Ceramics-Silikáty 55 (2) 195-197 (2011)

Oxygen behavior in Y_1-xZr_xBaCo₄O_7+δ

S. Zhang, H. Song, J. Jia, D. Yang, H. Sun, X. Hu

Y_1-xZr_xBaCo₄O_7+δ (x = 0.0, 0.05, 0.1, 0.2, 0.4, 0.6) samples were synthesized by the solid state reaction method. The effects of Zr substitution for Y on the oxygen uptake/release properties of these samples were investigated by thermogravimetric (TG) from room temperature to 1150°C. The results show that there exists an optimizing Zr doping amount. The Y_0.9Zr_0.1BaCo₄O_7+δ sample can uptake more oxygen than the undoped YBaCo₄O_7+δ sample at 360°C. Especially, in an oxygen uptake/release cycles between 340°C and 410°C, the mass change of the doped Y_0.9Zr_0.1BaCo₄O_7+δ sample can reach 5.3 % of its original mass and show a stable oxygen uptake/release reproducibility. In addition, in the oxygen uptake/release cycles switched between oxygen and nitrogen atmosphere at 350°C, Y_0.9Zr_0.1BaCo₄O_7+δ can also adsorb more oxygen. These properties of Y_1-xZr_xBaCo₄O_7+δ make them to be a potential candidate in the field of gas purification and separation.

Keywords: Y_1-xZr_xBaCo₄O_7+δ; Thermogravimetric; Oxygen-storage; Gas separation