The deviation coefficient of crystalline nanoceramics structure from thermodynamically equilibrium state

Abstract

By XRD analysis of YSZ nanopowders and ceramics sintered from them it was shown that relative crystallite microstresses vary inversely as sizes of the area of coherent scattering with some coefficient of proportionality k. Physically coefficient k is a value of actual change of the average crystallite size Δd_ACS under microstresses action of crystallite having the certain defective substructure in a material existing in a stable state. The difference between the coefficient k and calculated value of the Δd _ACS reflects a deviation degree of the examined matter structure from thermodynamically equilibrium state, and may be considered as parameter of efficiency of technological processing conditions. The modulus of | k -Δd_ACS | was minimal for the structural zirconia ceramics sintered at optimum temperature and having the maximum mechanical characteristics.

Original language	English
Pages (from-to)	2367-2370
Number of pages	4
Journal	Key Engineering Materials
Volume	264-268
Issue number	III
Publication status	Published - 2004

Keywords

Apparent Crystallite Size
Equilibrium State
Nanoceramics
Optimal Processing
Relative Microstresses

ASJC Scopus subject areas

Ceramics and Composites
Chemical Engineering (miscellaneous)

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Khasanov, O. L., & Dvilis, E. S. (2004). The deviation coefficient of crystalline nanoceramics structure from thermodynamically equilibrium state. Key Engineering Materials, 264-268(III), 2367-2370.

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AU - Khasanov, O. L.

AU - Dvilis, E. S.

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AB - By XRD analysis of YSZ nanopowders and ceramics sintered from them it was shown that relative crystallite microstresses vary inversely as sizes of the area of coherent scattering with some coefficient of proportionality k. Physically coefficient k is a value of actual change of the average crystallite size ΔdACS under microstresses action of crystallite having the certain defective substructure in a material existing in a stable state. The difference between the coefficient k and calculated value of the Δd ACS reflects a deviation degree of the examined matter structure from thermodynamically equilibrium state, and may be considered as parameter of efficiency of technological processing conditions. The modulus of | k -ΔdACS | was minimal for the structural zirconia ceramics sintered at optimum temperature and having the maximum mechanical characteristics.

KW - Apparent Crystallite Size

KW - Equilibrium State

KW - Nanoceramics

KW - Optimal Processing

KW - Relative Microstresses

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