Phase stability and electric conductivity of Eu2O3-Tb4O7 co-doped Bi2O3 electrolyte
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Tarih
2015
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Pergamon-Elsevier Science Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, eight different samples of Tb4O7 and Eu2O3 co-doped Bi2O3 were prepared by solid-state synthesis techniques. (Bi2O3)(1-x-y)(Tb4O7)(x)(Eu2O3)(y) (x = 5,10; y = 5, 10, 15, 20 mol %) ternary systems were investigated by using X-ray powder diffraction (XRD), differential thermal analysis/thermal gravimetry (DTA/TG), and four-point probe techniques (4PPT). Effect of concentration of doping elements on the temperature and electrical conductivity was investigated. All samples were evaluated by calculating activation energies and average crystal sizes. XRD measurements show that five samples have a single phase (phase) structure. According to electrical conductivity measurements, the conductivity increases with increasing temperature but decreases with increasing amount of Eu2O3. The highest ionic conductivity was measured as 7.28 x 10(-1) (ohm.cm)(-1) for the (Bi2O3)(0.90)(Tb4O7)(0.05) (Eu2O3)(0.05) sample at 850 degrees C and the lowest activation energy was measured as 0.64 eV for (Bi2O3)(0.90)(Tb4O7)(0.05) (Eu2O3)(0.05). Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Açıklama
Anahtar Kelimeler
Solid oxide fuel cell (SOFC), Ceramic electrolyte, X-ray diffraction, 4-point probe technique
Kaynak
International Journal of Hydrogen Energy
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
40
Sayı
30
