| 用正电子湮没研究钙钛矿结构压电陶瓷中的点缺陷 |
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| 引用本文： | 何元金,马兴坤,桂治轮,李龙土.用正电子湮没研究钙钛矿结构压电陶瓷中的点缺陷[J].物理学报,1998,47(1):146-153. |
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| 作者姓名： | 何元金 马兴坤 桂治轮 李龙土 |
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| 作者单位： | (1)清华大学材料科学与工程系，北京 100084; (2)清华大学现代应用物理系，北京 100084 |
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| 基金项目： | 国家自然科学基金资助的课题. |
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| 摘 要： | 用正电子湮没寿命谱技术对有意掺杂的或被杂质替代的钙钛矿结构压电陶瓷中的点缺陷进行了研究.掺杂了La3+的PbTiO3，掺杂了Sr2+，Cd2+和La3+的Pb(Mg1/3Nb2/3)0.375Ti0.375Zr0.25O3，掺杂了Ca2+的BaT
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| 关 键 词： | 钙钛矿结构 正电子湮没 压电陶瓷 点缺陷 |
| 收稿时间： | 1997-05-14 |
POINT DEFECT STUDIES ON PEROVSKITE STRUCTURED PIEZOELECTRIC CERAMICS USING POSITRON ANNIHILATION |
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| HE YUAN-JIN,MA XING-KUN,GUI ZHI-LUN and LI LONG-TU.POINT DEFECT STUDIES ON PEROVSKITE STRUCTURED PIEZOELECTRIC CERAMICS USING POSITRON ANNIHILATION[J].Acta Physica Sinica,1998,47(1):146-153. |
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| Authors: | HE YUAN-JIN MA XING-KUN GUI ZHI-LUN and LI LONG-TU |
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| Abstract: | A systematic investigation of different types of lattice defects in intentionally doped or impurity substituted piezoelectric ceramics was carried out by using positron annihilation.La3+ doped PbTiO3,Sr2+,Cd2+,and La3+ doped Pb (Mg1/3Nb2/3)0.375Ti0.375Zr0.25O3;Ca2+ doped BaTiO3; and Nb5+ doped SrTiO3 were chosen as testing materials.It was found that positrons can be traped by cation vacancies,oxygen vacancies,as well as defects associated with lattice deformations,but with different dynamic specific trapping rates and annihilation characteristics.A new possible method for determining the defect species in perovskite structured piezoelectric ceramics is presented. |
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