Influence of impurities on the conductivity of composites in the system (3YSZ)1-x-(MgO)x

Yusuke Shiratori, F. Tietz, H. J. Penkalla, J. Q. He, Y. Shiratori, D. Stöver

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

(3YSZ)1-x-(MgO)x form composites above x = 0.15, which consist of stabilized-zirconia and magnesia. Electrical conductivities of the two-phase composites were measured by the four-probe DC technique. Negative influences of impurities such as SiO2 on the conductivity are discussed with the aid of microstructural investigations using SEM and TEM. In the investigated composites, the impurities do not directly affect the electrical conduction as current blockers at grain boundaries as usually observed in pure YSZ electrolytes. Microstructural investigation using HRTEM revealed that grain boundaries of the stabilized zirconia are very clean because the silicon and aluminum oxide impurities react with MgO to form discrete Mg2SiO4 and MgAl2O4 grains in the electrolytes, respectively. A theoretical approach taking into consideration continuous volumes of existing phases reveals that the conductivity of the two-phase composites depends on the phase continuity. The reduction of the continuity of the zirconia phase is the main reason for the decrease of conductivity in the present system.

Original languageEnglish
Pages (from-to)32-42
Number of pages11
JournalJournal of Power Sources
Volume148
Issue number1-2
DOIs
Publication statusPublished - Sep 15 2005

Fingerprint

zirconium oxides
Zirconia
Impurities
impurities
conductivity
composite materials
Composite materials
continuity
Electrolytes
Grain boundaries
grain boundaries
Magnesium Oxide
electrolytes
Aluminum Oxide
Magnesia
Silicon
yttria-stabilized zirconia
silicon oxides
aluminum oxides
direct current

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Influence of impurities on the conductivity of composites in the system (3YSZ)1-x-(MgO)x. / Shiratori, Yusuke; Tietz, F.; Penkalla, H. J.; He, J. Q.; Shiratori, Y.; Stöver, D.

In: Journal of Power Sources, Vol. 148, No. 1-2, 15.09.2005, p. 32-42.

Research output: Contribution to journalArticle

Shiratori, Yusuke ; Tietz, F. ; Penkalla, H. J. ; He, J. Q. ; Shiratori, Y. ; Stöver, D. / Influence of impurities on the conductivity of composites in the system (3YSZ)1-x-(MgO)x. In: Journal of Power Sources. 2005 ; Vol. 148, No. 1-2. pp. 32-42.
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AU - Shiratori, Y.

AU - Stöver, D.

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