Influence of additives on phase stabilization of scandia-doped zirconia

AUTOR(ES)

Muccillo, Eliana Navarro dos Santos, Grosso, Robson Lopes, Reis, Shirley Leite dos, Muccillo, Reginaldo

FONTE

Matéria (Rio J.)

DATA DE PUBLICAÇÃO

01/06/2017

RESUMO

ABSTRACT 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.

Documentos Relacionados

• Influence of Yttria-Stabilized Zirconia on Microstructure and Electrical Properties of Doped Lanthanum Gallate
• Densificação e condutividade elétrica da Zircônia-Escândia-Céria
• Otimização de céria dopada com gadolínia e zircônia dopada com ítria
• Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn
• Influence of radiopacifier additives on calcium aluminate cement properties