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    Characterization of 1-3 piezocomposites from PNN-PZT piezoceramics
    (Elsevier Science Sa, 2023) Yalcin, Ezgi; Gozuacik, Namik Kemal; Alkoy, Sedat; Sari, Huseyin Alptekin; Kaya, Mustafa Yunus; Oncel, Cinar; Mensur, Ebru
    Piezocomposite materials combine best properties of components while minimizing their disadvantages to provide desired properties. This study reports on piezocomposites with 1-3 connectivity prepared from 0.5Pb (Ni1/3Nb2/3)O3-0.5Pb(Zr0.3Ti0.7)O3 (0.5PNN-0.5PZT) fibers and polyurethane matrix. The PNN-PZT powder was synthesized by solid-state reaction method. PNN-PZT green fibers were drawn using the alginate gelation method. Dense sintered fibers with 500-800 mu m diameter were embedded in an ordered arrangement in a polyurethane passive matrix. Structural, electrical and electroacoustic properties of PNN-PZT piezocomposite and bulk ceramic were both reported. Bulk PNN-PZT ceramics were found to have properties that are superior than the commercial soft PZT counterparts. The maximum TVR value was measured as 142.5 dB at 444 kHz for the piezocomposite, corresponding to the thickness mode resonance. The FFVS response with 3 dB variation had an average FFVS value of - 210 dB between 250 and 450 kHz band for the piezocomposite.
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    Effect of texture on ultra-high strain behavior in eco-friendly NBT-0.25ST ceramics using NBT template
    (Wiley, 2024) Berksoy-Yavuz, Ayse; Kaya, Mustafa Yunus; Yalcin, Ezgi; Gozuacik, Namik Kemal; Mensur, Ebru
    <001> oriented textured (Na0.5Bi0.5Ti)O-3-0.25SrTiO(3) (NBT-0.25ST) system was fabricated using 10 mol% plate-like NBT template particles to enhance the electrical properties. Random and textured samples were prepared by a tape-casting method. Lotgering factor for textured sample was calculated as 88%. Dielectric values of the samples were comparable, and this means texturing using NBT samples of this orientation did not change the dielectric constant. The maximum unipolar strain values of random and textured NBT-0.25ST systems were found to be as similar to 0.09% and similar to 0.59%, respectively. This current study emphasizes the significant difference in maximum unipolar strain values between the random and textured versions of the NBT-0.25ST system, indicating the superiority of the textured material in terms of responsiveness to the electric field. The FOM under high electric fields of textured and random NBT-0.25ST was found to increase almost 45-fold compared with random case.