Effect of sintering aid (CoO) on transport properties of nanocrystalline Gd doped ceria (GDC) materials prepared by co-precipitation method

Title
Effect of sintering aid (CoO) on transport properties of nanocrystalline Gd doped ceria (GDC) materials prepared by co-precipitation method
Authors
Ashok Kumar Baral다사리하리김병국이종호
Keywords
SOFC; Ionic conductivity; Dielectric loss tangent; Defect pairs; Association energy; Migration energy; Grain boundary conductivity
Issue Date
2013-10
Publisher
Journal of alloys and compounds
Citation
VOL 575, 455-460
Abstract
Electrical and dielectric properties of the nanocrystalline GDC materials co-doped with CoO (by deposition precipitation method) were studied in the temperature range of 150–600 °C. CoO co-doped samples show higher grain interior conductivity than that of GDC. Dielectric loss tangent (tan δ) shows the presence of defect associates such as (Co-Vo-Co) and (Co-Vo) in co-doped samples in addition to the defects (Gd-Vo-Gd) and (Gd-Vo) that are present in GDC system. Dynamic parameters such as migration energy and association energy of oxygen vacancies do not vary significantly with co-doping CoO in the GDC materials. With higher content of CoO, excess of Co2+ in the grain boundary regions leads to trapping of vacancies and/or depletion of vacancies in the space charge region. Therefore grain boundary activation energy increases and grain boundary conductivity decreases with CoO content above 1 mol%, at lower temperatures. In the temperature range of 150–600 °C overall conductivities in CoO co-doped samples increase two to three times than that of GDC material.
URI
http://pubs.kist.re.kr/handle/201004/46129
ISSN
09258388
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KIST Publication > Article
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