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Texture Measurement of Sintered Alumina Using the Marchdollase Function

Published online by Cambridge University Press:  06 March 2019

James P. Cline ,
Mark D. Vaudin ,
John E. Blended ,
Carol A. Handwerker ,
Rodney Jiggetts ,
Keith J. Bowman  and
Nicholas Medendorp
James P. Cline
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
Mark D. Vaudin
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
John E. Blended
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
Carol A. Handwerker
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
Rodney Jiggetts
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
Keith J. Bowman
Affiliation:
National Institute of Standards and Technology Gaithersburg, Md 20899
Nicholas Medendorp
Affiliation:
Purdue University West Lafayette, In 47907
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Extract

The Rietveld method entails the calculation of a powder diffraction pattern from crystallographic, microstructural and equipment characteristics. These characteristics are related to the form of the pattern through a series of model functions. The difference between an observed and calculated pattern is then minimized by sequentially refining the physical parameters contained within the mode) functions to obtain an accurate and precise description of the specimen. A powder diffraction pattern from a specimen exhibiting cry stallo graphic texture, or preferred orientation, will display intensity values which differ systematically from those calculated for a specimen of random orientation. This systematic discrepancy can be addressed by incorporating into the Rietveld refinement a model function for sample texture. A successful model for texture will accurately assess the phase abundance and degree of texture from both oriented and randomized specimens. In this study we use the March-Dollase model function to characterize texture development in sintered alumina with respect to processing variables and sintering time.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 37: Forty-Second Annual Conference on Applications of X-ray Analysis, August 2-6, 1993 , 1993 , pp. 473 - 478
Copyright
Copyright © International Centre for Diffraction Data 1993

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References

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