Effect of nickel-niobium co-doping on structural, electromechanical, and dielectric properties of lead titanate ceramics

• Published in: IEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 56; no. 9; pp. 1792 - 1798
• Main Authors: Amarande, L., Miclea, C., Tanasoiu, T., Iuga, A., Cioangher, M.C., Trupina, L., Grecu, M.-N., Pasuk, I.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.09.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Anisotropic magnetoresistance; Ceramics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric properties of solids and liquids; Dielectrics; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Doping; Exact sciences and technology; Lattices; Physics; Softening; Titanium compounds; Dielectric properties; Lead titanates; Tetragonal crystals; Doping; Titanium; Niobium additions; Coupling factor; Ceramics; Nickel additions; Electromechanical properties
• DOI: 10.1109/TUFFC.2009.1251
• ISSN: 0885-3010

Lead titanate (PT) ceramics co-doped with 8 to 13 mol% Ni-Nb, by substituting titanium ions, were prepared by conventional ceramic method and the influence of Ni-Nb doping level on their mopho-structural, electromechanical and dielectric properties was investigated. Dense tetragonal PT ceramics were obtained for 8 to 12 mol% Ni-Nb co-doping. Lattice anisotropy decreased from 1.053 to 1.046 with increasing doping level. Large thickness coupling factors of 0.4 were obtained for 8, 11, and 12 mol% Ni-Nb. Large electromechanical anisotropy of 10 was obtained for 8 mol% Ni-Nb. It was found that Ni-Nb co-doping has both softening and hardening effects as a function of donor or acceptor behavior of different amounts of Ni-Nb. For 13 mol% Ni-Nb, segregation of a small amount of a secondary phase occurs, lattice constants and tetragonality significantly decrease and the resulting ceramic becomes very hard.