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XRD and SEM\/EDS analysis revealed that the dissolution of praseodymium oxide in 5YSZ occurs via the formation of pyrochlore-type Pr2Zr2O7 intermediate. Increasing PrOy additions results in a larger fraction of low-conducting pyrochlore phase and larger porosity, which limit the total electrical conductivity to 2.0\u20134.6 S\/m at 900 \u00b0C and 0.28\u20130.68 S\/m at 700 \u00b0C in air. A longer time and higher temperature of firing promotes the phase and microstructural homogenization of the ceramics but with comparatively low effect on density and conductivity. High-temperature processing leads to the prevailing 3+ oxidation state of praseodymium cations in fluorite and pyrochlore structures. The fraction of Pr4+ at 600\u20131000 \u00b0C in air is \u22642% and is nearly independent of temperature. 5YSZ ceramics with praseodymia additions remain predominantly oxygen ionic conductors, with p-type electronic contribution increasing with Pr content but not exceeding 2% for x = 0.15 at 700\u2013900 \u00b0C. The average thermal expansion coefficients of prepared ceramics are in the range of 10.4\u201310.7 ppm\/K.<\/jats:p>","DOI":"10.3390\/app11135939","type":"journal-article","created":{"date-parts":[[2021,6,27]],"date-time":"2021-06-27T22:24:57Z","timestamp":1624832697000},"page":"5939","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Impact of Praseodymia Additions and Firing Conditions on Structural and Electrical Transport Properties of 5 mol.% Yttria Partially Stabilized Zirconia (5YSZ)"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5820-9865","authenticated-orcid":false,"given":"Alejandro","family":"Natoli","sequence":"first","affiliation":[{"name":"CICECO\u2014Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"given":"Jorge R.","family":"Frade","sequence":"additional","affiliation":[{"name":"CICECO\u2014Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4120-0047","authenticated-orcid":false,"given":"Aleksandr","family":"Bamburov","sequence":"additional","affiliation":[{"name":"CICECO\u2014Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"given":"Agnieszka","family":"\u017burawska","sequence":"additional","affiliation":[{"name":"Institute of Power Engineering\u2014Research Institute, Mory 8 St., 01-330 Warsaw, Poland"},{"name":"Center for Hydrogen Technologies (CTH2), Institute of Power Engineering, 36 August\u00f3wka St., 02-981 Warsaw, Poland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3837-5946","authenticated-orcid":false,"given":"Aleksey","family":"Yaremchenko","sequence":"additional","affiliation":[{"name":"CICECO\u2014Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,6,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"135","DOI":"10.1007\/s43207-020-00022-3","article-title":"Materials and nano-structural processes for use in solid oxide fuel cells: A review","volume":"57","author":"Jo","year":"2020","journal-title":"J. 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