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Enhanced Sintering of Yttrium‐Doped Barium Zirconate by Addition of ZnO
Author(s) -
Babilo Peter,
Haile Sossina M.
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00449.x
Subject(s) - zirconate , materials science , sintering , barium , yttrium , barium oxide , dielectric spectroscopy , oxide , ceramic , thermogravimetric analysis , inorganic chemistry , analytical chemistry (journal) , chemical engineering , metallurgy , chemistry , electrode , titanate , engineering , electrochemistry , chromatography
The influence of transition metal oxides additives, especially zinc oxide, on the densification and electrical properties of doped barium zirconate have been examined. With the use of zinc oxide as a sintering aid, BaZr 0.85 Y 0.15 O 3–δ was readily sintered to above 93% of theoretical density at 1300°C. Scanning electron microscopic investigations showed Zn accumulation in the intergranular regions. Thermogravimetric analysis of the material under flowing CO 2 showed ZnO‐modified barium zirconate to exhibit excellent chemical stability. The conductivity, as measured by A.C. impedance spectroscopy under H 2 O saturated nitrogen, was slightly lower than that of unmodified barium zirconate. Electromotive force measurements under fuel cell conditions revealed the total ionic transport number to be ∼0.9 at 600°C. The combination of electrical and chemical properties and good sinterability render ZnO‐modified barium zirconate an excellent candidate for reduced temperature solid oxide fuel cell applications.