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

O. Khasanov, E. Dvilis, T. Miloivanova

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

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.

Original languageEnglish
Title of host publicationProceedings - KORUS 2003: 7th Korea-Russia International Symposium on Science and Technology
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages157-160
Number of pages4
Volume1
ISBN (Print)8978686176, 9788978686174
Publication statusPublished - 2003
Event7th Korea-Russia International Symposium on Science and Technology, KORUS 2003 - Ulsan, Korea, Republic of
Duration: 28 Jun 2003 → 6 Jul 2003

Other

Other7th Korea-Russia International Symposium on Science and Technology, KORUS 2003
CountryKorea, Republic of
CityUlsan
Period28.6.03 → 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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    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, pp. 157-160). [1222424] Institute of Electrical and Electronics Engineers Inc..