• DocumentCode
    1919738
  • Title

    Large anisotropy on electromechanical properties of rare-earth and alkaline-earth oxides complex modified PbTiO3 ceramics

  • Author

    Wang, H. ; Xue, W.R. ; Lu, P.N. ; Shen, D.W. ; Zhang, Q.T. ; Zhao, M.Y.

  • Author_Institution
    Dept. of Silicate Eng., Nanjing Inst. of Chem. Technol., China
  • fYear
    1992
  • fDate
    30 Aug-2 Sep 1992
  • Firstpage
    548
  • Lastpage
    550
  • Abstract
    The dielectric and piezoelectric properties, the microstructural development and the crystal structures of (Pb0.88-xGd0.08Mex(Ti0.98Mn 0.02) O3+y(Sb2O3+Nb2 O5)wt.% (x=0-20 mol.%., 0<y<1.5, Me=Ca, Ba or Sr)) were investigated. It was found that the content of the alkaline-earth ions strongly influenced the electromechanical properties of the samples. When Me=15 mol.%, the optimum properties were Kt =55%, Kp=0, Kt/Kp→Ω, Q m=60, ε33T/ε0<250, tan δ<1.5%, and d33=70×10-12 c/N. The effects of the poling electric field on those properties were studied. SEM (scanning electron microscopy) and XRD (X-ray diffraction) revealed that the ceramic microstructure clearly changed and that tetragonality (c/a) decreased due to the Me ion doping. It is suggested that both the microstructure and crystal structure are responsible for this behavior. The lower c/a ratio and the microstructure with wide grain boundaries and greater porosity can lead to an increase of the domains parallel to the poling electric field, and hence improve the electromechanical properties
  • Keywords
    X-ray diffraction examination of materials; antimony compounds; ceramics; dielectric losses; dielectric polarisation; grain boundaries; infrared spectra of inorganic solids; lead compounds; niobium compounds; permittivity; piezoelectric materials; porosity; scanning electron microscope examination of materials; IR spectra; PbGdBaTiO3MnO3-Sb2O3 -Nb2O5; PbGdCaTiO3MnO3-Sb2O3 -Nb2O5; PbGdSrTiO3MnO3-Sb2O3 -Nb2O5; SEM; X-ray diffraction; XRD; alkaline-earth oxides; ceramic microstructure; crystal structures; dielectric constant; dielectric loss; dielectric properties; electromechanical anisotropy; electromechanical properties; grain boundaries; piezoelectric properties; piezoelectricity; polarisation; poling electric field; porosity; rare-earth oxides; scanning electron microscopy; tetragonality; Anisotropic magnetoresistance; Ceramics; Crystal microstructure; Dielectrics; Doping; Grain boundaries; Scanning electron microscopy; Strontium; X-ray diffraction; X-ray scattering;
  • fLanguage
    English
  • Publisher
    ieee
  • Conference_Titel
    Applications of Ferroelectrics, 1992. ISAF '92., Proceedings of the Eighth IEEE International Symposium on
  • Conference_Location
    Greenville, SC
  • Print_ISBN
    0-7803-0465-9
  • Type

    conf

  • DOI
    10.1109/ISAF.1992.300569
  • Filename
    300569
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1919738