The Deviation Coefficient of Crystalline Nanoceramics Structure from Thermodynamically Equilibrium State

XRD analysis of YSZ nanopowders and ceramics sintered from them showed that the reactive crystallite microstresses (RCM) vary inversely with the sizes of the area of coherent scattering (ACS), according to a coefficient of proportionality k. Physically, coefficient k is a value of actual change of t...

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Bibliographic Details
Published in:Key Engineering Materials 2004-01, Vol.264-268, p.2367-2372
Main Authors: Khasanov, Oleg L., Dvilis, E.S.
Format: Article
Language:English
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Summary:XRD analysis of YSZ nanopowders and ceramics sintered from them showed that the reactive crystallite microstresses (RCM) vary inversely with the sizes of the area of coherent scattering (ACS), according to a coefficient of proportionality k. Physically, coefficient k is a value of actual change of the average crystallite size, Delta d(ACS), under microstress action of crystallites having a certain defective substructure in a material existing in a stable state. The difference between the coefficient k and calculated value of Delta d(ACS) reflects a degree of deviation of the structure from the thermodynamic equilibrium state, and may be considered as a parameter of the efficiency of the processing conditions. The modulus of k-Delta d(ACS) was minimal for the zirconia ceramics sintered at an optimum temperature and having the best mechanical characteristics. 5 refs.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.264-268.2367