In situ observation of radiation induced amorphization of crystals with apatite structure
- New Mexico Univ., Albuquerque, NM (United States). Dept. of Earth and Planetary Sciences
- National Science Foundation, Washington, DC (United States). Div. of Earth Sciences
- Pacific Northwest Lab., Richland, WA (United States)
- Miami Univ., Oxford, OH (United States). Dept. of Geology
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.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830; FG04-84ER45099
- OSTI ID:
- 10177639
- Report Number(s):
- PNL-SA-22730; CONF-930405-35; ON: DE93018450; TRN: 93:018954
- 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
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Related Subjects
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