Short-range structure of zirconia xerogel and aerogel, determined by wide angle X-ray scattering

https://doi.org/10.1016/0022-3093(93)91260-AGet rights and content

Abstract

The short-range structure of amorphous zirconia, investigated by X-ray diffraction, has been found to bear more resemblance to the monoclinic ZrO2 structure than it does to the tetragonal structure. This result was achieved in two zirconia samples (xerogel and aerogel) by analyzing both the positions of the maxima of the experimental (Fourier-transformed) ‘reduced’ radial correlation function, G(r), and the experimental radial atom (number) density distribution, p(r). This latter function was simulated as a weighted sum of three partial atom density distributions, ϱZrO, ϱZrZr, and τOO, based on the monoclinic or the tetragonal coordination frame and limited inside a sphere of 9 Å in radius. The coordination statistics are described in terms of sums of Gaussian functions into which distortion effects (first-type and second-type disorder) were introduced.

References (20)

  • P. Colomban

    Ceram. Int.

    (1989)
  • S.J. Teichner et al.

    J. Colloid Interf. Sci.

    (1976)
  • P.D.L. Mercera et al.

    Appl. Catal.

    (1991)
  • G.M. Pajonk

    Appl. Catal.

    (1991)
  • J. Zarzycki

    Materials Science and Technology

  • J. Livage et al.

    J. Am. Ceram. Soc.

    (1968)
  • Y. Murase et al.

    Nippon Kogaku Kaishi

    (1972)
  • M.I. Osendi et al.

    J. Am. Ceram. Soc.

    (1985)
  • E. Tani et al.

    J. Am. Ceram. Soc.

    (1981)
    E. Tani et al.

    J. Am. Ceram. Soc.

    (1983)
  • P.E.D. Morgan

    J. Am. Ceram. Soc.

    (1984)
There are more references available in the full text version of this article.

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This research project was funded by Italian C.N.R. ‘Progetto Finalizzato: Materiali Speciali per Tecnologie Avanzate’ and by the Italian MURST (quota 40%).

1

Permanent address: Nanjing Institute of Chemical Technology, Nanjing 21009, People's Republic of China.

a

The authors are grateful to Professor G. Piccaluga of the University of Cagliari for his valuable comments.

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