Negative real permittivity in (Bi0.3Eu0.7)Sr2CaCu2O6.5 ceramic

Dielectric and Optical Properties of Eux(Bi1-x)Sr2CaCu2O6.5 (x=0.3 and 1) Samples

“…In this context, Eu-based copper oxide materials have not only negative dielectric constant (NDC) but also high dielectric constant depending on mole ratio of Eu elements in the sample and temperatures operating. Eu-123 [21] and (Eu 0.7 Bi 0.3 )Sr 2 CaCu 2 O 6.5 coded as (Eu 0.7 Bi 0.3 )-212 [4] ceramics belonging to the Eu-based copper oxide family have the NDC. Eu-123 sample was investigated at room temperature under the magnetic field varying from 0-0.4 T as shown in Figure 1 [21].…”

“…Negative real permittivity for (Eu 1 Bi 0 )-212 material was observed at temperature with 373 K and higher temperatures and below than the cross over frequency with 14 Hz as shown in Figure 4. It was determined that substitution of europium for bismuth in the stoichiometric ratio higher than 0.5 enables negative real permittivity at temperatures of 353 K and above [4].…”

“…In the literature, dielectric properties of some materials doped with europium such as europium trioxide doped lead boro-tellurite glasses [1], (Eu,Ca)Cu 3 Ti 4 O 12 ceramics [2], Eu 2 O 3 -doped calcium copper titanium oxide samples [3] having with giant and positive real dielectric constant were investigated by researchers. Z.Güven Özdemir and her research group were studied dielectric properties of Eu x (Bi 1-x )Sr 2 CaCu 2 O 6.5 ceramics (where x=0, 0.3, 0.5, 0.7) between 1 Hz and 40 MHz from room temperature to 433 K for the first time [4,5]. Also, the research group determined the dielectric properties of EuBa 2 Ca 2 Cu 3 O 9−x (Eu-1223) and EuBa 2 Cu 3 O 7+x (Eu-123) samples [4,5].…”

“…Z.Güven Özdemir and her research group were studied dielectric properties of Eu x (Bi 1-x )Sr 2 CaCu 2 O 6.5 ceramics (where x=0, 0.3, 0.5, 0.7) between 1 Hz and 40 MHz from room temperature to 433 K for the first time [4,5]. Also, the research group determined the dielectric properties of EuBa 2 Ca 2 Cu 3 O 9−x (Eu-1223) and EuBa 2 Cu 3 O 7+x (Eu-123) samples [4,5]. In this article, real dielectric constants of the materials investigated by Güven Özdemir and et al were reviewed in details.…”

Bazalt/PANI Kompozitlerinin Dielektrik Özelliklerinin Tahmini için Makine Öğrenmesi Modellerinin Karşılaştırılması

“…Buna bağlı olarak elektriksel ve mekanik özellikleri ve bu özelliklerinin iyileştirilmesine yönelik çok sayıda araştırma yapılmaktadır. Özellikle polimer kompozitlerin dielektrik özellikleri üzerine yapılan çalışmalar dikkat çekicidir (Kılıç, 2020;Kılıç, Özdemir, Karabul, Karataş, & Çataltepe, 2020;Moez A. A., 2012).…”