Accession Number:

AD0257035

Title:

THE MECHANISM OF OXIDE FORMATION IN THE INITIAL STAGES OF OXIDATION

Descriptive Note:

Corporate Author:

OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS

Personal Author(s):

• RAUSCH,D.W.
• MOAZED,K.L.
• FONTANA,M.G.

Report Date:

1961-04-14

Pagination or Media Count:

1.0

Abstract:

Research was conducted on the mechanism of oxide formation by means of a field emission microscope with a tungsten emission tip. Changes in the emission were observed as a result of adsorption of residual gases on the emission tip at room temperature. An improvement was made in the technique for producing field emission tubes by the development of a refractory masking material for pyrex. The high-vacuum technique was refined by the addition of a second getter to the system and the use of a H-purge at elevated temperatures to decontaminate the isolation trap. As adsorption increased the following changes were observed in emission pattern 1 a gradual decrease followed by an increase in total integrated emission intensity 2 a gradual decrease followed by an increase in local emission intensity of the area around 111 regions bounded by 211 regions 3 an initial increase followed by a decrease in the size of the lowintensity regions around 110 and 211 and 4 an initial decrease followed by an increase in the size of the low intensity regions around 100.

Descriptors:

• *ELECTRON TUBES
• *FIELD EMISSION
• *OXIDATION
• *OXIDES
• ADSORPTION
• CHEMICAL REACTIONS
• CRYSTAL STRUCTURE
• DIFFUSION
• SURFACE PROPERTIES
• TUNGSTEN

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE