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

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS-SWITZERLAND; v. 1, n. 2, p. 10-pg., 2018-12-01.

Resumo

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)

• 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