title: Effect of nickel-niobium co-doping on structural, electromechanical, and dielectric properties of lead titanate ceramics.
abstract: 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 morpho-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.
authors.affiliation: National Institute of Materials Physics, Bucharest-Magurele, Romania. amarande@infim.ro
authors.forename: Luminita
authors.initials: L
authors.lastname: Amarande
authors.forename: Cornel
authors.initials: C
authors.lastname: Miclea
authors.forename: Teodora
authors.initials: T
authors.lastname: Tanasoiu
authors.forename: Alin
authors.initials: A
authors.lastname: Iuga
authors.forename: Marius Cristian
authors.initials: MC
authors.lastname: Cioangher
authors.forename: Lucian
authors.initials: L
authors.lastname: Trupina
authors.forename: Maria-Nicoleta
authors.initials: MN
authors.lastname: Grecu
authors.forename: Iuliana
authors.initials: I
authors.lastname: Pasuk