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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.
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    Temperature Dependent Electrical and Electrocaloric Properties of Textured 0.72PMN - 0.28PT Ceramics*
    (Taylor and Francis Ltd., 2021) Bobrek, Irem; Berksoy-Yavuz, Ayse; Kaya, M. Yunus; Alkoy, Sedat; Okatan, M. Baris
    Lead magnesium niobate (PMN) - lead titanate (PT) solid solution ceramics in the ratio of 0.72PMN-0.28PT was produced by a combination of tape-casting in ⟨001⟩pc textured and random forms. The Lotgering factor, f, of textured ceramics was approximately calculated as 80%. Modified Curie-Weiss analysis indicated relaxor dominant behavior for both the random and textured ceramics. Development of texture led to an enhancement in the electromechanical properties with converse piezoelectric charge coefficient (d33*) under 20 kV/cm electric field reaching 545 pm/V for the textured ceramic. Electrocaloric (EC) behavior of random and textured ceramics were obtained from indirect measurements using temperature dependent polarization vs. electric field hysteresis loops. An EC temperature change (ΔTEC) of ∼0.5 K was calculated from the PMN-28PT ceramics at around 80 °C under an electric field of 60 kV/cm. Development of texture was demonstrated to have led to an anisotropy in the EC response.