Fuel-free low-temperature self-combustion synthesis and characterization of praseodymium-substituted bismuth titanate ceramics

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  • KRENGVIRAT Warapong
    School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia Faculty of Engineering, Burapha University
  • SREEKANTAN Srimala
    School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia
  • MOHD NOOR Ahmad-Fauzi b.
    School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia
  • MATSUDA Atsunori
    Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology
  • CHINWANITCHAROEN Charoen
    Faculty of Engineering, Burapha University

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This paper presents the preparation of bismuth titanate (Bi4Ti3O12; BIT) and praseodymium-substituted bismuth titanate (Bi4−xPrxTi3O12: BPT) with various molarities of praseodymium ion (Pr3+: x = 0.2, 0.6 and 1.0) via a fuel-free low-temperature self-combustion synthesis process (FLSC). FLSC offers a remarkable ability to produce polycrystalline BIT powder with an orthorhombic structure, and BPT powder with a tetragonal structure. The substitution of Pr3+ into the BIT system retarded the crystal growth, as revealed by the decrease in the crystallite size from 106 to 41 nm by incorporating Pr3+ with x = 1.0. Besides, the substitution caused the structure transformation from platelet-like structure to aquiaxed structure. Such structure provides an essential role to enhance the ceramic density. High relative density of about 99.3% was achieved for the BPT ceramic compared to BIT ceramic with a relative density of 89.7%. The results underline the possibility to control the anisotropic grain growth of BIT ceramic by incorporating Pr3+ into the BIT system through FLSC. The ceramic sintered at 1100°C exhibited high dielectric permittivity (269.38) with a low dissipation factor as low as 0.00203.

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