La0．9Sr0．1Ga0．8Mg0．2AlxO3-δ（x=0～0．05）电解质电导率的研究

Study on the conductivity of La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)Al_xO_(3-δ)(x=0～0.05) electrolytes

用固相合成法制备了La0．9Sr0．1Ga0．8Mg0．2AlxO3-δ（x=0～0．05）电解质。利用四电极交流阻抗法和Hebb-Wagner极化法测量了电解质的总电导率和电子电导率。结果表明：电解质的总电导率与氧分压无明显依赖关系，且随着Al2O3含量的增加而减小。在800℃下，电解质的自由电子电导率以及电子空穴电导率的氧分压级数分别为-1／4和1／4，符合Hebb-Wagner。公式。随着Al2O3含量的增加，电子空穴电导率变化不明显，自由电子电导率减小。

La0.9Sr0.1Ga0.8Mg0.2AlxO3-δ（x=0～0.05） electrolytes were prepared by the soild-state reaction method. The total conductivity and electron conductivity of the electrolytes were measured by four-dectrode, AC impedance and Hebb-Wagner polarization methods, The results showed that the total conductivity of the electrolyte had no obvious dependency on the oxygen partial pressure and decreased with the increase of the Al2O3 content. The orders of dependency of the free electron conductivity and the electron hole conductivity on the oxygen partial pressure was - 1/4 and 1/4 at 800 ℃, respectively, which agreed with the Hebb- Wagner equation. The electron hole conductivity had no change while free electron conductivity decreased with the increase of the Al2O3 content.