Influence of additives on phase stabilization of scandia-doped zirconia

Autor(es)

Eliana Navarro dos Santos Muccillo ^[1] ; Robson Lopes Grosso ^[2] ; Shirley Leite dos Reis ^[3] ; Reginaldo Muccillo ^[4]

Afiliação do(s) autor(es)

^[1] Energy and Nuclear Research Institute - Brasil

^[2] Energy and Nuclear Research Institute - Brasil

^[3] Energy and Nuclear Research Institute - Brasil

^[4] Energy and Nuclear Research Institute - Brasil

• Tipo de documento: Artigo Científico
• Fonte: MATERIA-RIO DE JANEIRO; v. 22, n. 2 2017-06-01.

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. (AU)

• Processo FAPESP: 12/03319-5 - Preparação e caracterização da zircônia-escândia contendo aditivos
• Beneficiário: Robson Lopes Grosso
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs