Electron holographic studies of irradiation damage in BaTiO3
Electron holographic studies of irradiation damage in BaTiO3
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DOI：
10.1088/0957-4484/15/9/036
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发表时间：
2004-09
期刊：
影响因子：
3.5
通讯作者：
Takahisa Yamamoto;T. Hirayama;K. Fukunaga;Y. Ikuhara
中科院分区：
文献类型：
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作者：
Takahisa Yamamoto;T. Hirayama;K. Fukunaga;Y. Ikuhara
用电子全息技术研究了BaTiO_3粒子在电子束辐照下的荷电现象。在透射电子显微镜中证实，BaTiO_3粒子在插入后立即被电子辐照带电。然而，在透射电子显微镜中，电子辐照产生的电荷量随着辐照时间的延长而减少。辐照1.5h后，电荷损失约为初始状态的一半。这意味着粒子的电阻率在辐照后降低。此外，这种由辐照引起的电阻率降低过程被证实是一个不可逆反应。由此可以得出这样的结论：电阻率的降低是由于辐照产生了氧空位。电子辐照技术可以被认为是一种新的BaTiO_3基材料电导率的改性方法。
Using an electron holographic technique, we investigated the charging-up phenomena of BaTiO3 particles under electron beam irradiation. BaTiO3 particles were confirmed to be charged up by electron irradiation just after insertion in a transmission electron microscope (TEM). However, the amount of the electric charge induced by electron irradiation was found to decrease by further irradiation in a TEM. After irradiating for 1.5 h, about half of the electrical charge was lost compared with that in the initial state. This implies that the electric resistivity of the particle decreased upon irradiation. In addition, this reduction process of the resistivity due to irradiation was confirmed to be an irreversible reaction. It could be concluded that the reduction of resistivity is attributed to the generation of oxygen vacancies due to the irradiation. The electron irradiation technique can be considered to be a new modification method of conductivity in BaTiO3-based materials.