| 固体电解质La2-xCaxMo1.7W0.3O9-δ(0≤x≤0.2)的合成、表征及电性能 |
| Synthesis, Characterization and Electrical Properties of Solid State Electrolyte Materials La2-xCaxMo1.7W0.3O9-δ(0≤x≤0.2) |
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| 摘要: 在氧离子导体La2Mo1.7W0.3O9的基础上，采用固相法合成了La位掺杂的Ca系列新型氧化物La2-xCaxMo1.7W0.3O9-δ(0≤x≤0.2)。通过XRD、Raman和XPS等手段对化合物结构进行表征，交流阻抗谱测试其电性能。结果表明：掺杂离子Ca2+的半径小于基质离子La3+的半径导致晶格收缩；Ca的掺杂在La2Mo1.7W0.3O9自身内置氧空位的基础上增加了额外的氧空位，提高了氧离子导体的电导率，550 ℃电导率由0.79 × 10-4 S·cm-1 (x=0.0)增加到1.5 × 10-4 S·cm-1 (x=0.16，0.2)，电导率增加89.9%。 |
| 关键词: 氧离子导体 固体电解质 电导率 La2Mo2O9 |
| 基金项目: |
| Abstract: The new compounds La2-xCaxMo1.7W0.3O9-δ(0≤x≤0.2) in which La3+ substituted with Ca2+ were synthesized by dry-chemistry techniques based on the oxygen ionic conductor La2Mo1.7W0.3O9. The new series were characterized by X-ray Diffraction (XRD), Raman and X-ray Photoelectron Spectroscopy (XPS) and the electrical conductivity of samples were investigated by AC impedance spectroscopy. The lattice parameters were reduced due to the smaller atomic radius of the Ca2+ compared with that of the La3+. Furthermore, Additional oxygen vacancies were introduced into La2Mo1.7W0.3O9 lattice by substitution, and then the oxygen ionic conductivity was increased. At 550 ℃, the conductivity increased 89.9%, that is, from 0.79 × 10-4 S·cm-1 (x=0) to 1.5 × 10-4 S·cm-1 (x=0.16, 0.2). |
| Keywords: oxygen ion conductor solid electrolyte conductivity La2Mo2O9 |
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| 周德凤,葛志敏,郭微,孟键.固体电解质La2-xCaxMo1.7W0.3O9-δ(0≤x≤0.2)的合成、表征及电性能[J].无机化学学报,2007,23(1):81-85. |
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