Crystal growth and ferroelectric property of Na0.5K0.5NbO3 and Mn-doped Na0.5K0.5NbO3 crystals grown by floating zone method
Crystal growth and ferroelectric property of Na0.5K0.5NbO3 and Mn-doped Na0.5K0.5NbO3 crystals grown by floating zone method
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DOI：
10.1016/j.jeurceramsoc.2009.05.050
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发表时间：
2010
影响因子：
5.7
通讯作者：
Y. Inagaki;K. Kakimoto;I. Kagomiya
中科院分区：
文献类型：
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作者：
Y. Inagaki;K. Kakimoto;I. Kagomiya
采用浮区法（FZ）生长了无铅压电材料的候选材料Na0.5K0.5NbO3（NKN）和Mn掺杂的NKN晶体。将所得晶体生长与先前研究中使用助熔剂方法产生的晶体生长进行比较。在FZ法生长的晶体中，当生长速率控制在3 mm/h时，形成了与生长方向平行和垂直的薄层。在通过FZ法生长的晶体中，晶体结构不能分类为具有Amm 2的正交晶格，这在使用助熔剂法生长的晶体中观察到。结果表明，掺杂Mn取代了NKN的钙钛矿型晶格。纯的NKN晶体显示具有锯齿形形状的90°畴，而Mn掺杂的NKN晶体以直线与畴层对齐。证实了Mn掺杂的NKN晶体具有正方形的P-E磁滞回线。
Na0.5K0.5NbO3(NKN) and Mn-doped NKN crystals, which are one of the promising candidates of lead-free piezoelectric materials, were grown by using a floating zone (FZ) method. The resulting crystal growth was compared with crystal growth that resulted from using a flux method in a previous study. In the crystal grown by FZ method under where the growth rate was controlled to 3mm/h, thin layers formed parallel and perpendicular directions to the growth direction. In the crystal grown by FZ method, the crystal structure could not be classified as having the orthorhombic lattice of Amm2, which was observed in the crystal grown using a flux method. It was found that doped Mn was substituted in the perovskite-type lattice of NKN. Pure NKN crystals showed 90° domains that had a zig-zag shape, whereas Mn-doped NKN crystals were aligned to the domain layers in straight lines. It was confirmed that Mn-doped NKN crystal showed a square P–E hysteresis loop.