Articles
  • Sintering and electric conductivity of (Fe,Mn,Sm) codoped CeO2-δ

  • Ting-Yi Yang, Chieh Chiu and Wen-Cheng J. Wei*

  • Department of Materials Science and Engineering, National Taiwan University, Taipei, 10617, Taiwan, R.O.C

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Two ceria-based samples, Sm0.1Ce0.9O2 (ST00) and Fe0.005Mn0.005Sm0.09Ce0.9O2 (S9HH) were synthesized by EDTA-citrate method to achieve molecular-scale homogeneity. The solubility limits of the (Fe, Mn) dopants were determined by quantitative X-ray diffraction (QXRD). The microstructure of samples after sintering were analyzed by SEM and TEM. The conductivity was measured by 2-probe DC and AC impedance methods. The results showed no solubility limit of Mn and Fe with 5-9 mol% Sm in CeO2. Two ceria-based samples, ST00 and S9HH could be densified at 1,500 oC and 1,250 oC respectively in 1 h to full density. The electrical conductivity results showed that densified 9HH performed higher electrical conductivity at 800 oC, i.e. 7.15 x 10-2 S·cm-1 with an ionic transference ratio (ti) 0.76 at 600 oC. Sm-segregation near grain boundary was found in SDC, but amorphous submicron-domains in (Fe, Mn, Sm) co-doped grains were responsible for the ease of the sintering at 1,250 oC


Keywords: ceria, sintering, Sm, Fe, Mn

This Article

  • 2021; 22(5): 490-498

    Published on Oct 31, 2021

  • 10.36410/jcpr.2021.22.5.490
  • Received on Aug 8, 2020
  • Revised on Jun 9, 2021
  • Accepted on Jul 17, 2021

Correspondence to

  • Wen-Cheng J. Wei

  • Department of Materials Science and Engineering, National Taiwan University, Taipei, 10617, Taiwan, R.O.C
    Tel : +886-2 33661317 Fax: +886-2 23634562

  • E-mail: wjwei@ntu.edu.tw