The influence of the partially europium substitution on the AC electrical properties of BiSr2CaCu2O6.5 ceramics

Processing and Application of Ceramics

Seda Erdönmez¹  Orhan Içelli¹  Mehmet Kılıç¹  Yasar Karabul¹  Zeynep Güven Özdemir¹ 

[1] Department of Physics, Faculty of Arts and Sciences, Yildiz Technical University, 34220, Davutpasa, Esenler, Istanbul, Turkey;

关键词: solid state synthesis;    eu substituted bisr2cacu2o6.5;    dielectric properties;    impedance spectroscopy;   

DOI  :  10.2298/PAC1904323O

来源: DOAJ

【 摘 要 】

In this work, EuxBi1-xSr2CaCu2O6.5 (where x = 0, 0.3, 0.5) samples were prepared by solid-state reaction method and sintered at 950 °C for 24 h. The structural characterizations were done by X-ray diffraction, X-ray fluorescence, scanning electron microscope and Fourier transformed infrared spectroscopy. The thermal stability of the samples was also analysed by thermogravimetric TG and DTA measurements. It was shown that Eu0.5Bi0.5Sr2CaCu2O6.5 sample exhibited high dielectric constant and low dielectric loss relative to BiSr2CaCu2O6.5 material. Thus, the dielectric loss was lowered by heavy rare earth metal substitution on Bi-Sr-Ca-Cu-O ceramics while the dielectric constant still remained high. Temperature-dependent complex electrical modulus spectra obtained between 296 and 433 K also revealed the temperature-activated relaxation process in the materials which can be attributed to the Maxwell-Wagner type polarization effect. Ultimately, it was suggested that the Eu0.5Bi0.5Sr2CaCu2O6.5 ceramics may have a promising potential for applications which require high dielectric constant with a low dielectric loss.

【 授权许可】

Unknown