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Title: In situ observation of radiation induced amorphization of crystals with apatite structure

Abstract

Temperature dependence of amorphization doses for 1.5 MeV Kr ion-irradiated Ca{sub 10}(PO{sub 4}){sub 6}F{sub 2} and Ca{sub 2}La{sub 8}(SiO{sub 4}){sub 6}O{sub 2} were studied with in situ transmission electron microscopy. At low temperatures, Ca{sub 10}(PO{sub 4}){sub 6}F{sub 2} became amorphized at lower dose than Ca{sub 2}La{sub 8}(SiO{sub 4}){sub 6}O{sub 2}. However, the critical amorphization dose increased much more rapidly for the former above 350 K than the latter. At 475 K, Ca{sub 10}(PO{sub 4}){sub 6}F{sub 2} required nearly five times of higher dose to become amorphous than Ca{sub 10}La{sub 8}(SiO{sub 4}){sub 6}O{sub 2}. Based on the dose-temperature curves, activation energies for the crystal structure recovery process were determined to be 0.07 eV for Ca{sub 10}(PO{sub 4}){sub 6}F{sub 2} and 0.13 eV for Ca{sub 2}La{sub 8}(SiO{sub 4}){sub 6}O{sub 2} respectively. The lower critical amorphization dose and lower activation energy for recovery of Ca{sub 10}(PO{sub 4}){sub 6}F{sub 2} are attributed to the weaker P-O bond and the higher fluorine mobility in the structure.

Authors:
;  [1];  [2];  [3];  [4]
  1. New Mexico Univ., Albuquerque, NM (United States). Dept. of Earth and Planetary Sciences
  2. National Science Foundation, Washington, DC (United States). Div. of Earth Sciences
  3. Pacific Northwest Lab., Richland, WA (United States)
  4. Miami Univ., Oxford, OH (United States). Dept. of Geology
Publication Date:
Research Org.:
Pacific Northwest Lab., Richland, WA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10177639
Report Number(s):
PNL-SA-22730; CONF-930405-35
ON: DE93018450; TRN: 93:018954
DOE Contract Number:  
AC06-76RL01830; FG04-84ER45099
Resource Type:
Conference
Resource Relation:
Conference: Spring meeting of the Materials Research Society,San Francisco, CA (United States),12-16 Apr 1993; Other Information: PBD: Jun 1993
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM PHOSPHATES; PHYSICAL RADIATION EFFECTS; CALCIUM FLUORIDES; CALCIUM SILICATES; LANTHANUM SILICATES; CALCIUM OXIDES; LANTHANUM OXIDES; KRYPTON IONS; ION BEAMS; MEV RANGE 01-10; VITRIFICATION; AMORPHOUS STATE; TRANSMISSION ELECTRON MICROSCOPY; RADIATION DOSES; ACTIVATION ENERGY; 360605; RADIATION EFFECTS

Citation Formats

Wang, L.M., Ewing, R.C., Cameron, M., Weber, W.J., and Crowley, K.D. In situ observation of radiation induced amorphization of crystals with apatite structure. United States: N. p., 1993. Web.
Wang, L.M., Ewing, R.C., Cameron, M., Weber, W.J., & Crowley, K.D. In situ observation of radiation induced amorphization of crystals with apatite structure. United States.
Wang, L.M., Ewing, R.C., Cameron, M., Weber, W.J., and Crowley, K.D. Tue . "In situ observation of radiation induced amorphization of crystals with apatite structure". United States. https://www.osti.gov/servlets/purl/10177639.
@article{osti_10177639,
title = {In situ observation of radiation induced amorphization of crystals with apatite structure},
author = {Wang, L.M. and Ewing, R.C. and Cameron, M. and Weber, W.J. and Crowley, K.D.},
abstractNote = {Temperature dependence of amorphization doses for 1.5 MeV Kr ion-irradiated Ca{sub 10}(PO{sub 4}){sub 6}F{sub 2} and Ca{sub 2}La{sub 8}(SiO{sub 4}){sub 6}O{sub 2} were studied with in situ transmission electron microscopy. At low temperatures, Ca{sub 10}(PO{sub 4}){sub 6}F{sub 2} became amorphized at lower dose than Ca{sub 2}La{sub 8}(SiO{sub 4}){sub 6}O{sub 2}. However, the critical amorphization dose increased much more rapidly for the former above 350 K than the latter. At 475 K, Ca{sub 10}(PO{sub 4}){sub 6}F{sub 2} required nearly five times of higher dose to become amorphous than Ca{sub 10}La{sub 8}(SiO{sub 4}){sub 6}O{sub 2}. Based on the dose-temperature curves, activation energies for the crystal structure recovery process were determined to be 0.07 eV for Ca{sub 10}(PO{sub 4}){sub 6}F{sub 2} and 0.13 eV for Ca{sub 2}La{sub 8}(SiO{sub 4}){sub 6}O{sub 2} respectively. The lower critical amorphization dose and lower activation energy for recovery of Ca{sub 10}(PO{sub 4}){sub 6}F{sub 2} are attributed to the weaker P-O bond and the higher fluorine mobility in the structure.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {6}
}

Conference:
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