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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, Ayşe; Kaya, Mustafa Yunus; Yalçın, Ezgi; Gözüaçık, Namık 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.
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    Fabrication of 0.94NBT-0.06BT textured ceramics using plate-like NBT templates and their electrical properties
    (Springer, 2022) Berksoy Yavuz, Ayşe; Kaya, Mustafa Yunus; Avcı, Tubanur; Çakırbaş, Gizem; Mensur, Ebru
    The effect of crystallographic texture on the properties of 0.94(Na0.5Bi0.5TiO3)-0.06BaTiO(3) (0.94NBT-0.06BT) ceramics were investigated in this study. The optimized rectangular plate-like Na0.5Bi0.5TiO3 (NBT) templates synthesized by a three-step molten salt method were used for the texturing. Dimensions of the major surfaces of the templates which were parallel to the (001) planes were measured as 8.4 mu m x 10 mu m (length x width) and 1 mu m thickness on the average. The green textured ceramics were fabricated by tape casting method and then sintered. All ceramics were crystallized in pure perovskite structure and the degree of grain orientation was calculated as f = 91%. Brick wall-like microstructure for the textured NBT-BT ceramics with average grain size of similar to 12 mu m was obtained by scanning electron microscopy. Depolarization temperature (T-d) and temperature of maximum (T-m) of the dielectric permittivity were determined as 119 degrees C and 341 degrees C at 10 kHz for the textured ceramic, respectively. The value of maximum dielectric permittivity of textured ceramics was measured as epsilon(rmax) similar to 5409 at 10 kHz. The high field (@50 kV/cm) piezo-electric d(33)* value was increased from 239 to 412 pm/V by texturing of the 0.94NBT-0.06BT ceramics. NBT template addition and texture development led to a decrease in AC conductivity.