Ferroelectric and piezoelectric properties of fine-grained Na0.5K0.5NbO3 lead-free piezoelectric ceramics prepared by spark plasma sintering
Ferroelectric and piezoelectric properties of fine-grained Na0.5K0.5NbO3 lead-free piezoelectric ceramics prepared by spark plasma sintering
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DOI：
10.1111/j.1551-2916.2005.00743.x
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发表时间：
2006-02-01
影响因子：
3.9
通讯作者：
Zhang, LM
中科院分区：
文献类型：
--
作者：
Li, JF;Wang, K;Zhang, LM
由于人们对环境保护的兴趣日益增加，无铅压电陶瓷受到了广泛的关注。以NaNbO_3和KNbO_3为代表的Nb_2O_3系无铅压电陶瓷已被研究，但其烧结致密化难度较大。本研究采用放电等离子烧结技术(SPS)制备了高致密的Na0.5K0.5NbO_3陶瓷。虽然SPS温度低至920℃，但Na0.5K0.5NbO3固溶体陶瓷的密度提高到4.47g/cm(3)(>；99%的理论密度)。Na0.5K0.5NbO_3陶瓷在空气中后退火后，获得了较好的铁电和压电性能。Na_(0.5)K_(0.5)NbO_3的晶相为正交结构。居里温度为395℃，Na0.5K0.5NbO_3陶瓷的压电参数d(33)达到148pC/N。
Lead-free piezoelectric ceramics have received attention because of increasing interest in environmental protection. Niobate ceramics such as NaNbO3 and KNbO3 have been studied as promising Pb-free piezoelectric ceramics, but their sintering densification is fairly difficult. In the present study, highly dense Na0.5K0.5NbO3 ceramics were prepared using spark plasma sintering (SPS). Although the SPS temperature was as low as 920 degrees C, the density of the Na0.5K0.5NbO3 solid solution ceramics was raised to 4.47 g/cm(3) (> 99% of the theoretical density). After post-annealing in air, reasonably good ferroelectric and piezoelectric properties were obtained in the Na0.5K0.5NbO3 ceramics with submicron grains. The crystal phase of the Na0.5K0.5NbO3 has an orthorhombic structure. The Curie temperature is 395 degrees C and the piezoelectric parameter (d(33)) of the Na0.5K0.5NbO3 ceramics reached 148 pC/N.