Microstructure and microchemistry of flash sintered K0.5Na0.5NbO3
Abstract
In this paper, flash sintering experiments were performed, for the first time, on sodium potassium niobate (KNN) ceramics. A theoretical density of 94% was achieved in 30 s under 250 V/cm electric-field at 990°C. These conditions are ~100°C lower and faster than the conventional sintering conditions. Grains tended to grow after 30 s. flash sintering duration under constant electric-field. Detailed microstructural and chemical investigations of the sample showed that there was inhomogenous Na, K distribution and it resembles a core–shell structure where K is more in the shell and Na is more in the core region. The inhomogenous distribution of Na and K was correlated with the doubling of the unit cell within the grain along 002 direction. Compositional equilibrium is achieved after a heat treatment at 1000°C for 4 h. Finally, the compositional variations appeared to have been linked to grain boundary melting during flash and consequent recrystallization as the sample cooled.
- Authors:
-
- Sabanci Univ., Istanbul (Turkey). Faculty of Engineering and Natural Sciences
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
- Jozef Stefan Inst. (IJS), Ljubljana (Slovenia). Nanostructured Materials
- Univ. of Colorado, Boulder, CO (United States). Dept. of Mechanical Engineering
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Sabanci Univ., Istanbul (Turkey)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Scientific and Technological Research Council of Turkey (TUBITAK) (Turkey)
- Contributing Org.:
- Jozef Stefan Inst. (IJS), Ljubljana (Slovenia); Univ. of Colorado, Boulder, CO (United States)
- OSTI Identifier:
- 1341678
- Report Number(s):
- BNL-113406-2017-JA
Journal ID: ISSN 1882-0743; R&D Project: 16060; 16060; KC0403020
- Grant/Contract Number:
- SC0012704; 1059B141300914
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Ceramic Society of Japan
- Additional Journal Information:
- Journal Volume: 124; Journal Issue: 4; Journal ID: ISSN 1882-0743
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Flash sintering; Ceramics; Center for Functional Nanomaterials; TEM: STEM-EDX; lead-free; core-shell
Citation Formats
Corapcioglu, Gulcan, Gulgun, Mehmet Ali, Kisslinger, Kim, Sturm, Saso, Jha, Shikhar K., and Raj, Rishi. Microstructure and microchemistry of flash sintered K0.5Na0.5NbO3. United States: N. p., 2016.
Web. doi:10.2109/jcersj2.15290.
Corapcioglu, Gulcan, Gulgun, Mehmet Ali, Kisslinger, Kim, Sturm, Saso, Jha, Shikhar K., & Raj, Rishi. Microstructure and microchemistry of flash sintered K0.5Na0.5NbO3. United States. https://doi.org/10.2109/jcersj2.15290
Corapcioglu, Gulcan, Gulgun, Mehmet Ali, Kisslinger, Kim, Sturm, Saso, Jha, Shikhar K., and Raj, Rishi. Sat .
"Microstructure and microchemistry of flash sintered K0.5Na0.5NbO3". United States. https://doi.org/10.2109/jcersj2.15290. https://www.osti.gov/servlets/purl/1341678.
@article{osti_1341678,
title = {Microstructure and microchemistry of flash sintered K0.5Na0.5NbO3},
author = {Corapcioglu, Gulcan and Gulgun, Mehmet Ali and Kisslinger, Kim and Sturm, Saso and Jha, Shikhar K. and Raj, Rishi},
abstractNote = {In this paper, flash sintering experiments were performed, for the first time, on sodium potassium niobate (KNN) ceramics. A theoretical density of 94% was achieved in 30 s under 250 V/cm electric-field at 990°C. These conditions are ~100°C lower and faster than the conventional sintering conditions. Grains tended to grow after 30 s. flash sintering duration under constant electric-field. Detailed microstructural and chemical investigations of the sample showed that there was inhomogenous Na, K distribution and it resembles a core–shell structure where K is more in the shell and Na is more in the core region. The inhomogenous distribution of Na and K was correlated with the doubling of the unit cell within the grain along 002 direction. Compositional equilibrium is achieved after a heat treatment at 1000°C for 4 h. Finally, the compositional variations appeared to have been linked to grain boundary melting during flash and consequent recrystallization as the sample cooled.},
doi = {10.2109/jcersj2.15290},
journal = {Journal of the Ceramic Society of Japan},
number = 4,
volume = 124,
place = {United States},
year = {Sat Apr 30 00:00:00 EDT 2016},
month = {Sat Apr 30 00:00:00 EDT 2016}
}
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