TY - GEN
T1 - New opportunity in alkali niobate ceramics processed in low oxygen partial pressure
AU - Kobayashi, Keisuke
AU - Randall, Clive A.
AU - Ryu, Minoru
AU - Doshida, Yutaka
AU - Mizuno, Youichi
PY - 2012/10/31
Y1 - 2012/10/31
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84867907921&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84867907921&partnerID=8YFLogxK
U2 - 10.1109/ISAF.2012.6297768
DO - 10.1109/ISAF.2012.6297768
M3 - Conference contribution
AN - SCOPUS:84867907921
SN - 9781467326681
T3 - 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
BT - 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
T2 - 2012 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
Y2 - 9 July 2012 through 13 July 2012
ER -