Influence of additives on phase stabilization of scandia-doped zirconia

Author(s)

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

• Document type: Journal article
• Source: MATERIA-RIO DE JANEIRO; v. 22, n. 2 2017.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 12/03319-5 - Preparation and characterization of scandia-stabilized zirconia containing additives
• Grantee: Robson Lopes Grosso
• Support type: Scholarships in Brazil - Doctorate