SHORT-RANGE STRUCTURE OF ZIRCONIA XEROGEL AND AEROGEL, DETERMINED BY WIDE-ANGLE X-RAY-SCATTERING

Citation
Yw. Zeng et al., SHORT-RANGE STRUCTURE OF ZIRCONIA XEROGEL AND AEROGEL, DETERMINED BY WIDE-ANGLE X-RAY-SCATTERING, Journal of non-crystalline solids, 155(3), 1993, pp. 259-266
Citations number
21
Categorie Soggetti
Material Science, Ceramics
ISSN journal
00223093
Volume
155
Issue
3
Year of publication
1993
Pages
259 - 266
Database
ISI
SICI code
0022-3093(1993)155:3<259:SSOZXA>2.0.ZU;2-C
Abstract
The short-range structure of amorphous zirconia, investigated by X-ray diffraction, has been found to bear more resemblance to the monoclini c ZrO2 structure than it does to the tetragonal structure. This result was achieved in two zirconia samples (xerogel and aerogel) by analyzi ng both the positions of the maxima of the experimental (Fourier-trans formed) 'reduced' radial correlation function, G(r), and the experimen tal radial atom (number) density distribution, rho(r). This latter fun ction was simulated as a weighted sum of three partial atom density di stributions, rho(Zr-O)', rho(Zr-Zr)', and rho(O-O)', based on the mono clinic or the tetragonal coordination frame and limited inside a spher e of 9 angstrom in radius. The coordination statistics are described i n terms of sums of Gaussian functions into which distortion effects (f irst-type and second-type disorder) were introduced.