Effect of Yttrium on the Crystal Structure of ZrO2
The effect of Y3+ dopant concentration in the crystal ZrO2 phase is investigated. When the Y3+ concentration is increased, the properties of the ZrO2 phase are deeply affected.
The transition temperature for the transformation from the amorphous to the tetragonal phase is substantially lowered. The resulting pure tetragonal phase remains stable at temperatures as high as 800 °C. This is probably due to Y3+ substituting for Zr4+ ions at key sites in the network of ZrO2. No presence of any contaminating monoclinic phases is detected.
The resulting systems exhibit important properties which would render them rather interesting in other fields, specifically in catalysis. Concerning the electron conducting properties, it is observed that the width of the forbidden band in these materials can be controlled by the amount of Y3+ ions added as a dopant. Considering the band gap values experimentally observed, materials with interesting electrical properties in the ionic conductivity domain can be obtained.
KeywordsZirconium Hydroxyl Catalysis Diesel Yttrium
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