Publication Date:
2013-07-13
Description:
Nb and Mn were doped, respectively, to 0.8 Pb ( Sn 0.46 Ti 0.54 ) O 3 –0.2 Pb ( Mg 1/3 Nb 2/3 ) O 3 (PST–PMN) to improve electrical properties for meeting the requirement in various fields. The additions of Nb and Mn influence in a pronounced way the structure, and improve the densities of the ceramics. Nb -doped PST–PMN increased the piezoelectric coefficient d 33 , planar electromechanical coupling k p , and relative dielectric constant ε, indicating “soft” piezoelectric behavior. Mn doping played a “hard” part, which significantly enhanced the mechanical quality factor Q m without deteriorating other piezoelectric properties. The most excellent properties of Nb -doped PST–PMN were obtained with doping amount of 0.75 mol%, specifically d 33 , k p , being on the order of 455 pC/N, 57.5% and 3560, respectively. The addition of 0.75 mol% Mn for PST–PMN presented the optimum electrical properties, with Q m of 554, d 33 of 430 pC/N, k p of 57.0%, ε of 2770. It was proposed that the addition of Nb , Mn generated different defect dipoles involved in the domain walls motion and intrinsic piezoelectric responses, leading to different effects on electrical properties.
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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