Influence of additives on phase stabilization of scandia-doped zirconia

Materia

Muccillo, Reginaldo¹  Muccillo, Eliana Navarro dos Santos¹  Grosso, Robson Lopes¹  Reis, Shirley Leite dos¹ 

[1] Energy and Nuclear Research Institute, S. Paulo, Brasil

关键词: scandia-doped zirconia;    phase stabilizer;    sintering aid;    ionic conductivity.;   

DOI  :  10.1590/s1517-707620170002.0154

学科分类：工程和技术（综合）

来源: Universidade Federal do Rio de Janeiro * Coordenacao dos Programas de Pos-Graduacao de Engenharia

【 摘 要 】

The effects of small additions of tin, zinc, calcium and boron oxides on phase composition and electrical conductivity of zirconia-10 mol% scandia were investigated. Compounds containing 1 mol% zinc, tin and calcium oxides and 1, 3 and 5 wt.% boron oxide were prepared by solid state reaction and characterized by X-ray diffraction, density measurements, scanning electron microscopy and impedance spectroscopy. Full stabilization of the cubic structure at room temperature was obtained with additions of 1 mol% calcium oxide and 2 wt.% boron oxide. Partially stabilized compounds exhibit herringbone structure, characteristic of the β-rhombohedric phase. Specimens with calcium as additive show total conductivity of 23.8 mS.cm-1 at 750ºC with activation energy of 1.13 eV. Liquid phase sintering by boron oxide addition is effective to enhance the densification of the solid electrolyte.

【 授权许可】

CC BY