Advantages of low partial pressure of oxygen processing of alkali niobate: NaNbO3

Hiroyuki Shimizu, Keisuke Kobayashi, Youichi Mizuno, Clive A. Randall

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

This work focused on the processing of low oxygen partial pressure (low-pO2) calcination and sintering with respect to NaNbO3 (NN) of one key member in ferroelectric (Na,K)NbO3. The high-density NN ceramics were successfully prepared without any sintering additives using the low-pO2 process. Comparing conventional air process, the low-pO2 calcined NN powders showed lower defect concentration and higher densification. The low-pO2 sintered NN ceramics had dielectric constant and dielectric loss performance at high temperatures. Furthermore, the low-pO2 sintered NN ceramics indicated ferroelectric behavior, and both maximum polarization and strain improved to two to three times that of conventional air-sintered NN ceramics. From this relatively simple compound, NN, the advantage of low-pO2 is unambiguously demonstrated and points to its consideration. It is hypotheses as a kinetically controlled process that limits the volatility under low-pO2 condition.

Original languageEnglish (US)
Pages (from-to)1791-1796
Number of pages6
JournalJournal of the American Ceramic Society
Volume97
Issue number6
DOIs
StatePublished - Jun 2014

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Alkalies
Partial pressure
Sintering
Oxygen
Ferroelectric ceramics
Dielectric losses
Processing
Air
Densification
Calcination
Ferroelectric materials
Permittivity
Polarization
Powders
Defects
Temperature
sodium niobate

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Shimizu, Hiroyuki ; Kobayashi, Keisuke ; Mizuno, Youichi ; Randall, Clive A. / Advantages of low partial pressure of oxygen processing of alkali niobate : NaNbO3. In: Journal of the American Ceramic Society. 2014 ; Vol. 97, No. 6. pp. 1791-1796.
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Advantages of low partial pressure of oxygen processing of alkali niobate : NaNbO3. / Shimizu, Hiroyuki; Kobayashi, Keisuke; Mizuno, Youichi; Randall, Clive A.

In: Journal of the American Ceramic Society, Vol. 97, No. 6, 06.2014, p. 1791-1796.

Research output: Contribution to journalArticle

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AU - Randall, Clive A.

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