SHIRLEY LEITE DOS REIS
1 resultados
Resultados de Busca
Agora exibindo 1 - 1 de 1
Artigo IPEN-doc 23089 Influence of additives on phase stabilization of scandia-doped zirconia2017 - MUCCILLO, ELIANA N. dos S.; GROSSO, ROBSON L.; REIS, SHIRLEY L. dos; MUCCILLO, REGINALDOThe 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.