应用化学 ›› 1992, Vol. 0 ›› Issue (1): 103-105.

• 研究简报 • 上一篇    下一篇

LaF3掺杂PbF2电导和氧敏性质

吴明娒, 任玉芳   

  1. 中国科学院长春应用化学研究所, 长春 130022
  • 收稿日期:1991-01-09 修回日期:1991-04-17 出版日期:1992-02-10 发布日期:1992-02-10

IONIC CONDUCTIVITY AND OXYGEN SENSING PROPERTIES OF LaF3 DOPED WITH PbF2

Wu Mingmei, Ren Yufang   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022
  • Received:1991-01-09 Revised:1991-04-17 Published:1992-02-10 Online:1992-02-10

摘要: 氟离子半径小,仅带一个负电荷;LaF3中弱的共价键结合以及晶格中空位缺陷,使其表现出高的离子导电性能。有关LaF3气敏元件的氧敏性质已有不少报道。属六方氟铈镧矿型结构的三氟化物掺杂适量的碱土金属或碱金属氟化物可提高其离子导电率。任玉芳等人研究了数种稀土复合氟化物元件的氧敏性质。掺杂PbF2的复合稀土复化物的电性和气敏性质,尚未见报道。本文合成了La1-xPbxF3-x(x= 0∼0.15)系列复合氟化物,对其电导和氧敏性质进行了研究。

关键词: 三氟化镧, 固体电解质, 氧敏元件, 电导率

Abstract: LaF3 and La1-xPbxF3-x (x=0.05~0.15) solid solution materials were prepared and their AC conductivities were measured at frequency of 10kHz Presence of an appropriate amount of PbF2 made the conductivity increase, and the conductivity of La0.95 Pb0.05 F2.95 was about one order of magnitude higher than that of pure LaF3. Four solid galvanic cells made of La0.95 Pb0.05 F2.95 as electrolyte were investigated as potentiometric oxygen sensor. The sensor cell of BiF3(Bi)/La0.95 Pb0.05 F2.95/Pt showed shorter response than the others. The 90% response of the cell took as short as 80s, while oxygen partial pressure changed from 0.21×105Pa to 1.0×105Pa at 150℃.The electrochemical reaction on the sensing electrode was referred to as "two electron reaction".

Key words: lanthanum trifluoride, solid state electrolyte, oxygen sensor, conductivity