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 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 |
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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
Cite this
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
}
TY - GEN
T1 - The estimation parameter of nanoceramics crystalline structure deviation from thermodynamically equilibrium state
AU - Khasanov, O.
AU - Dvilis, E.
AU - Miloivanova, T.
PY - 2003
Y1 - 2003
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
UR - http://www.scopus.com/inward/record.url?scp=84944316658&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84944316658&partnerID=8YFLogxK
M3 - Conference contribution
SN - 8978686176
SN - 9788978686174
VL - 1
SP - 157
EP - 160
BT - Proceedings - KORUS 2003: 7th Korea-Russia International Symposium on Science and Technology
PB - Institute of Electrical and Electronics Engineers Inc.
ER -