Small angle neutron scattering from nanophase titanium as a function of oxidation
Nanophase titanium, prepared by the gas-condensation method both as aggregated powder and in lightly compacted discs, has been studied by conventional small angle neutron scattering, and by use of contrast variation methods. The contrast has been changed (a) isotopically, by means of deuterated/protonated solvents distilled into the specimen and (b) by progressive incremental oxidation of the Ti particles using fixed doses of low-pressure oxygen. It was shown that some evolution of the small angle pattern for lightly compacted nanophase Ti occurred over a period of several months at 300 K. Contrast matching by external solvent works well and has allowed the scattering lengths of oxidized and unoxidized specimens to be followed. The results imply that the scattering from metal and oxide can be separated under suitable conditions. The partial oxidation experiments indicate that there is both a fast and slow oxidation at 300 K. Also, during slow oxidation, high scattering length density scattering centers were formed whose number increased, but whose size remained the same at about 2 nm; these centers are tentatively assumed to be TiO/sub 2/. 5 refs., 3 figs., 1 tab.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6366423
- Report Number(s):
- CONF-881155-68; ON: DE89009865
- Resource Relation:
- Journal Volume: 132; Conference: Fall meeting of the Materials Research Society, Boston, MA, USA, 28 Nov 1988; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Small angle neutron scattering characterization of the porous structure of carbons prepared using inorganic templates
Sintering of nanophase TiO/sub 2/ at 550/degree/C
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
TITANIUM
SMALL ANGLE SCATTERING
TITANIUM OXIDES
GRAIN SIZE
MEDIUM TEMPERATURE
OXIDATION
SAMPLE PREPARATION
SCATTERING LENGTHS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DIMENSIONS
ELEMENTS
LENGTH
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SIZE
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400101* - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
360105 - Metals & Alloys- Corrosion & Erosion
360102 - Metals & Alloys- Structure & Phase Studies