Irradiation-induced amorphization of Ca[sub 2]La[sub 8](SiO[sub 4])[sub 6]O[sub 2] single crystals
- Pacific Northwest Lab., Richland, WA (United States)
- New Mexico Univ., Albuquerque, NM (United States). Dept. of Geology
Single crystals of Ca[sub 2]La[sub 8](SiO[sub 4])[sub 6]O[sub 2] were irradiated with 1.5 MeV Xe[sup +], 1.5 MeV Kr[sup +], 1.0 MeV Ar[sup +], and 0.8 MeV Ne[sup +] ions to investigate the effects of recoil-energy spectrum, temperature, and crystallographic orientation on irradiation-induced amorphization. The irradiations were carried out using the HVEM-Tandem Facility at Argonne National Laboratory. The structural changes and the ion fluence for complete amorphization in the electron transparent thickness of the specimens were determined by in situ transmission electron microscopy. The displacement dose determined for complete amorphization was approximately 0.6 dpa for the Xe[sup +], Kr[sup +], and Ar[sup +] ion irradiations, but increased to 1.5 dpa for the Ne[sup +] ion irradiations, which may reflect an effect of lower recoil energies. The ion fluence for complete amorphization increased exponentially with temperature over the range from 25 to 400[degree]C. Amorphization was not observed at 500[degree]C. The activation energy associated with this simultaneous recrystallization process was estimated to be 0.13 eV, and the critical amorphization temperature was estimated to be 438[degree]C.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 7122729
- Report Number(s):
- PNL-SA-21128; CONF-921101-20; ON: DE93004835
- Resource Relation:
- Conference: 16. Material Research Society international symposium on the scientific basis for nuclear waste management fall meeting, Boston, MA (United States), 30 Nov - 5 Dec 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALCIUM SILICATES
PHYSICAL RADIATION EFFECTS
LANTHANUM SILICATES
AMORPHOUS STATE
ARGON IONS
CALCIUM OXIDES
DISPLACEMENT RATES
ION BEAMS
KEV RANGE 100-1000
KRYPTON IONS
LANTHANUM OXIDES
MEV RANGE 01-10
MONOCRYSTALS
NEON IONS
RADIATION DOSES
TEMPERATURE DEPENDENCE
VITRIFICATION
XENON IONS
ALKALINE EARTH METAL COMPOUNDS
BEAMS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
CRYSTALS
DOSES
ENERGY RANGE
IONS
KEV RANGE
LANTHANUM COMPOUNDS
MEV RANGE
OXIDES
OXYGEN COMPOUNDS
RADIATION EFFECTS
RARE EARTH COMPOUNDS
SILICATES
SILICON COMPOUNDS
360605* - Materials- Radiation Effects