VYUŽITÍ RTG PRÁŠKOVÉ DIFRAKCE PRO STANOVENÍ CHEMICKÉHO SLOŽENÍ MINERÁLŮ ŘADY ZIRKONU

Roč.7,(2000)

Václav Vávra

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Abstrakt
Calculated XRD powder patterns for sixty solid solutions in zircone-thorite-hafnone ternary system were used to provide the schematic identification diagram for the composition of zircon-group minerals. The diagram is based on the changes of calculated diffraction angle 2Θ (diffraction 200 plane) and of the integral intensity ratio of the 101 and 200 reflections (I101/I200).

Klíčová slova:
zircone-group; X-ray powder diffraction; modelled patterns
Reference

Dana´s New Mineralogy, John Wiley & sons, New York, 1997.

Farges, F. - Calas, G. (1991): Structural analysis of radiation damage in zircon and thorite: An X-ray absorption spectroscopic study. - American Mineralogist, 76, 60-73.

Finger, L.V. (1974): Refinement of the crystal structure of zircon. - Carnegie Institut of Washington: Yearbook, vol. 73.

Fuchs, L. H. - Gebert, E. (1958): X-ray studies of synthetic coffinite, thorite and uranothorites.- American Mineralogist, 43, 243-248.

Hazen, R. M. - Finger, L. W. (1979): Crystal structure and compressibility of zircon at high pressure. - American Mineralogist, 64, 157-161.

Smrčok, L. - Weiss, Z. (1993): DIFK1: A program for the modelling of the powder diffraction patterns on a PC. - J. Appl. Cryst., 26, 140-141.

Taylor, M. - Ewing, R. C. (1978): The crystal structure of ThSiO4 polymorphs: Huttonite and thorite.- Acta Crystallographica,B34, 1074-1079.

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