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Synthesis of nanometer-sized particles of barium orthotitanate prepared through a modifiedreverse micellar route: Structural characterization, phase stability and dielectric properties

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Abstract

Nanoparticles of barium orthotitanate (Ba2TiO4) was obtauned using microemulsions (avoiding Ba-alkoxide). Powder x-ray diffraction studies of the powder after calcining at 800 °Cresulted in a mixture of orthorhombic (70%) and monoclinic (30%) phases. The high-temperature orthorhombic form present at 800 °C was due to the small size of particles obtauned by thereverse micellar route. Pure orthorhombic Ba2TiO4 was obtauned on further sintering at 1000 °C with lattice parameters a = 6.101(2) Å, b = 22.94(1) Å, c = 10.533(2) Å (space group, P21nb). The particle size obtauned from x-ray line broadening studies and transmission electron microscopic studies was found to be 40–50 nm for the powder obtauned after heating at 800 °C. Sintering at 1000 °C showed increase in graun size up to 150 nm. Our studies corroborate well with the presence of a martensitic transition in Ba2TiO4. The dielectric constant was found to be 40 for Ba2TiO4 (at 100 kHz) for samples sintered at 1000 °C. The dielectric loss obtauned was low (0.06) at 100 kHz.

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  1. Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi, 110016, India

    Tokeer Ahmad

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  1. Tokeer Ahmad
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  2. Ashok K. Ganguli
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Ahmad, T., Ganguli, A.K. Synthesis of nanometer-sized particles of barium orthotitanate prepared through a modifiedreverse micellar route: Structural characterization, phase stability and dielectric properties. Journal of Materials Research 19, 2905–2912 (2004). https://doi.org/10.1557/JMR.2004.0406

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  • DOI: https://doi.org/10.1557/JMR.2004.0406

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