Temperature and ion-mass dependence of amorphization dose for ion beam irradiated zircon (ZrSiO[sub 4])

Conference · Tue Dec 01 00:00:00 EST 1992

OSTI ID:6670123

Wang, L M; Ewing, R C ^[1]; Weber, W J ^[2]; Eby, R K ^[3]

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1. New Mexico Univ., Albuquerque, NM (United States). Dept. of Geology
2. Pacific Northwest Lab., Richland, WA (United States)
3. Toronto Univ., ON (Canada). Dept. of Geological Sciences

The temperature dependence of amorphization dose for zircon under 1.5 MeV Kr ion irradiation has been investigated using the ANL HVEM-Tandem Facility. Three regimes were observed in the amorphization dose-temperature curve. In the first regime (15 to 300 K), the critical amorphization dose increased from 3.06 to 4.5 ions/nm[sup 2]. In the second regime (300 to 473 K), there is little change in the amorphizationdose. In the third regime (> 473 K), the amorphization dose increased exponentially to 8.3 ions/nm[sup 2] at 913 K. This temperature dependence of amorphization dose can be described by two processes with different activation energies (0.018 and 0.31 eV respectively) which are attributed to close pair recombination in the cascades at low temperatures and radiation-enhanced epitaxial recrystallization at higher temperatures. The upper temperature limit for amorphization of zircon is estimated to be 1100 K. The ion-mass dependence of the amorphization dose (in dpa) has also been discussed in terms of the energy to recoils based on data obtained from He, Ne, Ar, Kr, Xe irradiations and a [sup 238]Pu-doped sample.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: USDOE; National Aeronautic and Space Administration (NASA); USDOE, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830; FG04-84ER45099
• OSTI ID: 6670123
• Report Number(s): PNL-SA-21583; CONF-921101-95; ON: DE93007881
• 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

Related Subjects

36 MATERIALS SCIENCE
ZIRCON
PHYSICAL RADIATION EFFECTS
AMORPHOUS STATE
DOSE-RESPONSE RELATIONSHIPS
ION BEAMS
KRYPTON IONS
MEV RANGE 01-10
RADIATION DOSES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
BEAMS
CHARGED PARTICLES
DOSES
ENERGY RANGE
IONS
MEV RANGE
MINERALS
RADIATION EFFECTS
SILICATE MINERALS
TEMPERATURE RANGE
360605* - Materials- Radiation Effects