Accession Number:

AD0745981

Title:

Direct Observation of Iron Oxide Reduction Using High Voltage Microscopy.

Descriptive Note:

Final rept. 15 Sep 69-15 May 72,

Corporate Author:

IMPERIAL COLL OF SCIENCE AND TECHNOLOGY LONDON (ENGLAND) DEPT OF METALLURGY

Personal Author(s):

• Tighe,Nancy J.
• Swann,Peter R.

Report Date:

1972-05-15

Pagination or Media Count:

35.0

Abstract:

The microstructure of reaction products resulting from gaseous reduction of iron oxide has been examined in situ and ex situ by high voltage electron microscopy HVEM. In order to perform in situ experiments it was necessary to construct a special environmental cell for the AEI EM7 electron microscope. There have been no previous transmission electron microscopy studies of iron ores and whenever possible, micrographs of samples from various localities were obtained although not all the samples were used in reduction experiments. When hematite Fe2O3 is heated in a reducing atmosphere, magnetite Fe3O4 nucleates epitaxially at surfaces in contact with the gas. The morphology and rate of growth of the lower oxides were studied.

Descriptors:

• *REDUCTION(CHEMISTRY)
• *ELECTRON MICROSCOPY
• IRON OXIDES
• SURFACE PROPERTIES
• MAGNETITE
• ORES(METAL SOURCES)
• CARBON MONOXIDE
• NUCLEATION
• CRYSTAL GROWTH
• UNITED KINGDOM

Subject Categories:

• Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE