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J. Korean Ceram. Soc. > Volume 58(2); 2021 > Article
Journal of the Korean Ceramic Society 2021;58(2): 225-235.
doi: https://doi.org/10.1007/s43207-020-00093-2
Phase evolution, microstructure and dielectric properties of electrospun Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3
Amir Mahdi Molavi, Parvin Alizadeh
Department of Materials Science and Engineering, Faculty of Engineering and Technology, Tarbiat Modares University, P. O. Box, 14115-143 Tehran, Iran
Correspondence  Parvin Alizadeh ,Email: p-alizadeh@modares.ac.ir
Received: August 24, 2020; Revised: October 16, 2020   Accepted: October 20, 2020.  Published online: March 31, 2021.
ABSTRACT
Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 or simply BZT-0.5BCT has attracted increasing attention due to its excellent ferroelectric properties and lack of lead. BZT-0.5BCT nanofibers were fabricated by sol–gel assisted electrospinning and post-calcination process. Different types of analysis were utilized to study phase evolutions and characterization of calcined fibers. TGA indicated three stages of polymer decomposition at temperatures below 500 °C. FTIR spectroscopy revealed the presence of acetate salts of inorganic precursors in electrospun fibers. Also, it was determined that the formation of oxides started at temperatures around 300 °C and intensified with a rise in temperature. In keeping with DSC and FTIR results, XRD analysis revealed a low crystallization temperature of 550 °C for the perovskite phase. The room-temperature Raman spectroscopy demonstrated the coexistence of both orthorhombic and tetragonal phases at 900 °C and higher temperatures. SEM images illustrated the stability of fibrous morphology up to 1000 °C. High-temperature XRD showed that the curie temperature of nanofibers is between 120 and 150 °C. The dielectric constant of calcined fibers at 900 °C was measured to be 2283.
Key words: Lead-free perovskite · Electrospinning · Nanofiber · BZT-0.5BCT · Phase evolution
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