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...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.展开更多
基金Supported by the National Science Fund for Distinguished Young Scholars of China(21225625)the National Natural Science Foundation of China(21176087)the Specialized Research Fund for the Doctoral Program of Higher Education(20110172110013)
文摘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.
