Negative real permittivity in (Bi0.3Eu0.7)Sr2CaCu2O6.5 ceramic
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Dosyalar
Tarih
2020
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Bi0.3Eu0.7Sr2CaCu2O6.5 was prepared by solid-state reaction method and characterized by Scanning Electron Microscope, X-Ray Fluorescence, X-Ray Diffraction, and electron spin resonance measurements. The frequency dependences of the real and imaginary parts of ac impedance and complex permittivity along with ac conductivity of the sample were studied in 1 Hz-40 MHz range for 296-433 K by an impedance analyzer. The ac impedance analyses of the sample at different temperatures pointed out the possible usage of the material in temperature sensor applications. The negative real permittivity (NRP) was observed at 353 K and the higher temperatures operated. Additionally, it was observed that the cross over frequency, where the real permittivity changes its sign from positive to negative, increases gradually with increasing temperature. The origin of the temperature-induced negative permittivity was discussed in the context of the Drude model and plasma oscillations. Ultimately, Bi0.3Eu0.7Sr2CaCu2O6.5 ceramics can be suggested as source material for NRP.
Açıklama
Anahtar Kelimeler
Bi-Based Perovskite, Rare Earth Element, Negative Real Permittivity, Dielectric Spectroscopy
Kaynak
Physica B-Condensed Matter
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
584