Oxidation studies of yttrium implanted copper, molybdenum and tantalum using high-energy resonant helium backscattering

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

OSTI ID:6419704

Kramer, K M ^[1]; Tesmer, J R; Nastasi, M ^[2]

---

1. Michigan Technological Univ., Houghton, MI (USA)
2. Los Alamos National Lab., NM (USA)

The 16O({alpha},{alpha})16O resonance at 8.8 MeV was used to determine the oxidation rates of Y implanted Cu, Mo and Ta. At back angles this resonance has an uniform cross section of {approx} 25 times the coulomb cross section over an energy range of {approx} 0.6 MeV, allowing the surface oxidation of metals to be easily determined without the necessity of weighing the samples. Oxidations were made at 200{degree}C, 400{degree}C and 500{degree}C for Cu, Mo and Ta respectively and for times ranging from 10 min to 10 h. At short times the oxidation is enhanced in the Y implanted materials as compared to unimplanted materials. However, as the oxidation times increase the oxidation rate in the implanted materials fall, and in the case of Cu and Ta the total amount of oxygen in the implanted samples eventually becomes lower than that of the unimplanted samples. In all cases Y implantation strongly effects the oxidation process. For Ta and Cu retardation of grain boundary oxidation occurs. For Mo, implantation produces a discrete oxide layer which grows in a layer-by-layer manner. These data indicate that the Y-Cu and the Y-Ta oxides are more passivating than their unimplanted counterparts.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE/AD
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6419704
• Report Number(s): LA-UR-90-3448; CONF-900936-16; ON: DE91002345; TRN: 90-036272
• Resource Relation: Conference: 7. international conference on ion beam modification of materials, Knoxville, TN (USA), 9-14 Sep 1990
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
COPPER
OXIDATION
MOLYBDENUM
TANTALUM
YTTRIUM IONS
ION IMPLANTATION
BACKSCATTERING
HELIUM
SURFACE COATING
CHARGED PARTICLES
CHEMICAL REACTIONS
DEPOSITION
ELEMENTS
FLUIDS
GASES
IONS
METALS
NONMETALS
RARE GASES
SCATTERING
TRANSITION ELEMENTS
656003* - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)
360101 - Metals & Alloys- Preparation & Fabrication