Three dimensional representations of partial ionic and electronic conductivity based on defect structure analysis of BaZr0.85Y0.15O3-δ

Title
Three dimensional representations of partial ionic and electronic conductivity based on defect structure analysis of BaZr0.85Y0.15O3-δ
Authors
지호일김병국유지행최성민김혜령손지원이해원이종호
Keywords
BaZrO3; Defect structure; Proton condcting oxide; Partial conductivity; Transference number
Issue Date
2011-11
Publisher
Solid state ionics
Citation
VOL 203, NO 1, 9-17
Abstract
The defect structure of BaZr0.85Y0.15O3−δ was systematically analyzed as functions of oxygen and water vapor activity at the temperature where the grain boundary resistance becomes negligible for defect-chemical analyses. AC impedance spectroscopy was used to differentiate the grain and grain boundary contribution on total electrical conductivity. A thermo-gravimetric analysis was employed to estimate the equilibrium constant of hydration reaction as well as the concentrations of ionic charge carriers, protons and oxygen vacancies. Total electrical conductivity was measured by a DC 4-probe method at 800 °C over a range of aO2 from 10−25 to 1 and aH2O from 10−4.5 to 10−1.6 and was analyzed via a non-linear simultaneous fitting method based on previously obtained proton and oxygen vacancy concentrations, to represent the corresponding partial ionic and electronic conductivities in the form of f(aO2,aH2O) within a three dimensional space. Transference numbers of each mobile charge carrier are also presented into the three-dimensional form.
URI
http://pubs.kist.re.kr/handle/201004/40697
ISSN
0167-2738
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE