Publication Date:
2012-10-27
Description:
AgSbO 3 was doped into KNN-based lead-free piezoceramics with an optimized composition of Li 0.02 ( Na 0.53 K 0.48 ) 0.98 Nb 0.8 Ta 0.2 O 3 (abbreviated as LKNNT) to further enhance its piezoelectric property. The doping of AgSbO 3 was found to be effective in reducing the grain sizes, resulting in more uniform microstructure in AgSbO 3 -doped LKNNT ceramics. AgSbO 3 lowers tetragonal-orthorhombic phase transition point ( T T-O ), but with a more gentle rate as compared with other dopants. A large converse piezoelectric coefficient d 33 * up to 598 pm/V under a relatively low electric field of 1 kV/mm was obtained in the LKNNT-5 mol% AgSbO 3 composition, whose tetragonal-orthorhombic phase transition point ( T T-O ) was controlled near room temperature, but its Curie temperature was kept at 235°C. The d 33 * obtained in the present material is a very high value for nontextured KNN-based ceramics, which is attributed to the polymorphism phase transition effect and “soft” behavior caused by the addition of AgSbO 3 .
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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