Cobalt-free gadolinium-doped perovskite Gd_xBa_(1-x)FeO_(3-δ) as high-performance materials for oxygen separation

高性能材料无钴钆掺杂钙钛矿Gd_xBa_(1-x)FeO_(3-δ)用于氧分离（英文）

Cobalt-free oxides GdxBal-xFeO3-σas（0.01 _〈 x _〈 0.1 ） were achieved by a solid state reaction method. It is found that GdxBal-xFeO3-σas（0.025 _〈 x _〈 0.1） exhibits the cubic perovskite structure. Among GdxBal-xFeO3-σas （0.025 -〈 x -〈 0.1 ）, the GdxBal-xFeO3-σas （GBF2.5） membrane shows the outstanding phase structure stability and the highest oxygen permeation, which can reach 1.44 ml. cm- 2. rain- 1 at 950 ℃ under air/He oxygen partial pressure gradient. The GBF2.5 membrane was successfully operated for more than 100 h at 800 ℃ and the oxygen permeation flux through the membrane is 0.62 ml. cm- 2. rain- 1. After 100 h oxygen permeation experiment at 800℃, X-ray diffraction （XRD） and energy dispersive X-ray spectrometer （EDXS） demonstrate that the GBF2.5 exhibits phase structure stability even at intermediate temoerature.

Cobalt-free oxides Gd_xBa_(1-x)FeO_(3-δ)(0.01≤x≤0.1) were achieved by a solid state reaction method.It is found that Gd_xBa_(1-x)FeO_(3-δ)(0.025 ≤ x ≤ 0.1) exhibits the cubic perovskite structure.Among Gd_xBa_(1-x)FeO_(3-δ)(0.025 ≤ x ≤ 0.1),the Gd_(0.025)Ba_(0.975)FeO_(3-δ)(GBF2.5) membrane shows the outstanding phase structure stability and the highest oxygen permeation,which can reach 1.44 ml·cm^(-2)·min^(-1) at 950℃ under air/He oxygen partial pressure gradient.The GBF2.5 membrane was successfully operated for more than 100 h at 800℃ and the oxygen permeation flux through the membrane is 0.62 ml·cm^(-2)·min^(-1).After 100 h oxygen permeation experiment at800℃,X-ray diffraction(XRD) and energy dispersive X-ray spectrometer(EDXS) demonstrate that the GBF2.5exhibits phase structure stability even at intermediate temperature.