallization, E{sub t}, range from 125 to 210 J/g. Release of energy decreases as a function of crystallinity (estimated on the basis of the intensity of x-ray diffraction maxima), with the fully-metamict samples approaching 210 J/g. Lower measured values (40-125 J/g) are the result of alteration of the pyrochlores. Other metamict, complex oxides with stoichiometries of ABO{sub 4} and AB{sub 2}O{sub 6} have lower heats of recrystallization (40-85 J/g), and are easily distinguished from pyrochlore group minerals. Activation energies of recrystallization, E{sub a}, range between values of 0.29 to 0.97 eV, less than those measured for Pu-doped, synthetic zirconolites.

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23 p.

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OSTI as DE97003014

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  • Other Information: PBD: 1 Oct 1985

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  • Other: DE97003014
  • Report No.: DOE/ER/45099--T1
  • Grant Number: FG04-84ER45099
  • DOI: 10.2172/437684 | External Link
  • Office of Scientific & Technical Information Report Number: 437684
  • Archival Resource Key: ark:/67531/metadc675342

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  • October 1, 1985

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 6, 2015, 8:16 p.m.

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Lumpkin, G.R.; Ewing, R.C. & Foltyn, E.M. Thermal recrystallization of alpha-recoil damaged minerals of the pyrochlore structure type, report, October 1, 1985; United States. (digital.library.unt.edu/ark:/67531/metadc675342/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.