The effect of crystal orientation on damage accumulation in chromium-implanted Al sub 2 O sub 3

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6784647

O'Hern, M E ^[1]; Romana, L J; McHargue, C J; White, C W ^[2]; McCallum, J C ^[3]

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1. Nano Instruments, Inc., Knoxville, TN (USA)
2. Oak Ridge National Lab., TN (USA)
3. Western Ontario Univ., London, ON (Canada)

Chromium-implantation of single crystal aluminium oxide (Al{sub 2}O{sub 3}) has been shown to be anisotropic with respect to damage accumulation. Ultra-low load indentation and Rutherford Backscattering Spectroscopy (RBS) have been used to demonstrate the dependence of radiation damage on fluence and crystal orientation. Single crystal Al{sub 2}O{sub 3} specimens of c-axis ((0001) normal to the surface) and a-axis ((1120) normal to the surface) orientations were ion-implanted simultaneously and found to possess different near-surface mechanical properties. Subsequent RBS-ion channeling examination indicated different amounts of disorder in both the aluminum and oxygen sublattices for the two orientations. These results imply a higher amorphization threshold in terms of implantation fluence for the a-axis oriented samples. 15 refs., 6 figs.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6784647
• Report Number(s): CONF-900623-11; ON: DE90012294; TRN: 90-021133
• Resource Relation: Conference: 15. symposium on effects of radiation on materials, Nashville, TN (USA), 17-21 Jun 1990
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM OXIDES
PHYSICAL RADIATION EFFECTS
CHROMIUM IONS
HARDNESS
ION CHANNELING
ION IMPLANTATION
MECHANICAL PROPERTIES
SAPPHIRE
SPECTROSCOPY
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHANNELING
CHARGED PARTICLES
CORUNDUM
IONS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
RADIATION EFFECTS
360206* - Ceramics
Cermets
& Refractories- Radiation Effects
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties
656003 - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)