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Title: Irradiation-induced amorphization of Ca[sub 2]La[sub 8](SiO[sub 4])[sub 6]O[sub 2] single crystals

Abstract

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.

Authors:
 [1];  [2]
  1. Pacific Northwest Lab., Richland, WA (United States)
  2. New Mexico Univ., Albuquerque, NM (United States). Dept. of Geology
Publication Date:
Research Org.:
Pacific Northwest Lab., Richland, WA (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
7122729
Report Number(s):
PNL-SA-21128; CONF-921101-20
ON: DE93004835
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Conference
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
Subject:
36 MATERIALS SCIENCE; 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

Citation Formats

Weber, W J, and Wang, Lu-Min. Irradiation-induced amorphization of Ca[sub 2]La[sub 8](SiO[sub 4])[sub 6]O[sub 2] single crystals. United States: N. p., 1992. Web.
Weber, W J, & Wang, Lu-Min. Irradiation-induced amorphization of Ca[sub 2]La[sub 8](SiO[sub 4])[sub 6]O[sub 2] single crystals. United States.
Weber, W J, and Wang, Lu-Min. 1992. "Irradiation-induced amorphization of Ca[sub 2]La[sub 8](SiO[sub 4])[sub 6]O[sub 2] single crystals". United States. https://www.osti.gov/servlets/purl/7122729.
@article{osti_7122729,
title = {Irradiation-induced amorphization of Ca[sub 2]La[sub 8](SiO[sub 4])[sub 6]O[sub 2] single crystals},
author = {Weber, W J and Wang, Lu-Min},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/7122729}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Nov 01 00:00:00 EST 1992},
month = {Sun Nov 01 00:00:00 EST 1992}
}

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