The estimation parameter of nanoceramics crystalline structure deviation from thermodynamically equilibrium state

Abstract

Using XRD techniques the correlations of the relative crystallite microstrains (RCM) with apparent crystallite sizes (ACS) for zirconia ceramic nanopowders, their green compacts pressed under different power of ultrasound action, and nanostructured ceramics sintered from them at various temperatures were analyzed. It was shown, that for all the samples the RCM values are inversely proportional to magnitudes of ACS with proportionality coefficient k, which is constant with high precision for the same material in equilibrium state. Physically coefficient k is a value of ACS actual change Δd_ACS under microstresses action of crystallite having the certain defective substructure in a material existing in a stable state. The equation for coefficient k as a quantity of actual change of the ACS under microstrains action was offered. The difference between the coefficient k for ceramics sintered at lower temperatures and its statistical average value for ceramics sintered at optimal temperature reflects a deviation degree of the examined matter structure from thermodynamically equilibrium state. This deviation can be an estimation parameter of ceramics processing efficiency or compliance of technological conditions with optimal ones. 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
Title of host publication	Proceedings - KORUS 2003: 7th Korea-Russia International Symposium on Science and Technology
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	157-160
Number of pages	4
Volume	1
ISBN (Print)	8978686176, 9788978686174
Publication status	Published - 2003
Event	7th Korea-Russia International Symposium on Science and Technology, KORUS 2003 - Ulsan, Korea, Republic of Duration: 28 Jun 2003 → 6 Jul 2003

Other

Other	7th Korea-Russia International Symposium on Science and Technology, KORUS 2003
Country	Korea, Republic of
City	Ulsan
Period	28.6.03 → 6.7.03

Keywords

Ceramics
Crystalline materials
Crystallization
Nanoparticles
Nanostructures
Parameter estimation
State estimation
Temperature distribution
Ultrasonic imaging
X-ray scattering

ASJC Scopus subject areas

Building and Construction
Pollution
Biotechnology
Social Sciences (miscellaneous)
Medicine (miscellaneous)
Education

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The estimation parameter of nanoceramics crystalline structure deviation from thermodynamically equilibrium state. / Khasanov, O.; Dvilis, E.; Miloivanova, T.

Proceedings - KORUS 2003: 7th Korea-Russia International Symposium on Science and Technology. Vol. 1 Institute of Electrical and Electronics Engineers Inc., 2003. p. 157-160 1222424.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Khasanov, O , Dvilis, E & Miloivanova, T 2003, The estimation parameter of nanoceramics crystalline structure deviation from thermodynamically equilibrium state. in Proceedings - KORUS 2003: 7th Korea-Russia International Symposium on Science and Technology. vol. 1, 1222424, Institute of Electrical and Electronics Engineers Inc., pp. 157-160, 7th Korea-Russia International Symposium on Science and Technology, KORUS 2003, Ulsan, Korea, Republic of, 28.6.03.

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abstract = "Using XRD techniques the correlations of the relative crystallite microstrains (RCM) with apparent crystallite sizes (ACS) for zirconia ceramic nanopowders, their green compacts pressed under different power of ultrasound action, and nanostructured ceramics sintered from them at various temperatures were analyzed. It was shown, that for all the samples the RCM values are inversely proportional to magnitudes of ACS with proportionality coefficient k, which is constant with high precision for the same material in equilibrium state. Physically coefficient k is a value of ACS actual change ΔdACS under microstresses action of crystallite having the certain defective substructure in a material existing in a stable state. The equation for coefficient k as a quantity of actual change of the ACS under microstrains action was offered. The difference between the coefficient k for ceramics sintered at lower temperatures and its statistical average value for ceramics sintered at optimal temperature reflects a deviation degree of the examined matter structure from thermodynamically equilibrium state. This deviation can be an estimation parameter of ceramics processing efficiency or compliance of technological conditions with optimal ones. The modulus of | k ΔdACS | was minimal for the structural zirconia ceramics sintered at optimum temperature and having the maximum mechanical characteristics.",

keywords = "Ceramics, Crystalline materials, Crystallization, Nanoparticles, Nanostructures, Parameter estimation, State estimation, Temperature distribution, Ultrasonic imaging, X-ray scattering",

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year = "2003",

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AU - Khasanov, O.

AU - Dvilis, E.

AU - Miloivanova, T.

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N2 - Using XRD techniques the correlations of the relative crystallite microstrains (RCM) with apparent crystallite sizes (ACS) for zirconia ceramic nanopowders, their green compacts pressed under different power of ultrasound action, and nanostructured ceramics sintered from them at various temperatures were analyzed. It was shown, that for all the samples the RCM values are inversely proportional to magnitudes of ACS with proportionality coefficient k, which is constant with high precision for the same material in equilibrium state. Physically coefficient k is a value of ACS actual change ΔdACS under microstresses action of crystallite having the certain defective substructure in a material existing in a stable state. The equation for coefficient k as a quantity of actual change of the ACS under microstrains action was offered. The difference between the coefficient k for ceramics sintered at lower temperatures and its statistical average value for ceramics sintered at optimal temperature reflects a deviation degree of the examined matter structure from thermodynamically equilibrium state. This deviation can be an estimation parameter of ceramics processing efficiency or compliance of technological conditions with optimal ones. The modulus of | k ΔdACS | was minimal for the structural zirconia ceramics sintered at optimum temperature and having the maximum mechanical characteristics.

AB - Using XRD techniques the correlations of the relative crystallite microstrains (RCM) with apparent crystallite sizes (ACS) for zirconia ceramic nanopowders, their green compacts pressed under different power of ultrasound action, and nanostructured ceramics sintered from them at various temperatures were analyzed. It was shown, that for all the samples the RCM values are inversely proportional to magnitudes of ACS with proportionality coefficient k, which is constant with high precision for the same material in equilibrium state. Physically coefficient k is a value of ACS actual change ΔdACS under microstresses action of crystallite having the certain defective substructure in a material existing in a stable state. The equation for coefficient k as a quantity of actual change of the ACS under microstrains action was offered. The difference between the coefficient k for ceramics sintered at lower temperatures and its statistical average value for ceramics sintered at optimal temperature reflects a deviation degree of the examined matter structure from thermodynamically equilibrium state. This deviation can be an estimation parameter of ceramics processing efficiency or compliance of technological conditions with optimal ones. The modulus of | k ΔdACS | was minimal for the structural zirconia ceramics sintered at optimum temperature and having the maximum mechanical characteristics.

KW - Ceramics

KW - Crystalline materials

KW - Crystallization

KW - Nanoparticles

KW - Nanostructures

KW - Parameter estimation

KW - State estimation

KW - Temperature distribution

KW - Ultrasonic imaging

KW - X-ray scattering

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BT - Proceedings - KORUS 2003: 7th Korea-Russia International Symposium on Science and Technology

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