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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Inhibition of order-disorder phase transition and improvements in the BICUVOX.1 properties by using yttria-stabilized zirconia particles

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Autor(es):
Piva, R. H. [1] ; Piva, D. H. [2] ; Venturini, J. [2] ; Floriano, R. [3] ; Morelli, M. R. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Fed Sao Carlos, Lab Ceram Synth & Formulat, BR-13560 Sao Carlos, SP - Brazil
[2] Univ Fed Rio Grande do Sul, Lab Ceram Mat, BR-90046900 Porto Alegre, RS - Brazil
[3] Univ Estadual Campinas, Fac Ciencias Aplicadas, Limeira, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: CERAMICS INTERNATIONAL; v. 41, n. 1, A, p. 171-177, JAN 2015.
Citações Web of Science: 5
Resumo

Composite solid electrolytes were prepared varying the addition of yttria-stabilized zirconia (3Y-TZP) from 3 to 26 wt% using a matrix of copper-substituted bismuth vanadate (BICUVOX.1). The effects of stabilized zirconia concentration were added and their relation with the tensile strength, thermal expansion, phase transition and electrical conductivity were evaluated. When compared to pristine BICUVOX.1, the addition of 26 wt% of 3Y-TZP led to an increase of 144% in tensile strength and a reduction of the thermal expansion coefficient from 12.3 x 10(-6) degrees C-1 to 9.6 x 10(-6) degrees C-1. Such improvements stems from grain growth inhibition due to the Zener pinning effect. Impedance measurements and thermal analyses showed that the addition of high zirconia concentrations is an effective way to prevent the gamma'<->gamma phase transition in the BICUVOX.1 matrix. Nevertheless, the total electrical conductivity has been continuously reduced with a progressive increase in the amount of zirconia. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

Processo FAPESP: 13/14189-8 - Revestimentos de zircônia codopada com Nb2O5/Ta2O5 + Sc2O3 como barreira térmica para aplicação em turbinas
Beneficiário:Roger Honorato Piva
Linha de fomento: Bolsas no Brasil - Doutorado