Defect structure and morphology of alkali niobate (Na0.5K 0.5)NbO3 powder calcined under low oxygen partial pressure

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

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Abstract

The effects of oxygen partial pressure (pO2) in the calcination process of perovskite (Na0.5K0.5)NbO3 (NKN) are investigated in terms of morphology and defect structure. Ceramic powders calcined in low-pO2 atmospheres exhibit cubic-shaped particles with smaller mean diameter. The tail of the absorption edge in UV-visible diffuse reflectance spectra becomes smaller at low-pO2 atmospheres in the calcination process, implying the suppression of alkali vacancies. The smaller powder size and lower concentration of alkali vacancies in low-pO 2-calcined powder improves the sinterability, thereby leading to higher resistivity. Therefore, the low-pO2 calcination is an essential process for NKN-based piezoelectrics.

Original languageEnglish (US)
Article number101502
JournalApplied Physics Express
Volume6
Issue number10
DOIs
StatePublished - Oct 1 2013

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All Science Journal Classification (ASJC) codes

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

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