Structure and Electric Properties of (1-x)(Bi1/2Na1/2) TiO3-xBaTiO3 Systems |
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引用本文: | 刘云飞,吕忆农.Structure and Electric Properties of (1-x)(Bi1/2Na1/2) TiO3-xBaTiO3 Systems[J].武汉理工大学学报(材料科学英文版),2007,22(2):315-319. |
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作者姓名: | 刘云飞 吕忆农 |
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作者单位: | College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China |
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摘 要: | The structural, dielectric and piezoelectric properties of (1-x)(Bi1/2Na1/2) TiO3-xBaTiO3 ceramics were investigated for the compositional range, x=0.02, 0.04, 0.06, 0.08, 0.10. The samples were synthesized by a conventional solid-state reaction technique. All compositions show a single perovskite structure, and X-ray powder diffraction patterns can be indexed using a rhombohedral structure. Lattice constants and lattice distortion increase while the amount of BaTiO3 increases. The X-ray diffraction results show the morphotropic phase boundary (MPB) of (1-x)(Bi1/2Na12) TiO3-xBaTiO3 exists in near x=0.06-0.08. Temperature dependence of dielectric constant eT33/ε0 measurement reveals that all compositions experience one structural phase and two ferroelectric phases transition below 400℃: rhombohedral (or rhombohedral plus tetragonal) ferroelectric phase ←→ tetragonal antiferroelectric phase ←→ tetragonal paraelectric phase. Relaxor behaviors exist in the course of ferroelectric to antiferroelectric phase transition. Dielectric and piezoelectric properties are enhanced in the MPB range for ( 1-x)(Bi1/2Na1/2)TiO3-xBaTiO3.
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关 键 词: | BNBT系压电陶瓷 结构 介电性能 压电性能 钛酸铋钠 |
收稿时间: | 12 June 2005 |
修稿时间: | 2005-06-122006-07-11 |
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