{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,24]],"date-time":"2025-11-24T07:45:11Z","timestamp":1763970311194,"version":"3.45.0"},"reference-count":0,"publisher":"The Electrochemical Society","issue":"1","license":[{"start":{"date-parts":[[2025,11,24]],"date-time":"2025-11-24T00:00:00Z","timestamp":1763942400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/iop-standard\/v1"},{"start":{"date-parts":[[2025,11,24]],"date-time":"2025-11-24T00:00:00Z","timestamp":1763942400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["Meet. Abstr."],"published-print":{"date-parts":[[2025,11,24]]},"abstract":"<jats:p>\n                    The introduction of a ceria-based diffusion barrier layer between electrolyte and Sr-containing oxygen electrode is a common approach to avoid the formation of undesirable low-conducting SrZrO\n                    <jats:sub>3<\/jats:sub>\n                    phase at the electrolyte\/electrode interface with negative effects on the performance of solid oxide cell (SOC\/SOEC). However, partial reduction of cerium cation to 3+ oxidation state under reducing conditions induces noticeable chemical expansion of doped ceria ceramics and may cause delamination of the ceria-based buffer layer applied at the fuel electrode side of solid oxide cell. The present work explores pyrochlore-type Y\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    -based titanates as alternative interlayer materials operating at the interface between the electrolyte and Sr-containing fuel electrodes.\n                  <\/jats:p>\n                  <jats:p>\n                    A- and\/or B-site Y\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    -based compositions including (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Ca\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    , (Y\n                    <jats:sub>0.85<\/jats:sub>\n                    Ca\n                    <jats:sub>0.15<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    , (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Ca\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    (Ti\n                    <jats:sub>0.6<\/jats:sub>\n                    Zr\n                    <jats:sub>0.4<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    , (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Ca\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    (Ti\n                    <jats:sub>0.9<\/jats:sub>\n                    Mn\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    , (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Mg\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    , and Y\n                    <jats:sub>2<\/jats:sub>\n                    (Ti\n                    <jats:sub>0.9<\/jats:sub>\n                    Mg\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    were selected as candidate materials. The materials were prepared by solid reaction method and sintered at 1600-1700\u00b0C in air. The characterization included structural and microstructural studies, controlled-atmosphere dilatometry, and measurements of electrical transport properties (electrical conductivity as a function of temperature and oxygen partial pressure by AC impedance spectroscopy, oxygen-ion transference numbers by modified EMF method).\n                  <\/jats:p>\n                  <jats:p>\n                    The results showed that the solubility of calcium cations in the yttrium sublattice is limited to 10 at.%. Apart from (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Ca\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    , only (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Ca\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    (Ti\n                    <jats:sub>0.6<\/jats:sub>\n                    Zr\n                    <jats:sub>0.4<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    and (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Mg\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    were phase-pure pyrochlores, while other materials contained different types of secondary phases. Total electrical conductivity of single-phase ceramics in air increased in the row (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Ca\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    (Ti\n                    <jats:sub>0.6<\/jats:sub>\n                    Zr\n                    <jats:sub>0.4<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    &lt; (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Mg\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    &lt; (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Ca\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    reaching 0.02 S\/cm at 800\u00b0C (Fig.1). The conductivity is predominantly oxygen-ionic at intermediate oxygen pressures, while minor contributions of p-type and n-type electronic transport increase under oxidizing and reducing conditions, respectively. Average oxygen-ion transference numbers