Equimolar Yttria-Stabilized Zirconia and Samaria-Doped Ceria Solid Solutions

Author(s)

Muccillo, Reginaldo ; de Florio, Daniel Z. ; Muccillo, Eliana N. S.

• Document type: Journal article
• Source: CERAMICS-SWITZERLAND; v. 1, n. 2, p. 10-pg., 2018-12-01.

Abstract

Compositions of (ZrO2)0.92(Y2O3) 0.08 (zirconia: 8mol% yttria-8YSZ) and (CeO2)0.8(Sm2O3) 0.2 (ceria: 20 mol % samaria-SDC20) ceramic powders were prepared by attrition milling to form an equimolar powder mixture, followed by uniaxial and isostatic pressing. The pellets were quenched to room temperature from 1200 ffi C, 1300 ffi C, 1400 ffi C and 1500 ffiC to freeze the defects configuration attained at those temperatures. X-ray diffraction analyses, performed in all quenched pellets, show the evolution of the two (8YSZ and SDC20) cubic fluorite structural phases to a single phase at 1500 ffi C, identified by Rietveld analysis as a tetragonal phase. Impedance spectroscopy analyses were carried out in pellets either quenched or slowly cooled from 1500 ffi C. Heating the quenched pellets to 1000 ffiC decreases the electrical resistivity while it increases in the slowly cooled pellets; the decrease is ascribed to annealing of defects created by lattice micro-tensions during quenching while the increase to partial destabilization of the tetragonal phase. (AU)

• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC