鉛無し圧電セラミックス(Bi_<0.5>Na_<0.5>)TiO_3-Ba(Zr_<0.04>Ti_<0.96>)O_3の圧電と誘電特性

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Lead-free piezoelectric ceramics (1-x) (Bi_<0.5>Na_<0.5>) TiO_<3-x>Ba (Zr_<0.04>Ti_<0.96>) O_3 (abbreviated as BNT-BZT100x, with x ranged from 2 to 10 mol%) have been investigated. The samples were prepared by a conventional sintering technique. Effect of amount of BZT on the electrical properties and microstructures of BNT-BZT lead-free piezoelectric ceramic were examined. The X-ray diffraction (XRD) patterns shows that incorporated BZT diffuses into the BNT lattice to form a solid solution during sintering, but changes the crystal structure from rhombohedral to tetragonal symmetry at higher BZT amounts. The measurements of piezoelectric properties reveal that BNT-BZT6 ceramics has highest piezoelectric performance: the piezoelectric constant d_<33> reached to 168pC/N and planar electromechanical coupling factor k_p enhanced to 0.27. The morphotropic phase boundary (MPB) between BNT (rhombohedral) and Ba(Zr_<0.04>Ti_<0.96>) O_3 (tetragonal) should be near the BNT-BZT6 composition.
2006-10-01