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http://hdl.handle.net/10773/29197
Title: | Structural Design of 5 mol.% Yttria Partially Stabilized Zirconia (5Y-PSZ) by Addition of Manganese Oxide and Direct Firing |
Author: | Natoli, Alejandro Yaremchenko, Aleksey Frade, Jorge R. |
Keywords: | Zirconia Manganese oxide Electrical conductivity Thermochemical expansion Solid electrolyte cell |
Issue Date: | 2020 |
Publisher: | MDPI |
Abstract: | In this study, 5Y-PSZ-based ceramics with 15 mol.% of manganese oxide were obtained from PSZ + MnO2 powders mixtures by pressing and direct firing. The resulting materials show a stable cubic fluorite structure with only minor traces of segregated manganese oxides and relative density from 90% to 98%. The linear thermal expansion coeffcient is in the order of 10^-5 K^-1 at 500 K and increases gradually with temperature, due to the onset of a contribution of chemical expansion, reaching about 13x10^-6 K^-1 at 1100 K. These results are suitable for prospective applicability as buffer layers to minimize degradation and delamination of electrolyte/oxygen electrode interfaces in solid electrolyte cells. The electrical conductivity remains close to 1 S/m at 973 K and close to 7 S/m at 1273 K, suggesting mixed conductivity with a prospective contribution to electrode processes occurring at electrode/electrolyte interfaces. Guidelines for further improvement were also established by a detailed analysis of the impact of heating/cooling rate, firing temperature, and time on those properties, based on Taguchi planning. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/29197 |
DOI: | 10.3390/ceramics3030031 |
ISSN: | 2571-6131 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Ceramics_3_(2020)_345.pdf | 7.19 MB | Adobe PDF | View/Open |
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