| Thermogravimetric Study on Oxygen Adsorption/Desorption Properties of Double Perovskite Structure Oxides REBaCo2O（5＋δ）（RE= Pr,Gd,Y） |
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| 引用本文： | 郝好山,郑路,王颖芳,刘世江,胡行.Thermogravimetric Study on Oxygen Adsorption/Desorption Properties of Double Perovskite Structure Oxides REBaCo2O（5＋δ）（RE= Pr,Gd,Y）[J].中国稀土学报(英文版),2007,25(3):275-281. |
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| 作者姓名： | 郝好山 郑路 王颖芳 刘世江 胡行 |
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| 作者单位： | School of Physical Engineering and Material Physics Laboratory,Zhengzhou University,Zhengzhou 450052,China |
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| 基金项目： | Project supported by the Natural Science Foundation of Henan Province （0511053400） |
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| 摘 要： | The oxygen adsorption/desorption properties of double perovskite structure oxides PrBaCo2O5＋δ,GdBaCo2O5＋δ,and YBaCo2O5＋δ were investigated by the thermogravimetry（TG）method in the temperature range of 400~900 ℃.The calculated oxygen adsorption/desorption surface reaction rate constants ka and kd of these double perovskite structure oxides were larger than the commonly used cubic perovskite oxides,such as Ba0.95Ca0.05Co0.8Fe0.2O3-δ and Ba0.5Sr0.5Co0.8Fe0.2O3-δ,whereas,the oxygen permeation flux was comparable to that of the latter,which was attributed to the smaller difference of oxygen vacancy in oxygen and nitrogen atmosphere（Δδ/Vmol）in these double perovskite structure oxides.The large oxygen adsorption/desorption rate constants of GdBaCo2O5＋δ and PrBaCo2O5＋δ made them nice catalyst coating materials,on other membrane surfaces,to improve the oxygen permeability.
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| 关 键 词： | 热重量分析法 稀土 氧吸附作用 解吸作用 |
| 文章编号： | 1002-0721（2007）03-0275-07 |
| 收稿时间： | 10 October 2006 |
| 修稿时间： | 2006-10-102007-03-11 |
Thermogravimetric Study on Oxygen Adsorption/Desorption Properties of Double Perovskite Structure Oxides REBaCo2 O5+δ (RE = Pr, Gd, Y) |
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| Hao , Zheng Lu, Wang Yingfang, Liu Shijiang,Hu Xing,.Thermogravimetric Study on Oxygen Adsorption/Desorption Properties of Double Perovskite Structure Oxides REBaCo2 O5+δ (RE = Pr, Gd, Y)[J].Journal of Rare Earths,2007,25(3):275-281. |
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| Authors: | Hao Zheng Lu Wang Yingfang Liu Shijiang Hu Xing |
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| Affiliation: | School of Physical Engineering and Material Physics Laboratory, Zhengzhou University, Zhengzhou 450052, China |
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| Abstract: | The oxygen adsorption/desorption properties of double perovskite structure oxides PrBaCo2O5+δ, GdBa-Co2O5+δ and YBaCo2O5+δ were investigated by the thermogravimetry (TG) method in the temperature range of 400  900 °C. The calculated oxygen adsorption/desorption surface reaction rate constants ka and kd of these double perovskite structure oxides were larger than the commonly used cubic perovskite oxides, such as Ba0.95Ca0.05Co0.8Fe0.2O3-δ and Ba0.5 Sr0.5Co0.8Fe0.2O3-δ, whereas, the oxygen permeation flux was comparable to that of the latter, which was attributed to the smaller difference of oxygen vacancy in oxygen and nitrogen atmosphere (δδ/Vmol) in these double perovskite structure oxides. The large oxygen adsorption/desorption rate constants of GdBaCo2O5+δ and PrBaCo2O5+δ made them nice catalyst coating materials, on other membrane surfaces, to improve the oxygen permeability. |
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| Keywords: | thermogravimetry REBaCo2O5+δ oxygen adsorption/desorption rare earthsCLC number: TG 115 25 TQ 113 3 |
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