Transport properties of Ba3Ca1+xNb2-xO9-δ composite perovskite oxides
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摘要: 高温质子导体固体电解质Ba3Ca1+xNb2-xO9-δ化学性质稳定,中低温电导率较高,具有较好的应用前景。采用固相合成法制备得到了复合钙钛矿相的Ba3Ca1+xNb2-xO9-δ(x=0、0.10、0.18、0.30)材料。随着Ca掺杂量的增加Ba3Ca1+xNb2-xO9-δ样品的电导率先增加后降低,x=0.18的样品电导率最高。Ba3Ca1+xNb2-xO9-δ材料在含氢中的电子空穴迁移数较低,当温度低于750°C时,材料中质子导电为主;当温度达800°C后,材料中氧离子导电为主。Ca掺杂量x=0.10的样品质子迁移数最高,随着掺杂量的增加样品氧离子迁移数逐渐增大,质子迁移数逐渐降低。Abstract: The high temperature proton conductor solid electrolyte Ba3Ca1+xNb2-xO9-δ exhibit good chemical stability and high conductivity, so it has a good application prospect. Ba3Ca1+xNb2-xO9-δ (x=0, 0.10, 0.18, 0.30) composite perovskite oxides were prepared by solid state synthesis. With the increase of Ca-doped content, the conductivity of Ba3Ca1+xNb2-xO9-δsample first increased and then decreased, the conductivity of x=0.18 sample was the highest. The electron hole transport number of Ba3Ca1+xNb2-xO9-δis low in the atmosphere containing hydrogen. When the temperature is lower than 750°C, the proton conduction of Ba3Ca1+xNb2-xO9-δ is dominant. When the temperature reaches 800°C, the oxygen ions in Ba3Ca1+xNb2-xO9-δ are mainly conduction carriers. The proton transport number of Ba3Ca1+xNb2-xO9-δ with Ca doping x=0.10 was the highest. With the increase of dopant amount, the oxygen ion transport number of Ba3Ca1+xNb2-xO9-δ increased gradually, while the proton transport number decreased gradually.
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Key words:
- proton conductor /
- perovskite /
- conductivity /
- carriers /
- transport number
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