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Use of a high X-ray flux instrument for a mineral: X-ray powder diffraction pattern of CaMg(CO3)2

Published online by Cambridge University Press:  10 January 2013

Yoshikazu Suzuki ,
Peter E. D. Morgan  and
Koichi Niihara
Yoshikazu Suzuki
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567, Japan Rockwell Science Center, Thousand Oaks, CA, 91360
Peter E. D. Morgan
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567, Japan Rockwell Science Center, Thousand Oaks, CA, 91360
Koichi Niihara*
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567, Japan Rockwell Science Center, Thousand Oaks, CA, 91360
*
a)Corresponding author: TEL: +81-6-879-8440; FAX: +81-6-879-8444.
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Abstract

The usefulness of a high X-ray flux instrument to improve the accuracy of a powder diffraction pattern is demonstrated. In this case, very weak reflections of a well-characterized and well-known natural mineral can be detected by an often-used X-ray rotating anode diffractometer. High purity natural dolomite, CaMg(CO3)2, for example, was used to produce a slightly more comprehensive indexed X-ray powder diffraction. The powder pattern obtained in this study was compared with that of the reported high quality PDF pattern (36-426, with “*” mark) and that of a calculated pattern derived from single crystal structure data. A very weak 003 reflection at low angle and many weak reflections at high angles, not reported in the PDF pattern, were successfully identified using this high-power X-ray instrument. Unit cell parameters were determined to be a=4.8090±0.0001 Å and c=16.0182±0.0003 Å, which were in good agreement with the extant PDF pattern. Accuracy of the relative intensities between the measured and calculated patterns was apparently somewhat improved in this study, probably also attained through less preferred orientation and the higher purity of the sample used.

Keywords

high X-ray flux instrumentnatural pure dolomitepuritycalculated pattern
Type
Research Article
Information
Powder Diffraction , Volume 13 , Issue 4 , December 1998 , pp. 216 - 221
Copyright
Copyright © Cambridge University Press 1998

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References

Cater, E. D., and Buseck, P. R. (1985). “Mechanism of decomposition of dolomite, Ca 0.5Mg 0.5CO 3, in the electron microscope,” Ultramicroscopy 18, 241–251.CrossRefGoogle Scholar
Howie, R. A., and Broadhurst, F. M. (1958). “X-ray data for dolomite and ankerite,” Am. Mineral. 43, 1210–1214.Google Scholar
Izumi, F. (1993). “Rietveld analysis programs RIETAN and PREMOS and special applications,” The Rietveld Method, edited by R. A. Young (Oxford University Press, Oxford), Chap. 13.Google Scholar
Jenkins, R., Holomany, M., and Wong-Ng, W. (1987). “On the need for users of the Powder Diffraction File to update regularly,” Powder Diffr. 2, 84–87.CrossRefGoogle Scholar
Keller, L., and McCarthy, G. J. (1985). PDF 36-426 for CaMg(CO 3)2, JCPDS-ICDD.Google Scholar
Kim, Y.-I., and Izumi, F. (1994). “Structure refinements with a new version of the Rietveld-refinement program RIETAN,” J. Ceram. Soc. Jpn. 102, 401–404.CrossRefGoogle Scholar
McCarthy, G. J., and Welton, J. M. (1989). “X-ray diffraction data for SnO 2. An illustration of the new powder data evaluation method,” Powder Diffr., 4, 156–159.CrossRefGoogle Scholar
McMurdie, H. F., Morris, M. C., Evans, E. H., Paretzkin, B., and Wong-Ng, W. (1986). “Methods of producing standard X-ray diffraction powder patterns,” Powder Diffr. 1, 40–43.CrossRefGoogle Scholar
Morgan, P. E. D., and Schaeffer, N. C. (1966). “Chemically activated pressure sintering of oxides,” Report AFML-TR-66-356 (Nov.).Google Scholar
Morgan, P. E. D. (1970). “Superplasticity in ceramics,” in Ultrafine-Grain Ceramics (Syracuse University Press, New York), Chap. 12.Google Scholar
Powell, E. K., and Searcy, A. W. (1978). “Kinetics and thermodynamics of decomposition of dolomite to a metastable solid product,” J. Am. Ceram. Soc. 61, 216–221.CrossRefGoogle Scholar
Smith, D. K., and Smith, K. L. (1987). MICRO-POWD, Materials Data, Inc., Livermore, CA.Google Scholar
Smith, G. S., and Snyder, R. L. (1979). “F N: a criterion for rating powder diffraction patterns and evaluating the reliability of powder-pattern indexing,” J. Appl. Crystallogr. 12, 60–65.CrossRefGoogle Scholar
Spinolo, G., and Tamburini, U. A. (1988). “Thermally induced and electron-induced decomposition of dolomite: a comparison of polythermal X-ray diffraction and transmission electron microscopy studies,” High Temp.-High Press. 20, 109–112.Google Scholar
Spinolo, G., and Tamburini, U. A. (1989). “Nonequilibrium (Ca,Mg)O solid solutions produced by chemical decomposition,” J. Phys. Chem. 93, 6837–6843.CrossRefGoogle Scholar
Steinfink, H., and Sans, F. J. (1959). “Refinement of the crystal structure of dolomite,” Am. Mineral. 44, 679–682.Google Scholar
Suzuki, Y., Morgan, P. E. D., Sekino, T., and Niihara, K. (1997). “Manufacturing nanodiphasic materials from natural dolomite: In situ observation of nano-phase formation behavior,” J. Am. Ceram. Soc. 80, 2949–2953.CrossRefGoogle Scholar
Toraya, H., and Kitamura, M. (1990). “Simultaneous peak-shift correction in the least-squares determination of unit-cell parameters of a sample with standard reference material,” J. Appl. Crystallogr. 23, 282–285.CrossRefGoogle Scholar
Wertheim, G. K., Butler, M. A., West, K. W., and Buchanan, D. N. E. (1974). “Determination of the Gaussian and Lorentzian content of experimental line shapes,” Rev. Sci. Instrum. 45, 1369–1371.CrossRefGoogle Scholar
Wyckoff, R. W. G. (1964). Crystal Structures, 2nd ed., Vol. 2 (Interscience, New York), pp. 466–468.Google Scholar