Effect of ferric oxide on the structure of solid solutions in the ZrO{sub 2}-Y{sub 2}O{sub 2}-Fe{sub 2}O{sub 3} system

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Inorganic Materials

OSTI ID:161912

Karavaez, Y N; Martem`yanova, Z S; Zyryanov, V G ^[1]

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1. Russian Academy of Sciences, Moscow (Russian Federation)

This study was undertaken to gain greater insight into the effect of ferric oxide, which is known to enhance the sinterability of zirconia-based ceramics and, in some cases, to reduce the temperature of stabilizing annealing. The interaction of ferric oxide with cubic fluorite-like zirconia-based solid solutions was studied in most detail. It was found that ferric oxide can be incorporated into the structure of these solid solutions in amounts that depend on the content of stabilizing oxide. When the content of Fe{sub 2}O{sub 3} exceeds its solubility in the solid solution, ferric oxide is present as a separate phase, which substantially changes the electrical properties of the solid electrolyte. According to Matsui and Takigawa, the solubility of Fe{sub 2}O{sub 3} in a cubic solid solution of composition 0.91ZrO{sub 2}+0.09Y{sub 2}O{sub 3} is about 4 mol %. It is reasonable to expect that the solubility of Fe{sub 2}O{sub 3} in tetragonal solid solutions, which contain substantially less yttria, will also be lower. In this work, the authors studied compositions in the ZrO{sub 2}-Y{sub 2}O{sub 3}-Fe{sub 2}O{sub 3} ternary system along section I, x(0.97ZrO{sub 2}+0.03Y{sub 2}O{sub 3})-yFe{sub 2}O{sub 3} (x+y=1), and section II, x(0.965ZrO{sub 2}+0.035Y{sub 2}O{sub 3})-yFe{sub 2}O{sub 3} (x+y=1), where y was varied from 0 to 0.015.

• OSTI ID: 161912
• Journal Information: Inorganic Materials, Journal Name: Inorganic Materials Journal Issue: 7 Vol. 31; ISSN 0020-1685; ISSN INOMAF
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
IRON OXIDES
SOLID SOLUTIONS
STOICHIOMETRY
TETRAGONAL LATTICES
YTTRIUM OXIDES
ZIRCONIUM OXIDES