Improved ferroelectric properties of bismuth titanate films by Nd and Mn cosubstitution
Improved ferroelectric properties of bismuth titanate films by Nd and Mn cosubstitution
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DOI：
10.1063/1.2430630
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发表时间：
2007-01
影响因子：
4
通讯作者：
Zhong Xiangli;J. Wang;Lizhong Sun;Congbing Tan;Xiaojing Zheng;Y. Zhou
中科院分区：
文献类型：
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作者：
Zhong Xiangli;J. Wang;Lizhong Sun;Congbing Tan;Xiaojing Zheng;Y. Zhou
Nd和Mn共取代的钛酸铋薄膜，即，采用化学溶液沉积技术在Pt scinTi scinSiO 2 scinSi（100）衬底上制备了Bi3.15Nd0.85（Ti 3 −xMnx）O 12（BNTM）（x=0，0.005，0.01，0.03，0.05和0.1）。利用X射线衍射和拉曼光谱分析了薄膜的结构。这些薄膜具有（117）和（00 l）择优取向的多晶结构。系统地研究了BNTM薄膜的铁电性能与Mn含量的关系。研究发现，在Bi3.15Nd0.85Ti3O12中进行低浓度的锰离子取代，大大提高了薄膜的剩余极化强度（2 Pr），降低了薄膜的矫顽场（2 Ec）。2 Pr和2 Ec分别为78μ Cscincm ~ 2和205 kVscincm。当x=0.01时，BNTM薄膜在1.5× 10 ~（10）次开关循环中没有出现疲劳现象。
Thin films of Nd and Mn cosubstituted bismuth titanate, i.e., Bi3.15Nd0.85(Ti3−xMnx)O12 (BNTM) (x=0, 0.005, 0.01, 0.03, 0.05, and 0.1), were fabricated on Pt∕Ti∕SiO2∕Si(100) substrates at 700°C by a chemical solution deposition technique. The structures of the films were analyzed using x-ray diffraction and Raman spectroscopy. These films possessed preferred (117) and (00l)-oriented polycrystalline structures. The ferroelectric properties of BNTM films were systematically investigated as a function of the Mn content. It is found that a low concentration substitution with manganese ions in Bi3.15Nd0.85Ti3O12 greatly enhances the remnant polarization (2Pr) and reduces the coercive field (2Ec) of the film. The 2Pr and 2Ec are 78μC∕cm2 and 205kV∕cm, respectively. No fatigue phenomenon is also observed for the BNTM film with x=0.01 up to 1.5×1010 switching cycles.