Electron-irradiation-induced crystallization of amorphous orthophosphates

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Amorphous LaPO{sub 4}, EuPO{sub 4}, GdPO{sub 4}, ScPO{sub 4}, and fluorapatite [Ca{sub 5}(PO{sub 4}){sub 3}F] were irradiated by electron beam in a TEM. Irradiations were done at -150 to 300 C, 80 to 200 keV, and current densities from 0.3 to 16 A/cm{sup 2}. In all cases, the materials crystallized to form a randomly oriented polycrystalline assemblage. Crystallization is driven dominantly by inelastic processes, although ballistic collisions with target nuclei can be important above 175 keV, particularly in apatite. Using a high current density, crystallization is so fast that continuous lines of crystallites can be ``drawn`` on the amorphous matrix.

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6 p.

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Meldrum, A.; Ewing, R.C. & Boatner, L.A. December 1, 1996.

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Amorphous LaPO{sub 4}, EuPO{sub 4}, GdPO{sub 4}, ScPO{sub 4}, and fluorapatite [Ca{sub 5}(PO{sub 4}){sub 3}F] were irradiated by electron beam in a TEM. Irradiations were done at -150 to 300 C, 80 to 200 keV, and current densities from 0.3 to 16 A/cm{sup 2}. In all cases, the materials crystallized to form a randomly oriented polycrystalline assemblage. Crystallization is driven dominantly by inelastic processes, although ballistic collisions with target nuclei can be important above 175 keV, particularly in apatite. Using a high current density, crystallization is so fast that continuous lines of crystallites can be ``drawn`` on the amorphous matrix.

Physical Description

6 p.

Notes

INIS; OSTI as DE97001741

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  • 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996

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  • Other: DE97001741
  • Report No.: CONF-961202--10
  • Grant Number: AC05-96OR22464;FG03-93ER45498
  • Office of Scientific & Technical Information Report Number: 435070
  • Archival Resource Key: ark:/67531/metadc682873

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  • December 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Jan. 19, 2016, 1:03 p.m.

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Meldrum, A.; Ewing, R.C. & Boatner, L.A. Electron-irradiation-induced crystallization of amorphous orthophosphates, article, December 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc682873/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.