Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (07): 617-623.doi: 10.3866/PKU.WHXB20020710

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AC Impedance and Gas Concentration Cell Measurements for Ba12Y4.67Ti8O35

Jing Xi-Ping;Anthony R.West   

  1. State Key Laboratory of Rate Earth Materials Chemistry and Applicalion,College of Chemistry and Molecular Engineering,Peking University, Beijing　100871;Department of Engineering Materials,University of Sheffield, Sheffield S1 3JD, UK
  • Received:2001-11-28 Revised:2002-03-08 Published:2002-07-15
  • Contact: Jing Xi-Ping E-mail:xpjing@chem.pku.edu.cn

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Abstract: A ceramic phase Ba12Y4.67Ti8O35 was prepared by solid state reactions,the electrical properties of which were characterised by means of AC impedance spectroscopy,gas concentration cell as well as thermoelectric measurements. The measurements indicate that this material is an oxide ion/hole mixed conductor. At 700 ℃,the bulk conductivity of the material is ～2×10－3Ω－1•cm－1.The impedance data measured at 700 ℃ in air,O2 and N2 atmospheres were analysed by using computer curve fitting,which explains that the ion diffusion impedance is hidden in air and O2 atmospheres because the oxide ion pathway is short circuited by electronic conduction.

Key words: AC impedance, Oxygen concentration cell, Mixed conductor, Equivalent circuit fitting, Ba12Y4.67Ti8O35