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X-ray differential line broadening on tabular haematites

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Abstract

The haematites obtained by dehydration of three synthetic goethites of different sizes have been characterized by X-ray diffraction, Mössbauer spectroscopy and transmission electron microscopy. The transformation itself has been studied by thermogravimetric analysis and differential scanning calorimetry. Samples (24) obtained by annealing the goethites for 30 min at several temperatures up to 900°C were analysed. All samples had a tabular shape. The variation of the internal magnetic field, as well as of the line widths of the spectra at room temperature, indicate growth of the particle size. The constant value for the quadrupole splitting and the absence of a distribution of hyperfine interactions of the spectra at 80 K excluded the presence of iron ions out of their normal positions. No strain was detected by X-ray diffraction. The results also showed a differential line broadening in the haematite pattern, but there was no shift in the position of the lines. This broadening was present in all lines, including those wihl=3n (n=0,1,2,...). Increasing the treatment temperature made all lines sharp. The relative integrated intensities,l(1 1 0)/l(1 0 4), of each series remained unaltered, but the relative intensities did not. The above results lead to the conclusion that the differential X-ray line broadening of haematites derived from goethite occurs only in tabular (or acicular) haematites with small size. For small spherical particles, the broadening should be uniform for all lines.

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References

  1. M. H. Francombe andH. P. Rooksby,Clay Minerals Bull. 4 (1959) 1.

    Google Scholar 

  2. H. P. Rooksby,Silicates Industriels 25 (1960) 335.

    Google Scholar 

  3. J. Lima deFaria,Acta Crystallogr. 23 (1967) 733.

    Google Scholar 

  4. A. Thrierr-Sorel, J. P. Larpin andG. Mougin,Ann. Chim. Fr. 3 (1978) 305.

    Google Scholar 

  5. H. Naono andR. Fujiwara,J. Colloid Interface Sci. 73 (1980) 406.

    Google Scholar 

  6. F. Watari, J. V. Landuyt, P. Delavignette, S. Amelincks andN. Igata,Phys. Status Solidi (a) 73 (1982) 215.

    Google Scholar 

  7. P. H. Duvigneaud andR. Derie,J. Solid State Chem. 34 (1980) 323.

    Google Scholar 

  8. T. Yamaguchi andT. Takahashi,J. Amer. Ceram. Soc. 65 (1982) C(83).

    Google Scholar 

  9. J. Lima deFaria andP. Gay,Mineral. Magn. 33 (1962) 37.

    Google Scholar 

  10. J. Lima deFaria,Z. Kristallogr. 119 (1963) 176.

    Google Scholar 

  11. K. Nakajima, Y. Hirotsu andS. Okamoto,J. Amer. Ceram. Soc. 70 (1987) 321.

    Google Scholar 

  12. H. P. Klug andL. E. Alexander, in “X-ray diffraction procedures for polycristalline and amorphous materials” (Wiley, New York, 1974).

    Google Scholar 

  13. G. M. daCosta, E. Galvão daSilva andM. F. deJesus Filho,Hyperfine Interactions,67 (1991) 501.

    Google Scholar 

  14. U. Schwertmann,Thermochim. Acta 78 (1984) 39.

    Google Scholar 

  15. C. J. Goss,Mineral. Magn 51 (1987) 437.

    Google Scholar 

  16. E. Patterson andR. Swaffield,J. Therm. Anal. 18 (1980) 161.

    Google Scholar 

  17. S. Goni-Elizalde andE. Garcia-Clavel,Thermochim. Acta 124 (1988) 359.

    Google Scholar 

  18. L. G. Berry, in “Selected powder diffraction data for minerais” (JCPDS, PA, 1974) pp. 365, 533.

    Google Scholar 

  19. J. M. Friedt, G. K. Shenoy, G. Abstreiter andR. Poinsot,J. Chem. Phys. 59 (1973) 3831.

    Google Scholar 

  20. J. M. Friedt, M. F. deJesus Filho andJ. P. Sanches,Phys. Status Solidi (b) 102 (1980) 373.

    Google Scholar 

  21. J. D. Artman, A. H. Muir andH. Wiedersich,Phys. Rev. 173 (1968) 337.

    Google Scholar 

  22. F. Watari, J. V. Landuyt, P. Delavignette andS. Amelincks,J. Solid State Chem. 29 (1979) 137.

    Google Scholar 

  23. F. Watari, P. Delavignette andS. Amelincks,ibid. 29 (1979) 417.

    Google Scholar 

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Da Costa, G.M., De Jesus Filho, M.F. X-ray differential line broadening on tabular haematites. J Mater Sci 27, 6116–6122 (1992). https://doi.org/10.1007/BF01133758

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