Microstructural observations in (Na0.5K0.5)NbO 3 ceramics with CuO and ZnO additives

Young Heon Kim, Hyun Ryu, Yang Koo Cho, Hwack Joo Lee, Sahn Nahm

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The characterizations of CuO and ZnO pockets which had formed in (Na 0.5K0.5)NbO3 (NKN) matrix sintered at 920 °C with CuO of 1.5 mol% and ZnO of 1.5 and 3.0 mol% as the additives were investigated from a microstructural point of view using transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). Two types of pockets, composed of CuO and ZnO as a dominant component, were observed in the microstructure as new microstructure constituents. The abnormal grain growth has occurred by the liquid phase sintering. The pockets were melted partially or completely by the interactions with element Na in the matrix which has formed a eutectic compound whose melting point is lower than the sintering temperature. The reaction starts at the interfaces between the pocket and matrix and the kinetics depends not only on the size of the pocket but also on the environments where the pockets are located. When the additive content of ZnO was increased to 3.0 mol %, there are interactions between CuO and ZnO and both elements are found in the compound pocket. The sintering kinetics was much enhanced by the presence of both additives.

Original languageEnglish
Article number031501
JournalJapanese Journal of Applied Physics
Volume52
Issue number3 PART 1
DOIs
Publication statusPublished - 2013 Mar 1

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Sintering
ceramics
Liquid phase sintering
Microstructure
Kinetics
sintering
matrices
Grain growth
Eutectics
liquid phase sintering
Melting point
Energy dispersive spectroscopy
microstructure
kinetics
Transmission electron microscopy
eutectics
melting points
interactions
electron energy
transmission electron microscopy

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Microstructural observations in (Na0.5K0.5)NbO 3 ceramics with CuO and ZnO additives. / Kim, Young Heon; Ryu, Hyun; Cho, Yang Koo; Lee, Hwack Joo; Nahm, Sahn.

In: Japanese Journal of Applied Physics, Vol. 52, No. 3 PART 1, 031501, 01.03.2013.

Research output: Contribution to journalArticle

Kim, Young Heon ; Ryu, Hyun ; Cho, Yang Koo ; Lee, Hwack Joo ; Nahm, Sahn. / Microstructural observations in (Na0.5K0.5)NbO 3 ceramics with CuO and ZnO additives. In: Japanese Journal of Applied Physics. 2013 ; Vol. 52, No. 3 PART 1.
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