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Ceramics of Ta-doping stabilized orthorhombic ZrO2 densified by spark plasma sintering and the effect of post-annealing in air

AuthorsSponchia, Gabriele; Moshtaghioun, Bibi Malmal; Benedetti, Alvise; Riello, Prieto; Gómez-García, D. ; Domínguez-Rodríguez, Arturo; Ortiz, Angel L.
KeywordsOrthorhombic polymorph
Spark-plasma sintering
Post-sintering annealing
Ta doping
ZrO2 ceramics
Issue Date15-Mar-2017
CitationScripta Materialia 130: 128-132 (2017)
Abstract16 mol% Ta-doped ZrO powders were synthesized and densified by spark-plasma sintering (SPS) in vacuum, followed by post-SPS annealing in air, thus obtaining two ultrafine-grained ceramics consisting of Ta-doping stabilized orthorhombic ZrO. The as-SPSed ceramic is black because it is actually a suboxide essentially with reduced cations and abundant oxygen vacancies, whereas the post-annealed ceramic is white because it is an oxide without vacancies and with only partially reduced cations. Both ceramics are relatively hard and brittle, but the as-SPSed ceramic was slightly more so, attributable to crystallographic and microstructural differences. Implications of interest for the ceramics community are discussed.
Publisher version (URL)https://doi.org/10.1016/j.scriptamat.2016.11.021
Appears in Collections:(ICMS) Artículos
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