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

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6784647

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

---

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., TN (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6784647
• Report Number(s): CONF-900623-11; ON: DE90012294
• Country of Publication: United States
• Language: English

Related Subjects

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