{"id":5956,"date":"2026-01-05T15:24:23","date_gmt":"2026-01-05T20:24:23","guid":{"rendered":"https:\/\/cqfa.quebec\/?p=5956"},"modified":"2026-01-05T15:26:45","modified_gmt":"2026-01-05T20:26:45","slug":"room-temperature-laser-crystallization-of-oxygen-vacancy-engineered-zirconia-for-additive-manufacturing","status":"publish","type":"post","link":"https:\/\/cqfa.quebec\/en\/room-temperature-laser-crystallization-of-oxygen-vacancy-engineered-zirconia-for-additive-manufacturing\/","title":{"rendered":"Room-temperature laser crystallization of oxygen vacancy-engineered zirconia for additive manufacturing"},"content":{"rendered":"<p><em>Benavides-Guerrero, J.A.; Gerlein, L.F.; Angel-Ospina, A.C.; Fourmont, P.; Bhattacharya, A.; Zirakjou, A.; Vaussenot, F.; Ross, C.A.; Cloutier, S.G. (2025). Room-temperature laser crystallization of oxygen vacancy-engineered zirconia for additive manufacturing. Additive Manufacturing, vol. 111, 2025, 104969. <\/em><\/p>\n<p>&nbsp;<\/p>\n<p>We demonstrate how strategically engineered oxygen vacancies enable room-temperature laser crystallization of zirconia (ZrO\u2082) in ambient air. Our sol-gel chelation synthesis creates amorphous ZrO\u2082 nanoparticles with a high concentration of oxygen vacancies that fundamentally alter the material&#8217;s energy landscape. These defects create sub-bandgap states that facilitate visible light absorption and dramatically reduce the energy barrier for crystallization. Under low-energy laser irradiation (405\u2013532\u202fnm), oxygen vacancies mediate a rapid phase transformation mechanism where atmospheric oxygen interacts with vacancy sites, triggering ionic rearrangement and crystallization without conventional high-temperature processing. For comparison purposes, this study also explores the thermal crystallization of black zirconia in an oxidative atmosphere, a process typically performed under vacuum or inert conditions. Through comprehensive characterization (FTIR, EPR, XPS, XRD, Raman), we establish that vacancy-mediated crystallization produces monoclinic ZrO\u2082 with preserved defect structures, yielding a distinctive black phase with 25.6\u202f% oxygen vacancy concentration, significantly higher than thermally processed counterparts (9.2\u202f%). This vacancy-enabled crystallization circumvents the need for extreme temperatures (&gt;1170\u00b0C) typically required for ZrO\u2082 processing, making it compatible with additive manufacturing. Using a modified 3D printer with a 405\u202fnm laser, we demonstrate patterned crystallization of complex architectures, opening new possibilities for fabricating advanced ZrO\u2082-based devices for photocatalysis, fuel cells, and energy applications. This work provides fundamental insights into defect-mediated phase transformations and establishes a new paradigm for room-temperature ceramic processing.<\/p>\n<p>&nbsp;<\/p>\n<p class=\"link-btn-style btn-yellow\"><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2214860425003331\" target=\"_blank\" rel=\"noopener\">Read the publication<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Benavides-Guerrero, J.A.; Gerlein, L.F.; Angel-Ospina, A.C.; Fourmont, P.; Bhattacharya, A.; Zirakjou, A.; Vaussenot, F.; Ross, C.A.; Cloutier, S.G. (2025). Room-temperature laser crystallization of oxygen vacancy-engineered zirconia for additive manufacturing. Additive [&hellip;]<\/p>\n","protected":false},"author":80,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"categories":[43],"tags":[],"class_list":["post-5956","post","type-post","status-publish","format-standard","hentry","category-publications-academiques-quebecoises"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Room-temperature laser crystallization of oxygen vacancy-engineered zirconia for additive manufacturing - CQFA - Carrefour qu\u00e9b\u00e9cois de la fabrication additive<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cqfa.quebec\/en\/room-temperature-laser-crystallization-of-oxygen-vacancy-engineered-zirconia-for-additive-manufacturing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Room-temperature laser crystallization of oxygen vacancy-engineered zirconia for additive manufacturing - CQFA - Carrefour qu\u00e9b\u00e9cois de la fabrication additive\" \/>\n<meta property=\"og:description\" content=\"Benavides-Guerrero, J.A.; Gerlein, L.F.; Angel-Ospina, A.C.; Fourmont, P.; Bhattacharya, A.; Zirakjou, A.; Vaussenot, F.; Ross, C.A.; Cloutier, S.G. 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