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Double-Scanning Diffractometry in the Back-Reflection Region

  • Hubert W. King (a1) and Carolyn M. Russell (a1)

Abstract

A scanning range over Bragg angles from −163 to +163° 2θ is obtained by combining a diffractometer capable of scanning both sides of the primary X-ray beam with a very short (3-in.) high-power focused X-ray tube. The ability to scan the included angle 4θ between respective diffraction profiles on either side of the primary beam over the entire range of Bragg angles, provides a direct method of eliminating errors caused by a displacement of the specimen surface from the axis of the goniometer. The method is demonstrated by determining the lattice parameters of standard specimens used in the I.U.Cr. Precision Lattice Parameter Project.

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References

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1. Parrish, W., “Results of the I.U.Cr. Precision Lattice Parameter Project,” Acta Cryst. 13: 838, October 1960.
2. Vassamillet, L. F. and King, H. W., “Precision X-Ray Diffractometry Using Powder Specimens,” Advances in X-Ray Analysis, Vol. 6, William M. Mueller and Marie Fay (eds.), University of Denver, Plenum Press, New York, 1963, p. 142.
3. Wilson, A. J. C., “Geiger-Courtfer X-Ray Spectrometer—Influence of Size and Absorption Coefficient of Specimen on the Position and Shape of Diffraction Maxima,” J. Set. Instr. 27: 321, December 1950.
4. King, H. W. and Vassamillet, L. F., “Precision Lattice Parameter Determination by Double-Scanning Diffractometry,” Advances in X-Ray Analysis, Vol. 5, William M. Mueller (ed.), University of Denver, Plenum Press, New York, 1962, p. 78.
5. Vassamillet, L. F. and King, H. W., “Diffractometer Techniques,” Handbook of X-Rays, Section 2, III, McGraw-Hill, Book Co., Inc., New York (in press).
6. Delf, B. W., “The Practical Determination of Lattice Parameters Using the Centroid Method,” Brit. J. Appl. Phys, 14: 345, June 1963.
7. Franks, A., “The Precision Measurement of Lattice Parameters Using an X-Ray Back-Reflection Focusing Camera” (to be published).

Double-Scanning Diffractometry in the Back-Reflection Region

  • Hubert W. King (a1) and Carolyn M. Russell (a1)

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