NDLI: Effects of substitution on electrical properties of (Bi/sub 1/2/Na/sub 1/2/)TiO/sub 3/-based lead-free ferroelectrics

Content Provider	IEEE Xplore Digital Library
Author	Nagata, H. Takenaka, T.
Copyright Year	2000
Description	Author affiliation: Fac. of Sci. & Technol., Sci. Univ. of Tokyo, Chiba, Japan (Nagata, H.)
Abstract	Dielectric, ferroelectric and piezoelectric properties of bismuth sodium titanate, (Bi/sub 1/2/Na/sub 1/2/)TiO/sub 3/ (BNT) were studied on some additive dopants for a candidate as lead-free piezoelectric ceramics. Electromechanical coupling factors, k/sub 33/ in the longitudinal mode of BNT ceramics depend on the purity of starting raw materials and additive dopants. The k/sub 33/ for high and normal purities are 0.38 and 0.43, respectively. It is considered that impurities in starting materials are influence on piezoelectric properties. In the case of Mn addition, the Curie temperature, T/sub c/, decreases rapidly with increasing amount of doped MnCO/sub 3/, and the resistivity, /spl rho/, is enhanced to 3/spl times/10/sup 14/ (/spl Omega/cm) (at 40/spl deg/C) for BNT+MnCO/sub 3/ 0.2 (wt.%). In the case of Nb addition, Nb/sup 5+/ ions substitute for Ti/sup 4+/ ions as a donor. The k/sub 33/ (=0.42) of Nb-doped BNT ceramics are larger than that of undoped BNT ceramic (=0.28) under the condition of the low poling field (E/sub p/=5 kV/mm). In the case of Fe addition, Fe /sup 3+/ ions substitute for Ti/sup 4+/ ions as a acceptor. The k/sub 33/ (=0.18) of Fe-doped BNT ceramics are smaller than that of undoped BNT ceramic (E/sub p/=5 kV/mm).
Starting Page	45
Ending Page	51
File Size	472833
Page Count	7
File Format	PDF
ISBN	0780359402
ISSN	10994734
DOI	10.1109/ISAF.2000.941510
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-07-21
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bismuth Ceramics Additives Niobium Iron Dielectrics Ferroelectric materials Titanium compounds Environmentally friendly manufacturing techniques Raw materials
Content Type	Text
Resource Type	Article

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