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“PC-PDF”: A Search/Display System Utilizing the CD-ROM and the Complete Powder Diffraction File

Published online by Cambridge University Press:  10 January 2013

R. Jenkins  and
M. Holomany
R. Jenkins
Affiliation:
International Centre for Diffraction Data, Swarthmore, PA, U.S.A.
M. Holomany
Affiliation:
International Centre for Diffraction Data, Swarthmore, PA, U.S.A.
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Abstract

The Powder Diffraction File (PDF) is a collection of single phase X-ray powder patterns, maintained and distributed by the JCPDS-International Centre for Diffraction Data. Over the past 10 years there has been increasing use of the PDF in computer readable form, but the limited amount of disk space available on most commercial powder diffractometer systems has limited use to a small subset of the total PDF. The recent availability of low-cost Compact Disk Read Only Memory (CD-ROM) systems offers an attractive alternative to conventional disk media. This paper describes a low-cost Personal Computer/CD-ROM system, “PC-PDF”, having a total available storage of 550 Mbytes. While seek times are relatively slow – typically, 0.5 seconds are required to traverse the complete PDF – by use of optimum packing and access algorithms, search strategies based on PDF numbers, chemistry, strongest d-spacing, etc., operate at a speed causing no great inconvenience to the user.

Type
Research Article
Information
Powder Diffraction , Volume 2 , Issue 4 , December 1987 , pp. 215 - 219
Copyright
Copyright © Cambridge University Press 1987

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References

1.Jenkins, R. and Smith, D., “The Powder Diffraction File”, IUCr Data Base Commission Report, August 1987.Google Scholar
2.Hanawalt, J. D., “History of the Powder Diffraction File” in “Crystallography in North America – Apparatus & Methods, Chapter 2”, p. 215–219, American Crystallographic Association (1983).Google Scholar
3.Jenkins, R., Holomany, M. and Wong-Ng, W., “On the Need for Users of the Powder Diffraction File to Update Regularly”, Powder Diffraction, (1987), in press.CrossRefGoogle Scholar
4. Norelco Reporter – Special issue on “Automated Powder Diffractometry”, Volume 30, No. IX, February (1983).Google Scholar
5.Snyder, R. L., Johnson, Q. C., Kahara, E., Smith, G. S. and Nichols, M. C., “An Analysis of the Powder Diffraction File”, Lawrence Livermore National Laboratory Report, UCRL-52505, June 22, 1978.CrossRefGoogle Scholar
6.Wong-Ng, W., Holomany, M., McClune, F. and Hubbard, C. R., “The JCPDS Data Base – Present and Future”, Adv. X-Ray Anal., 26, 87–88, (1982).Google Scholar
7.Mighell, A. D., Hubbard, C. R. and Stalick, J. K., “NBS*AIDS80. A FORTRAN Program for Crystallographic Data Evaluation”, National Bureau of Standards, Technical Note 1141 (1981), NBS, Washington, D.C.CrossRefGoogle Scholar
8.Hanawalt, J. D., Rinn, H. W. and Frevel, L., “Chemical Analysis by X-ray Diffraction – Classification and Use of X-ray Diffraction Patterns” Ind. Eng. Chem., Anal. Ed., 10, 457–512. (1938).CrossRefGoogle Scholar
9.Levine, R., “Optical Storage”, DEC Professional, February 1987, p.30.Google Scholar
10. “Optical Disk Product Proposal”, by Wong-Ng, W., December 1984.Google Scholar
11. The Electronic Encyclopedia, Grolier Electronic Publishing, Sherman Turnpike, Danbury, CT 06816.Google Scholar
12. Available from Reference Technology Inc., 1832 N. 55th Street, Boulder, CO 80301, USA.Google Scholar
13. Available from Reteaco Inc., 716 Gordon Baker Road, Willowdale, Ontario M2H 3B4, Canada.Google Scholar
14.NBS Crystal Data File (1982), “A magnetic tape of crystallographic and chemical data compiled and evaluated by the NBS Crystal Data Center,” National Bureau of Standards, Gaithersburg, MD 20899, USA, available from JCPDS-Intemational Centre for Diffraction Data, Swarthmore, PA, 19081, USA.Google Scholar