Structure and electric properties of (1−x)(Bi1/2Na1/2) TiO3-xBaTiO3 Systems

Yunfei Liu; Yinong Lv; Ming Xu; Shuzhe Shi; Hanqiao Xu; Xiaodong Yang

doi:10.1007/s11595-005-2315-4

Journal of Wuhan University of Technology Materials Science Edition ›› 2007, Vol. 22 ›› Issue (2) : 315 -319. DOI: 10.1007/s11595-005-2315-4

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Structure and electric properties of (1−x)(Bi_1/2Na_1/2) TiO₃-xBaTiO₃ Systems

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Abstract

The structural, dielectric and piezoelectric properties of (1−x)(Bi_1/2Na_1/2) 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)(Bi_1/2Na_1/2) TiO₃-xBaTiO exists in near x=0.06−0.08. Temperature dependence of dielectric constant ɛ ^T ₃₃/ɛ ₀ measurement reveals that all compositions experience one structural phase and two ferroelectric phases transition below 400 °C: 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)(Bi_1/2Na_1/2)TiO₃-xBaTiO₃.

Keywords

bismuth sodium titanate / morphotropic phase boundary / relaxor / electric property

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Yunfei Liu, Yinong Lv, Ming Xu, Shuzhe Shi, Hanqiao Xu, Xiaodong Yang. Structure and electric properties of (1−x)(Bi_1/2Na_1/2) TiO₃-xBaTiO₃ Systems. Journal of Wuhan University of Technology Materials Science Edition, 2007, 22(2): 315-319 DOI:10.1007/s11595-005-2315-4

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