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Accurate and precise lattice parameters by selected-area electron diffraction in the transmission electron microscope

Enrico Mugnaioli, Giancarlo Capitani, Fernando Nieto and Marcello Mellini
Accurate and precise lattice parameters by selected-area electron diffraction in the transmission electron microscope
American Mineralogist (May 2009) 94 (5-6): 793-800

Abstract

Lattice parameters for gold nanocrystals, quartz, and vesuvianite have been determined by electron diffraction in routine transmission electron microscopy (TEM) work, with precision and accuracy near to 0.1%, after correction for elliptical distortion. The distortion, measured in three different microscopes, is constant for each microscope and may be easily eliminated. Variable camera constants have been avoided by positioning the oriented specimen on the eucentric plane and using parallel illumination. The current flowing in the first intermediate lens was kept fixed, assuring constant conditions of the TEM projecting system, with no further diffraction focus applied. Application of this method to micas from metamorphic rocks produced deviations between measured and expected values up to 0.8%. Although easy species distinction is still possible, minor crystal chemical differences within the sample may be lost. Likely causes of these deviations are the possible heterogeneous samples, as well as beam damage leading to cation loss with subsequent variation in basal spacings.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 94
Serial Issue: 5-6
Title: Accurate and precise lattice parameters by selected-area electron diffraction in the transmission electron microscope
Affiliation: Johannes Gutenberg-Universitaet Mainz, Institut fuer Physikalische Chemie, Mainz, Federal Republic of Germany
Pages: 793-800
Published: 200905
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 19
Accession Number: 2009-054246
Categories: General mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
Secondary Affiliation: Universita di Bari, ITA, ItalyUniversidad de Granada, ESP, SpainUniversita di Siena, ITA, Italy
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200930
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