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Sintering of Defect-Free BaTi0.975Sn0.025O3/BaTi0.85Sn0.15O3 Functionally Graded Materials

Authorized Users Only
2011
Authors
Marković, Smilja
Uskoković, Dragan
Contributors
Nair, K. M.
Jia, Q
Priya, S.
Book part (Published version)
Metadata
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Abstract
Shrinkage anisotropy could be one of the reasons of deformation during densification of functionally graded materials (FGMs). In this study we calculated coefficient of shrinkage anisotropy during sintering of BTS2.5/BTS15 FGMs by different heating rates of 2, 5, 10 and 20 7min. We found that concentration gradient in BTS2.5/BTS15 FGMs implies a gradient of anisotropy coefficient. Moreover, we calculated effective activation energy for sintering of BTS2.5/BTS15 FGMs and compared with those for BTS2.5 and BTS15 graded layers. The values of 359.5 and 340.5 kJ/mol were obtained for BTS2.5 and BTS15 graded layers, respectively, while for the sintering of entire BTS2.5/BTS15 FGMs the value of 460 kJ/mol was obtained. The difference between the effective activation energy could be attributed to potential insulator interlayer formed between layers during uniaxial pressing. Impedance spectroscopy was used to determine the electrical characteristics of BTS2.5/BTS15 FGMs sintered by different he...ating rates, as well as to determine influence of concentration gradient on intrinsic and microstructural features. Activation energies of BTS2.5/BTS15 FGMs, separately for grain interior and grain boundary, were calculated. It was established that the activation energy deduced from grain-interior conductivity kept the intrinsic properties (0.71-0.73 eV) and is not influenced by tin/titanium concentration gradient, neither by heating rate. However, activation energy for grain boundary conductivity (1.05-1.24 eV) is determined by microstructural development (density and average grain size) which is a consequence of both concentration gradient developed during sintering processes and heating rate. Finally, electrical properties of BTS2.5/BTS15 FGMs sintered by different heating rates were correlated with their microstructure.

Keywords:
functionally graded materials / densification / anisotropy coefficient / activation energy / impedance spectroscopy
Source:
Advances and Applications in Electroceramics, 2011, 97-106
Publisher:
  • Hoboken, NJ : John Wiley & Sons
Projects:
  • Molecular designing of nanoparticles with controlled morphological and physicochemical characteristics and functional materials based on them (RS-45004)

