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High Resolution Transmission Electron Microscopy (HRTEM) of nanophase ferric oxidesIron oxide minerals are the prime candidates for Fe(III) signatures in remotely sensed Martian surface spectra. Magnetic, Mossbauer, and reflectance spectroscopy have been carried out in the laboratory in order to understand the mineralogical nature of Martian analog ferric oxide minerals of submicron or nanometer size range. Out of the iron oxide minerals studied, nanometer sized ferric oxides are promising candidates for possible Martian spectral analogs. 'Nanophase ferric oxide (np-Ox)' is a generic term for ferric oxide/oxihydroxide particles having nanoscale (less than 10 nm) particle dimensions. Ferrihydrite, superparamagnetic particles of hematite, maghemite and goethite, and nanometer sized particles of inherently paramagnetic lepidocrocite are all examples of nanophase ferric oxides. np-Ox particles in general do not give X-ray diffraction (XRD) patterns with well defined peaks and would often be classified as X-ray amorphous. Therefore, different np-Oxs preparations should be characterized using a more sensitive technique e.g., high resolution transmission electron microscopy (HRTEM). The purpose of this study is to report the particle size, morphology and crystalline order, of five np-Ox samples by HRTEM imaging and electron diffraction (ED).
Document ID
19940030927
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Golden, D. C. (Dual and Associates Houston, TX., United States)
Morris, R. V. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Ming, D. W. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Lauer, H. V., Jr. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1994
Publication Information
Publication: Lunar and Planetary Inst., The Twenty-Fifth Lunar and Planetary Science Conference. Part 1: A-G
Subject Category
Inorganic And Physical Chemistry
Accession Number
94N35433
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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