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An Approach to the Solid Solution Problem Using a Computerized Identification Technique

Published online by Cambridge University Press:  06 March 2019

Gerald G. Johnson Jr.  and
Frank L. Chan
Gerald G. Johnson Jr.
Affiliation:
Pennsylvania State University, University Park, Pa.
Frank L. Chan
Affiliation:
Wright-Patterson Air Force Base, Ohio
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Abstract

Since for most real systems, solid solution effects influence the position and intensity of the x-ray powder diffraction pattern, it is desirable and necessary to have an automatic system which will identify standard reference phases regardless of the amount of solid solution. Using the system CdS-ZnS, where the lattice parameter a0 changes from 4.136 to 3.820Å, with complete solid solution over the entire range of composition, an illustrative study was made. This work presents the results obtained from a computer analysis of the powder pattern obtained. It has been found that if the starting chemistry is known and the end members of the series are in the ASTM Powder Diffraction File, that the solid solution can be identified. Once the phases present are identified, a plot following Vegard's law yields the approximate composition of the sample under consideration. These two methods of compositional determination agree quite well. Examples of the computer system and description of the program input and output with interpretation of the results will be discussed.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 13: Eighteenth Annual Conference on Applications of X-ray Analysis, August 6-8, 1969 , 1969 , pp. 539 - 549
Copyright
Copyright © International Centre for Diffraction Data 1969

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