DOI: 10.1002/9781118144480.ch11

ISBN: 9781118059999

Scopus: 2-s2.0-84955414519
[ Google Scholar ]
URI
http://dais.sanu.ac.rs/123456789/713
Collections
  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
Institution
Институт техничких наука САНУ / Institute of Technical Sciences of SASA
TY  - CHAP
AU  - Marković, Smilja
AU  - Uskoković, Dragan
PY  - 2011
UR  - http://dais.sanu.ac.rs/123456789/713
AB  - Shrinkage anisotropy could be one of the reasons of deformation during densification of functionally graded materials (FGMs). In this study we calculated coefficient of shrinkage anisotropy during sintering of BTS2.5/BTS15 FGMs by different heating rates of 2, 5, 10 and 20 7min. We found that concentration gradient in BTS2.5/BTS15 FGMs implies a gradient of anisotropy coefficient. Moreover, we calculated effective activation energy for sintering of BTS2.5/BTS15 FGMs and compared with those for BTS2.5 and BTS15 graded layers. The values of 359.5 and 340.5 kJ/mol were obtained for BTS2.5 and BTS15 graded layers, respectively, while for the sintering of entire BTS2.5/BTS15 FGMs the value of 460 kJ/mol was obtained. The difference between the effective activation energy could be attributed to potential insulator interlayer formed between layers during uniaxial pressing. Impedance spectroscopy was used to determine the electrical characteristics of BTS2.5/BTS15 FGMs sintered by different heating rates, as well as to determine influence of concentration gradient on intrinsic and microstructural features. Activation energies of BTS2.5/BTS15 FGMs, separately for grain interior and grain boundary, were calculated. It was established that the activation energy deduced from grain-interior conductivity kept the intrinsic properties (0.71-0.73 eV) and is not influenced by tin/titanium concentration gradient, neither by heating rate. However, activation energy for grain boundary conductivity (1.05-1.24 eV) is determined by microstructural development (density and average grain size) which is a consequence of both concentration gradient developed during sintering processes and heating rate. Finally, electrical properties of BTS2.5/BTS15 FGMs sintered by different heating rates were correlated with their microstructure.
PB  - Hoboken, NJ : John Wiley & Sons
T2  - Advances and Applications in Electroceramics
T1  - Sintering of Defect-Free BaTi0.975Sn0.025O3/BaTi0.85Sn0.15O3 Functionally Graded Materials
SP  - 97
EP  - 106
DO  - 10.1002/9781118144480.ch11
ER  - 
@article{
author = "Marković, Smilja and Uskoković, Dragan",
year = "2011",
url = "http://dais.sanu.ac.rs/123456789/713",
abstract = "Shrinkage anisotropy could be one of the reasons of deformation during densification of functionally graded materials (FGMs). In this study we calculated coefficient of shrinkage anisotropy during sintering of BTS2.5/BTS15 FGMs by different heating rates of 2, 5, 10 and 20 7min. We found that concentration gradient in BTS2.5/BTS15 FGMs implies a gradient of anisotropy coefficient. Moreover, we calculated effective activation energy for sintering of BTS2.5/BTS15 FGMs and compared with those for BTS2.5 and BTS15 graded layers. The values of 359.5 and 340.5 kJ/mol were obtained for BTS2.5 and BTS15 graded layers, respectively, while for the sintering of entire BTS2.5/BTS15 FGMs the value of 460 kJ/mol was obtained. The difference between the effective activation energy could be attributed to potential insulator interlayer formed between layers during uniaxial pressing. Impedance spectroscopy was used to determine the electrical characteristics of BTS2.5/BTS15 FGMs sintered by different heating rates, as well as to determine influence of concentration gradient on intrinsic and microstructural features. Activation energies of BTS2.5/BTS15 FGMs, separately for grain interior and grain boundary, were calculated. It was established that the activation energy deduced from grain-interior conductivity kept the intrinsic properties (0.71-0.73 eV) and is not influenced by tin/titanium concentration gradient, neither by heating rate. However, activation energy for grain boundary conductivity (1.05-1.24 eV) is determined by microstructural development (density and average grain size) which is a consequence of both concentration gradient developed during sintering processes and heating rate. Finally, electrical properties of BTS2.5/BTS15 FGMs sintered by different heating rates were correlated with their microstructure.",
publisher = "Hoboken, NJ : John Wiley & Sons",
journal = "Advances and Applications in Electroceramics",
title = "Sintering of Defect-Free BaTi0.975Sn0.025O3/BaTi0.85Sn0.15O3 Functionally Graded Materials",
pages = "97-106",
doi = "10.1002/9781118144480.ch11"
}
Marković S, Uskoković D. Sintering of Defect-Free BaTi0.975Sn0.025O3/BaTi0.85Sn0.15O3 Functionally Graded Materials. Advances and Applications in Electroceramics. 2011;:97-106
Marković, S.,& Uskoković, D. (2011). Sintering of Defect-Free BaTi0.975Sn0.025O3/BaTi0.85Sn0.15O3 Functionally Graded Materials.
Advances and Applications in ElectroceramicsHoboken, NJ : John Wiley & Sons., null, 97-106. 
https://doi.org/10.1002/9781118144480.ch11
Marković Smilja, Uskoković Dragan, "Sintering of Defect-Free BaTi0.975Sn0.025O3/BaTi0.85Sn0.15O3 Functionally Graded Materials" null (2011):97-106,
https://doi.org/10.1002/9781118144480.ch11 .

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