Synthesis and characterization of nanocrystalline Barium Strontium Titanate powder via sol-gel processing

    Authors

    V. Somani;S. J. Kalita

    Comments

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    Abbreviated Journal Title

    J. Electroceram.

    Keywords

    Barium Strontium Titanate; nanopowder-synthesis; nano-electroceramics; sintering; sol-gel; TUNABLE DEVICE APPLICATIONS; THIN-FILMS; DIELECTRIC-PROPERTIES; CERAMICS; Materials Science, Ceramics

    Abstract

    Barium Strontium Titanate (BST) solid solution is a strong candidate material for application in tunable ferroelectric devices. In this research, we have synthesized and characterized nanocrystalline BST (Ba0.7Sr0.3TiO3) powder with average particle-diameter of 15 nm through a simple sol-gel process, using barium acetate, strontium acetate and titanium isopropoxide as the precursors. In this process, stoichiometric proportions of barium acetate and strontium acetate were dissolved in acetic acid followed by refluxing, and addition of titanium (IV) isopropoxide to form BST gel. The gel was analyzed using Differential Scanning Calorimetry (DSC) and Thermal Gravimetric Analysis (TGA). The as-formed gel was dried at 200 degrees C and then calcined in the temperature range of 400 to 800 degrees C for crystallization. Phase evolution during calcination was studied using X-ray diffraction (XRD) technique. Particle size, morphology and the lattice fringes of the calcined powder were characterized by high-resolution transmission electron microscopy (HR-TEM). To study the effects of sintering on BST nanopowder, green ceramic specimens were prepared by uniaxial compaction and then sintered at 950-1,100 degrees C under atmospheric conditions. Sintered specimens were analyzed for phase composition, grain size and geometric bulk density.

    Journal Title

    Journal of Electroceramics

    Volume

    18

    Issue/Number

    1-2

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    57

    Last Page

    65

    WOS Identifier

    WOS:000245888700008

    ISSN

    1385-3449

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