Structure and Dielectric Properties of Pure and Zinc Oxide-Doped Barium Titanate

    Volume 2, Issue 1

    ISSN: 2165-3992

    CODEN: MPCOAD

    Published Online: 31 May 2013

    Page Count: 9


    Hasan, M. M.
    Dept. of Materials and Metallurgical Engineering, Bangladesh Univ. of Engineering and Technology, BUET, Lalbagh, Dhaka

    Shorowordi, K. M.
    Dept. of Materials and Metallurgical Engineering, Bangladesh Univ. of Engineering and Technology, BUET, Lalbagh, Dhaka

    (Received 3 January 2013; accepted 29 April 2013)

    Abstract

    The effects of zinc oxide addition and sintering parameters on the structure and dielectric properties of barium titanate are observed. Different percentage of ZnO ranging from 0.30 to 1 wt. % is doped in barium titanate. Both the doped and undoped samples are sintered at temperatures ranging from 1250°C to 1325°C at different soaking times. The amount of densification of the doped and undoped samples is measured in terms of percentage theoretical density. Grain size and microstructural analysis is performed by a scanning electron microscope (SEM). Lattice parameters and tetragonality of doped and undoped barium titanate are calculated from x-ray diffraction pattern obtained from x-ray diffractometer (XRD) test. Dielectric properties of the samples are measured by an impedance analyzer. It is found that all the doped samples obtain their maximum percentage theoretical density at a lower sintering temperature compared to the undoped sample. SEM study reveals that the doped samples always show smaller grains compared to the undoped sample. Significant grain growth is observed in all of the samples at sintering temperatures above 1300°C. The evidence of surface melting is observed in 1 wt. % ZnO-doped sample soaked at 1325°C for 2 h. The presence of liquid at that sintering condition is explained by the doping mechanism of Zn2+ in BaTiO3. Correlation among the grain size, tetragonality, and dielectric properties of the doped and undoped samples are also discussed.


    Paper ID: MPC20130001

    DOI: 10.1520/MPC20130001

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    Author
    Title Structure and Dielectric Properties of Pure and Zinc Oxide-Doped Barium Titanate
    Symposium , 0000-00-00
    Committee C28