under air\/(10%H\n                    <jats:sub>2<\/jats:sub>\n                    -N\n                    <jats:sub>2<\/jats:sub>\n                    ) gradient at 800\u00b0C were 0.995 for (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Ca\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    and 0.983 for (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Mg\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    . Pyrochlore-type titanate ceramics showed moderate thermal expansion coefficients, 10.2-10.4 ppm\/K, under both oxidizing and reducing conditions at 25-1100\u00b0C and negligible chemical expansion. On the contrary, gadolinia-doped ceria Ce\n                    <jats:sub>0.9<\/jats:sub>\n                    Gd\n                    <jats:sub>0.1<\/jats:sub>\n                    O\n                    <jats:sub>2-\u03b4<\/jats:sub>\n                    ceramics underwent a substantial chemical expansion and cracking on heating above 700-800\u00b0C in 10%H\n                    <jats:sub>2<\/jats:sub>\n                    -N\n                    <jats:sub>2<\/jats:sub>\n                    atmosphere.\n                  <\/jats:p>\n                  <jats:p>\n                    (Y\n                    <jats:sub>0.9<\/jats:sub>\n                    Ca\n                    <jats:sub>0.1<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Ti\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    was selected as the preferred interlayer candidate material with the highest ionic conductivity. A procedure for the fabrication of a thin interlayer in a model electrolyte-supported button cell was developed. Chemical compatibility was verified in contact with solid electrolyte, yttria-stabilized zirconia, and model fuel electrode materials, Sr\n                    <jats:sub>0.85<\/jats:sub>\n                    Pr\n                    <jats:sub>0.15<\/jats:sub>\n                    TiO\n                    <jats:sub>3-\u03b4<\/jats:sub>\n                    and SrFe\n                    <jats:sub>0.75<\/jats:sub>\n                    Mo\n                    <jats:sub>0.25<\/jats:sub>\n                    O\n                    <jats:sub>3-\u03b4<\/jats:sub>\n                    .\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:inline-formula\/>\n                  <\/jats:p>\n                  <jats:p>Figure 1<\/jats:p>\n                  <jats:p\/>","DOI":"10.1149\/ma2025-031364mtgabs","type":"journal-article","created":{"date-parts":[[2025,11,24]],"date-time":"2025-11-24T07:41:14Z","timestamp":1763970074000},"page":"364-364","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Y\n                    <sub>2<\/sub>\n                    Ti\n                    <sub>2<\/sub>\n                    O\n                    <sub>7<\/sub>\n                    -Based Pyrochlores for Diffusion Barrier Layer at the Electrolyte\/Fuel Electrode Interface in Solid Oxide Cells"],"prefix":"10.1149","volume":"MA2025-03","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3837-5946","authenticated-orcid":false,"given":"Aleksey","family":"Yaremchenko","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4120-0047","authenticated-orcid":false,"given":"Aleksandr","family":"Bamburov","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"77","container-title":["ECS Meeting Abstracts"],"original-title":[],"link":[{"URL":"https:\/\/iopscience.iop.org\/article\/10.1149\/MA2025-031364mtgabs","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/iopscience.iop.org\/article\/10.1149\/MA2025-031364mtgabs\/pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/iopscience.iop.org\/article\/10.1149\/MA2025-031364mtgabs\/pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/iopscience.iop.org\/article\/10.1149\/MA2025-031364mtgabs\/pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,11,24]],"date-time":"2025-11-24T07:41:14Z","timestamp":1763970074000},"score":1,"resource":{"primary":{"URL":"https:\/\/iopscience.iop.org\/article\/10.1149\/MA2025-031364mtgabs"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,11,24]]},"references-count":0,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2025,11,24]]}},"URL":"https:\/\/doi.org\/10.1149\/ma2025-031364mtgabs","relation":{},"ISSN":["2151-2043"],"issn-type":[{"value":"2151-2043","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,11,24]]},"assertion":[{"value":"Y\n                      2\n                      Ti\n                      2\n                      O\n                      7\n                      -Based Pyrochlores for Diffusion Barrier Layer at the Electrolyte\/Fuel Electrode Interface in Solid Oxide Cells","name":"article_title","label":"Article Title"},{"value":"ECS Meeting Abstracts","name":"journal_title","label":"Journal Title"},{"value":"paper","name":"article_type","label":"Article Type"},{"value":"\u00a9 2025 ECS - The Electrochemical Society","name":"copyright_information","label":"Copyright Information"},{"name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}