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The Quality of X-ray Diffraction Standards for Phosphate Minerals and the Degree of Success in Computer Identification

Published online by Cambridge University Press:  06 March 2019

Frank N. Blanchard
Frank N. Blanchard*
Affiliation:
Department of Geology University of Florida Gainesville, FL 32611
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Extract

Sixty-five years ago Hull first described X-ray powder diffraction as a means of phase identification, and 45 years ago Hannawalt and co-workers compiled the first catalogue of powder diffraction patterns, which has evolved into a file of about 44,000 patterns (the X-ray Powder Diffraction File or PDF). The Hannawalt method of manually searching the PDF is a time-tested, effective tool in seeking a match between an unknown pattern and its correct counterpart(s) in the PDF. Recently, computerized powder diffractometers with software to perform data reduction and search the PDF have become relatively common, and these systems offer tremendous potential for rapid and accurate phase identification in simple and complex systems where the data base may include 44,000 patterns.

Type
IX. XRD Search/Match Methods and Quantitative Analysis
Information
Advances in X-Ray Analysis , Volume 28: Thirty-Third Annual Conference on Applications of X-ray Analysis, July 30 - August 3, 1984 , 1984 , pp. 305 - 308
Copyright
Copyright © International Centre for Diffraction Data 1984

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References

Blanchard, F. N., 1984, Evaluation of existing X-ray powder diffraction standards for phosphate minerals. Advances in X-ray Analysis, 26, 61–66.Google Scholar
Smith, G. S. and Snyder, R. L., 1979, F(N): a criterion for rating powder diffraction patterns and evaluating reliability of powder pattern indexing. J. Appl. Cryst., 12, 60–65.Google Scholar