首页> 外文会议>Special issue on the 19th symposium on dielectric and advanced matter physics amp; the 11th workshop on high dielectric and ferroelectric device and materials >A-site Non-stoichiometry Effects on the Dielectric and the Piezoelectric Properties of Pb-free (Na0.50+xLi0.03+yK0.47)(Nb0.8Ta0.2)O3 Ceramics
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A-site Non-stoichiometry Effects on the Dielectric and the Piezoelectric Properties of Pb-free (Na0.50+xLi0.03+yK0.47)(Nb0.8Ta0.2)O3 Ceramics

机译:A位非化学计量对无铅(Na0.50 + xLi0.03 + yK0.47)(Nb0.8Ta0.2)O3陶瓷的介电和压电性能的影响

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The effects of A-site non-stoichiometry were investigated in (Na0.50+xLi0.03+yK0.47) (Nb0.8Ta0.2) O3 (NLKNT) piezoelectric ceramics prepared by using a solid state reaction method. The content of Na was controlled to be -0.04 < x < +0.04 while the content of Li was controlled to be -0.02 < y < +0.02. A perovskite structure was maintained at all compositions although an impurity phase started forming in the case of x < 0 and y = 0. A polymorphic phase transition temperature between the orthorhombic and the tetragonal phases (To-t) was observed to vary with both Na and Li non-stoichiometry. The highest piezoelectric coefficient ((d33) of 200 pC/N was obtained in the case of x — 0 and y = +0.01, for which To-t was around room temperature.
机译:在通过固相反应法制备的(Na0.50 + xLi0.03 + yK0.47)(Nb0.8Ta0.2)O3(NLKNT)压电陶瓷中研究了A位非化学计量的影响。将Na的含量控制为-0.04 <x <+0.04,同时将Li的含量控制为-0.02 <y <+0.02。尽管在x <0和y = 0的情况下开始形成杂质相,但在所有组成下都保持了钙钛矿结构。观察到正交相和四方相之间的多态相变温度(To-t)均随Na的变化而变化。和李非化学计量。在x_0和y = + 0.01的情况下,当To-t在室温附近时,可获得最高的压电系数((d33)为200pC / N。

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