Preparation of Protonic Conductor BaZr0.5Ce0.3Ln0.2O3-δ (Ln=Y, Sm, Gd, Dy) by using a Solid State Reactive Sintering Method

ISSN 1121-7588

Junfu Bu¹, Pär G. Jönsson¹, Zhe Zhao^1,2
¹Department of Materials Science and Engineering, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
²Department of Materials Science and Engineering, Shanghai Institute of Technology, 201418 Shanghai, China

Abstract

Protonic conductors of BaZr_0.5Ce_0.3Ln_0.2O_3-δ (BZCLn532, Ln=Y, Sm, Gd, Dy) were successfully synthesized by using a cost-effective solid state reactive sintering (SSRS) method with 1 wt.% NiO as a sintering aid. The pellets of the BZCLn532 were obtained at sintering temperatures between 1300 - 1600 ℃. The results show that the morphologies and the final relative densities of the obtained BZCLn532 pellets are influenced significantly when different sintering temperatures were applied. Dense pellets of the BZCLn532 can be obtained at sintering temperatures of 1600 ℃ for BaZr_0.5Ce_0.3Y_0.2O_3-δ and 1400 ℃ for BaZr_0.5Ce_0.3Sm_0.2O_3-δ, BaZr_0.5Ce_0.3Gd_0.2O_3-δ and BaZr_0.5Ce_0.3Dy_0.2O_3-δ. The ionic conductivity results show that the BaZr_0.5Ce_0.3Y_0.2O_3-δ (BZCY532) and BaZr_0.5Ce_0.3Dy_0.2O_3-δ (BZCD532) ceramics are demonstrated to be good candidates of oxygen ion conductor and proton conductor materials for intermediate temperature solid oxide fuel cells (ITSOFCs) applications.

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