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}

Technical Report · Wed Sep 01 04:00:00 EDT 1993

DOI:https://doi.org/10.2172/10109471· OSTI ID:10109471

Weber, W J ^[1]; Wang, L M ^[2]

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1. Pacific Northwest Lab., Richland, WA (United States)
2. 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 Lab., 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
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360605
665300
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMORPHOUS STATE
ANNEALING
ARGON IONS
CALCIUM SILICATES
CRYSTAL DEFECTS
CRYSTAL-PHASE TRANSFORMATIONS
ENERGY SPECTRA
EXPERIMENTAL DATA
INTERACTIONS BETWEEN BEAMS AND CONDENSED MATTER
KRYPTON IONS
LANTHANUM SILICATES
MONOCRYSTALS
NEON IONS
PHYSICAL RADIATION EFFECTS
RADIATION DOSES
RADIATION EFFECTS
RECOILS
TEMPERATURE DEPENDENCE
XENON IONS