Effect of temperature and recoil-energy spectra on irradiation-induced amorphization in Ca{sub 2}La{sub 8}(SiO{sub 4}){sub 6}O{sub 2}
- Pacific Northwest Lab., Richland, WA (United States)
- Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Earth and Planetary Sciences
Single crystals of Ca{sub 2}La{sub 8}(SiO{sub 4}){sub 6}O{sub 2} have been irradiated with different ions/energies in an in situ study of the effects of temperature and recoil-energy spectra on irradiation-induced amorphization. The dose for complete amorphization increases with temperature in two stages. The low-temperature stage (below 250 K) has an activation energy of 0.01 {plus_minus} 0.003 eV and is believed to be associated with simultaneous close-pair recombination. The high-temperature stage (above 250 K) has an activation energy of 0.13 {plus_minus} 0.02 eV and may be associated with irradiation-enhanced defect mobility. The critical temperature for amorphization increases from {approximately}360 K for 0.8 MeV Ne{sup +} to {approximately}710 K for 1.5 MeV Kr{sup +}. At 15 K, the amorphization dose is {approximately}0.36 dpa and is independent of recoil-energy spectra. The amorphization dose increases more rapidly with temperature for Ne{sup +} due to the larger fraction of mobile defects produced by the low energy recoils. The temperature dependence is similar for 1.0 MeV Ar{sup +}, 1.5 MeV Kr{sup +}, and 1.5 MeV Xe{sup +}.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 10109471
- Report Number(s):
- PNL-SA-22525; CONF-9309259-2; ON: DE94004371; TRN: 94:001481
- Resource Relation:
- Conference: Nuclear instruments and methods in physics research on radiation effects in insulators,Nagoya (Japan),5-10 Sep 1993; Other Information: PBD: Sep 1993
- Country of Publication:
- United States
- Language:
- English
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Irradiation-induced amorphization of Ca{sub 2}La{sub 8}(SiO{sub 4}){sub 6}O{sub 2} single crystals
Irradiation-induced amorphization of Ca[sub 2]La[sub 8](SiO[sub 4])[sub 6]O[sub 2] single crystals
Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CALCIUM SILICATES
PHYSICAL RADIATION EFFECTS
LANTHANUM SILICATES
MONOCRYSTALS
TEMPERATURE DEPENDENCE
ENERGY SPECTRA
AMORPHOUS STATE
CRYSTAL DEFECTS
ARGON IONS
KRYPTON IONS
XENON IONS
RECOILS
EXPERIMENTAL DATA
ANNEALING
RADIATION DOSES
CRYSTAL-PHASE TRANSFORMATIONS
NEON IONS
360605
665300
RADIATION EFFECTS
INTERACTIONS BETWEEN BEAMS AND CONDENSED MATTER