New opportunity in alkali niobate ceramics processed in low oxygen partial pressure

Keisuke Kobayashi, Clive A. Randall, Minoru Ryu, Yutaka Doshida, Youichi Mizuno

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

Alkali niobate ceramics, such as (Na 0.5K 0.5)NbO 3, has been considered as a promising candidate for lead free piezoelectrics and been a subject of growing interest. We focused on the effects of low oxygen partial pressure (pO 2) firing of alkali niobate ceramics, and found that piezoelectric and dielectric properties are essentially independent of the firing atmosphere. Furthermore, low pO 2 firing provides better electrical resistivity and microstructure than air firing, which can be explained by the fact that alkali volatilization is suppressed in low pO 2 firing condition. This opens new opportunities for base meal cofired multilayer applications in the alkali niobate perovskite system. We also found that low pO 2 fired NaNbO 3-NaTaO 3 solid state ceramic exhibited a much higher resistivity than conventional ferroelectric ceramics such as BaTiO 3, and also showed relatively high permittivity at high temperatures up to 250°C, which make this ceramic promising as a capacitor material for the expanding high temperature.

Original languageEnglish (US)
Title of host publicationProc. of 2012 21st IEEE International Symposium on Applications of Ferroelectrics Held Jointly with 11th IEEE European Conference on the Applications of Polar Dielectrics and IEEE, ISAF/ECAPD/PFM 2012
DOIs
StatePublished - Oct 31 2012
Event2012 21st IEEE Int. Symp. on Applications of Ferroelectrics Held with 11th IEEE European Conf. on Applications of Polar Dielectrics and 4th IEEE Int. Symp on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials, ISAF/ECAPD/PFM - Aveiro, Portugal
Duration: Jul 9 2012Jul 13 2012

Publication series

NameProceedings of 2012 21st IEEE Int. Symp. on Applications of Ferroelectrics held jointly with 11th IEEE European Conference on the Applications of Polar Dielectrics and IEEE PFM, ISAF/ECAPD/PFM 2012

Other

Other2012 21st IEEE Int. Symp. on Applications of Ferroelectrics Held with 11th IEEE European Conf. on Applications of Polar Dielectrics and 4th IEEE Int. Symp on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials, ISAF/ECAPD/PFM
CountryPortugal
CityAveiro
Period7/9/127/13/12

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All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

Kobayashi, K., Randall, C. A., Ryu, M., Doshida, Y., & Mizuno, Y. (2012). New opportunity in alkali niobate ceramics processed in low oxygen partial pressure. In Proc. of 2012 21st IEEE International Symposium on Applications of Ferroelectrics Held Jointly with 11th IEEE European Conference on the Applications of Polar Dielectrics and IEEE, ISAF/ECAPD/PFM 2012 [6297768] (Proceedings of 2012 21st IEEE Int. Symp. on Applications of Ferroelectrics held jointly with 11th IEEE European Conference on the Applications of Polar Dielectrics and IEEE PFM, ISAF/ECAPD/PFM 2012). https://doi.org/10.1109/ISAF.2012.6297768