Oxygen ionic transport in Bi2O3-based oxides: II. The Bi2O3–ZrO2–Y2O3 and Bi2O3–Nb2O5–Ho2O3 solid solutions |
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| Authors: | Aleksey A Yaremchenko Vladislav V Kharton Evgeny N Naumovich Anneta A Tonoyan Viktor V Samokhval |
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| Institution: | (1) Institute of Physicochemical Problems, Belarus State University, 14 Leningradskaya Str., 220080, Minsk, Republic of Belarus Tel.: +375-17-2207681; Fax: +375-17-2264696; e-mail: kharton@fhp.bsu.unibel.by or nen@basnet.minsk.by, |
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| Abstract: | Electrical conductivity, fluorite-type cubic unit cell volume and thermal expansion of the (Bi1−
x
Nb
x
)1−
y
Ho
y
O1.5+δ (x=0.05 and 0.08; y=0.10−0.15) and (Bi1−
x
Zr
x
)1−
y
Y
y
O1.5+δ (x=0.05 and 0.07; y=0.15) solid solutions have been found to decrease regularly with increasing dopant content. Annealing at temperatures below
900 K leads to a phase decomposition and to a sharp decrease in conductivity of the ceramics. Oxygen ion transference numbers
have been determined by the e.m.f. method and by Faradaic efficiency measurement to exceed 0.9. A new technique of studying
Faradaic efficiency has been proposed and verified using (Bi0.95Zr0.05)0.85Y0.15O1.5+δ and Zr0.90Y0.10O1.95 ceramic samples.
Received: 31 October 1997 / Accepted: 18 December 1997 |
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| Keywords: | Oxygen ionic conductivity Bismuth oxide Transference numbers Faradaic efficiency Thermal expansion |
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