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| Synthesis and piezoelectric properties of (Na0.5Bi0.5)TiO3--BaTiO3 |
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| 武汉理工大学 |
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Cite this article:
;. Synthesis and piezoelectric properties of (Na0.5Bi0.5)TiO3--BaTiO3. Chin J Mater Res, 2004, 18(5): 524-528.
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Abstract (Na$_{0.5}$Bi$_{0.5}$)$_{1-x}$Ba$_{x}$TiO$_{3}$ fine powders were synthesized by a
citrate method. The piezoelectric properties of
(Na$_{0.5}$Bi$_{0.5}$)$_{1-x}$Ba$_{x}$TiO$_{3}$ ceramics were investigated.
The results show that the mole ratio of citric acid to total metal cation content
(C/M$^{n+}$) and pH value of precursor solution are main contributing factors to
the formation of sol and gel. The fine powders with a pure perovskite structure can
be obtained from the gel by calcining at 600℃. The powders synthesized by the
citrate method exhibit fine morphology and high chemical homogeneity, thus enhancing
the piezoelectric properties of (Na$_{0.5}$Bi$_{0.5}$)$_{1-x}$Ba$_{x}$TiO$_{3}$
ceramics. (Na$_{0.5}$Bi$_{0.5}$)$_{1-x}$Ba$_{x}$TiO$_{3}$ ceramics with the
compositions near the morphotropic phase boundary (MPB) show superior piezoelectric
properties due to the existence of more spontaneous polarization directions.
A high piezoelectric constant $d_{33}$ of 180 pC/N was obtained for
(Na$_{0.5}$Bi$_{0.5}$)$_{1-x}$Ba$_{x}$TiO$_{3}$ ceramics when $x$=0.06.
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Received: 05 November 2004
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