Synthesis of homogeneous (Na1-xKx)NbO3 nanorods using hydrothermal and post-heat treatment processes

Hai Bo Xu, Mi Ri Joung, Jin Seong Kim, Sahn Nahm, Min-Gyu Kang, Chong Yun Kang, Seok Jin Yoon

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

To synthesize (Na1-xKx)NbO3 nanorods, the Nb2O5-added (1-y)NaOH-yKOH specimens with 0.0≤y≤0.9 were heated at 160°C and subsequently annealed at 500°C. Homogeneous Na-rich (Na1-xKx)NbO3 nanorods were only synthesized for the specimen with y=0.15. However, NaNbO3 nanorods were formed for specimens with y<0.15, and K-rich (Na1-xKx)NbO3 nanoplates were obtained for specimens with y>0.2. The (Na8xK8-8x)Nb6O19{dot operator}nH2O transient phase was formed in the specimen with y=0.15 heated at 160°C for 8.0-12.0h, and this phase transformed into the Na-rich (Na1-xKx)NbO3 nanorods after annealing at 500°C. Therefore, the formation of a homogeneous (Na8xK8-8x)Nb6O19{dot operator}nH2O phase at a low temperature is very important for the synthesis of the (Na1-xKx)NbO3 nanorods. The (Na8xK8-8x)Nb6O19{dot operator}nH2O phase was considerably influenced by the heating temperature, and the processing time. The Na-rich (Na1-xKx)NbO3 nanorods have rectangular shape with various sizes, and the growth direction of these nanorods is [001].

Original languageEnglish (US)
Pages (from-to)16-21
Number of pages6
JournalChemical Engineering Journal
Volume211-212
DOIs
StatePublished - Nov 15 2012

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annealing
Nanorods
Heat treatment
heating
temperature
Annealing
Heating
Temperature
Processing

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Xu, H. B., Joung, M. R., Kim, J. S., Nahm, S., Kang, M-G., Kang, C. Y., & Yoon, S. J. (2012). Synthesis of homogeneous (Na1-xKx)NbO3 nanorods using hydrothermal and post-heat treatment processes. Chemical Engineering Journal, 211-212, 16-21. https://doi.org/10.1016/j.cej.2012.09.052
Xu, Hai Bo ; Joung, Mi Ri ; Kim, Jin Seong ; Nahm, Sahn ; Kang, Min-Gyu ; Kang, Chong Yun ; Yoon, Seok Jin. / Synthesis of homogeneous (Na1-xKx)NbO3 nanorods using hydrothermal and post-heat treatment processes. In: Chemical Engineering Journal. 2012 ; Vol. 211-212. pp. 16-21.
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abstract = "To synthesize (Na1-xKx)NbO3 nanorods, the Nb2O5-added (1-y)NaOH-yKOH specimens with 0.0≤y≤0.9 were heated at 160°C and subsequently annealed at 500°C. Homogeneous Na-rich (Na1-xKx)NbO3 nanorods were only synthesized for the specimen with y=0.15. However, NaNbO3 nanorods were formed for specimens with y<0.15, and K-rich (Na1-xKx)NbO3 nanoplates were obtained for specimens with y>0.2. The (Na8xK8-8x)Nb6O19{dot operator}nH2O transient phase was formed in the specimen with y=0.15 heated at 160°C for 8.0-12.0h, and this phase transformed into the Na-rich (Na1-xKx)NbO3 nanorods after annealing at 500°C. Therefore, the formation of a homogeneous (Na8xK8-8x)Nb6O19{dot operator}nH2O phase at a low temperature is very important for the synthesis of the (Na1-xKx)NbO3 nanorods. The (Na8xK8-8x)Nb6O19{dot operator}nH2O phase was considerably influenced by the heating temperature, and the processing time. The Na-rich (Na1-xKx)NbO3 nanorods have rectangular shape with various sizes, and the growth direction of these nanorods is [001].",
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Synthesis of homogeneous (Na1-xKx)NbO3 nanorods using hydrothermal and post-heat treatment processes. / Xu, Hai Bo; Joung, Mi Ri; Kim, Jin Seong; Nahm, Sahn; Kang, Min-Gyu; Kang, Chong Yun; Yoon, Seok Jin.

In: Chemical Engineering Journal, Vol. 211-212, 15.11.2012, p. 16-21.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synthesis of homogeneous (Na1-xKx)NbO3 nanorods using hydrothermal and post-heat treatment processes

AU - Xu, Hai Bo

AU - Joung, Mi Ri

AU - Kim, Jin Seong

AU - Nahm, Sahn

AU - Kang, Min-Gyu

AU - Kang, Chong Yun

AU - Yoon, Seok Jin

PY - 2012/11/15

Y1 - 2012/11/15

N2 - To synthesize (Na1-xKx)NbO3 nanorods, the Nb2O5-added (1-y)NaOH-yKOH specimens with 0.0≤y≤0.9 were heated at 160°C and subsequently annealed at 500°C. Homogeneous Na-rich (Na1-xKx)NbO3 nanorods were only synthesized for the specimen with y=0.15. However, NaNbO3 nanorods were formed for specimens with y<0.15, and K-rich (Na1-xKx)NbO3 nanoplates were obtained for specimens with y>0.2. The (Na8xK8-8x)Nb6O19{dot operator}nH2O transient phase was formed in the specimen with y=0.15 heated at 160°C for 8.0-12.0h, and this phase transformed into the Na-rich (Na1-xKx)NbO3 nanorods after annealing at 500°C. Therefore, the formation of a homogeneous (Na8xK8-8x)Nb6O19{dot operator}nH2O phase at a low temperature is very important for the synthesis of the (Na1-xKx)NbO3 nanorods. The (Na8xK8-8x)Nb6O19{dot operator}nH2O phase was considerably influenced by the heating temperature, and the processing time. The Na-rich (Na1-xKx)NbO3 nanorods have rectangular shape with various sizes, and the growth direction of these nanorods is [001].

AB - To synthesize (Na1-xKx)NbO3 nanorods, the Nb2O5-added (1-y)NaOH-yKOH specimens with 0.0≤y≤0.9 were heated at 160°C and subsequently annealed at 500°C. Homogeneous Na-rich (Na1-xKx)NbO3 nanorods were only synthesized for the specimen with y=0.15. However, NaNbO3 nanorods were formed for specimens with y<0.15, and K-rich (Na1-xKx)NbO3 nanoplates were obtained for specimens with y>0.2. The (Na8xK8-8x)Nb6O19{dot operator}nH2O transient phase was formed in the specimen with y=0.15 heated at 160°C for 8.0-12.0h, and this phase transformed into the Na-rich (Na1-xKx)NbO3 nanorods after annealing at 500°C. Therefore, the formation of a homogeneous (Na8xK8-8x)Nb6O19{dot operator}nH2O phase at a low temperature is very important for the synthesis of the (Na1-xKx)NbO3 nanorods. The (Na8xK8-8x)Nb6O19{dot operator}nH2O phase was considerably influenced by the heating temperature, and the processing time. The Na-rich (Na1-xKx)NbO3 nanorods have rectangular shape with various sizes, and the growth direction of these nanorods is [001].

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