Model of Fractal Particles of Hydrated Zirconium Dioxide, Based on Small-Angle Neutron Scattering Data
The parameters of the mesostructure of amorphous zirconium dioxide and their evolution at different stages of heat treatment are determined by small-angle neutron scattering. Particles of amorphous zirconium dioxide, which form mass fractals with the dimension D v = 2.21, are rearranged into surface...
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Published in | Surface investigation, x-ray, synchrotron and neutron techniques Vol. 13; no. 5; pp. 908 - 913 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Moscow
Pleiades Publishing
01.09.2019
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | The parameters of the mesostructure of amorphous zirconium dioxide and their evolution at different stages of heat treatment are determined by small-angle neutron scattering. Particles of amorphous zirconium dioxide, which form mass fractals with the dimension
D
v
= 2.21, are rearranged into surface fractals with a surface dimension of
D
s
= 2.52 upon annealing at a temperature of 400°C or higher. In the resulting system, a shell with a fractal structure is formed over a dense core (a cluster of nanoparticles of zirconium dioxide with a constant density). Transformation of the fractal system from a mass fractal into a surface one is characterized by the appearance of a core, and its growth is due to the crystallization of hydrated zirconia particles at high temperatures. A model for the formation of a fractal particle, implying the existence of a core–shell surface fractal system, is proposed. The characteristic radius of ZrO
2
nanoparticles increases from 14 to 200 Å with an increase in the annealing temperature from 400 to 600°C. |
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ISSN: | 1027-4510 1819-7094 |
DOI: | 10.1134/S1027451019050215 |