{"id":428295,"date":"2023-07-27T16:48:40","date_gmt":"2023-07-27T14:48:40","guid":{"rendered":"https:\/\/www.eenewseurope.com\/?p=428295"},"modified":"2023-08-01T12:20:04","modified_gmt":"2023-08-01T10:20:04","slug":"la-course-au-supraconducteur-a-temperature-ambiante-est-lancee","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/la-course-au-supraconducteur-a-temperature-ambiante-est-lancee\/","title":{"rendered":"La course au supraconducteur \u00e0 temp\u00e9rature ambiante relanc\u00e9e"},"content":{"rendered":"<h4>Des chercheurs cor\u00e9ens ont publi\u00e9 un article qui, selon eux, pr\u00e9sente le premier supraconducteur fonctionnant \u00e0 temp\u00e9rature et pression ambiantes<\/h4>\n<p>L&rsquo;article sur le mat\u00e9riau supraconducteur \u00e0 temp\u00e9rature ambiante a \u00e9t\u00e9 publi\u00e9 sur le serveur de pr\u00e9-publication <a title=\"arxiv.org\" href=\"arxiv.org\" target=\"_blank\" rel=\"noopener\">arxiv.org<\/a> et doit encore faire l&rsquo;objet d&rsquo;une \u00e9valuation par les pairs, mais il gagne en popularit\u00e9 aupr\u00e8s des chercheurs. S&rsquo;il s&rsquo;av\u00e8re que ce r\u00e9sultat est reproductible, le mat\u00e9riau pourrait r\u00e9duire consid\u00e9rablement les pertes d&rsquo;\u00e9nergie.<\/p>\n<p>\u00ab\u00a0Pour la premi\u00e8re fois au monde, nous avons r\u00e9ussi \u00e0 synth\u00e9tiser un supraconducteur \u00e0 temp\u00e9rature ambiante (Tc\u2265400 K, 127\u2218C) fonctionnant \u00e0 pression ambiante avec une structure plomb-apatite modifi\u00e9e (LK-99)\u00a0\u00bb, a d\u00e9clar\u00e9 Sukbae Lee, PDG du Centre de recherche sur l&rsquo;\u00e9nergie quantique (Q-Centre) de l&rsquo;Universit\u00e9 de Cor\u00e9e, avec ses coll\u00e8gues Ji-Hoon Kim et Young-Wan Kwon.<\/p>\n<p>Des chercheurs de l&rsquo;universit\u00e9 du Nevada ont mis au point un mat\u00e9riau \u00e0 temp\u00e9rature ambiante en 2020 et ont cr\u00e9\u00e9 une entreprise appel\u00e9e Unearthly Materials pour le d\u00e9velopper. Un autre mat\u00e9riau, appel\u00e9 Reddmatter, mis au point \u00e0 l&rsquo;universit\u00e9 de Rochester, aux \u00c9tats-Unis, est \u00e9galement prometteur.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.eenewseurope.com\/en\/first-room-temperature-superconductor-demonstrated\/\">Premi\u00e8re d\u00e9monstration d&rsquo;un supraconducteur \u00e0 temp\u00e9rature ambiante<\/a><\/li>\n<li><a href=\"https:\/\/www.eenewseurope.com\/en\/reddmatter-the-future-of-superconductivity\/\">Reddmatter &#8211; L&rsquo;avenir de la supraconductivit\u00e9<\/a><\/li>\n<li><a href=\"https:\/\/www.eenewseurope.com\/en\/low-cost-superconductor-boosts-power-connections\/\">Un supraconducteur \u00e0 faible co\u00fbt pour am\u00e9liorer les connexions \u00e9lectriques<\/a><\/li>\n<\/ul>\n<p>La supraconductivit\u00e9 du LK-99 est d\u00e9montr\u00e9e par la temp\u00e9rature critique (Tc), la r\u00e9sistivit\u00e9 z\u00e9ro, le courant critique (Ic), le champ magn\u00e9tique critique (Hc) et l&rsquo;effet Meissner. Elle provient d&rsquo;une infime distorsion structurelle due \u00e0 une l\u00e9g\u00e8re contraction du volume (0,48 %), et non de facteurs externes tels que la temp\u00e9rature et la pression.<\/p>\n<p>La structure unique du LK-99, qui permet de conserver une structure l\u00e9g\u00e8rement d\u00e9form\u00e9e dans les interfaces, est le facteur le plus important qui permet au LK-99 de conserver et d&rsquo;afficher une supraconductivit\u00e9 \u00e0 temp\u00e9rature et pression ambiantes.<\/p>\n<p>Le retrait est caus\u00e9 par la substitution des ions Pb2+(2) par les ions Cu2+ dans le r\u00e9seau isolant du phosphate de Pb(2) et g\u00e9n\u00e8re la contrainte. Les r\u00e9sultats de la capacit\u00e9 thermique indiquent que le nouveau mod\u00e8le permet d&rsquo;expliquer la supraconductivit\u00e9 du LK-99.<\/p>\n<p>Le mat\u00e9riau LK-99 est une structure cristalline d&rsquo;apatite au plomb modifi\u00e9e de composition Pb10-xCux(PO4)6O (0,9&lt;x&lt;1.1) et a \u00e9t\u00e9 synth\u00e9tis\u00e9 \u00e0 l&rsquo;aide d&rsquo;une m\u00e9thode \u00e0 l&rsquo;\u00e9tat solide. Il pr\u00e9sente les caract\u00e9ristiques du m\u00e9tal ohmique du Pb(6s1) au-dessus de sa temp\u00e9rature critique supraconductrice, Tc, et le ph\u00e9nom\u00e8ne de l\u00e9vitation comme l&rsquo;effet Meissner d&rsquo;un supraconducteur \u00e0 temp\u00e9rature ambiante et \u00e0 pression atmosph\u00e9rique en dessous de Tc. Un \u00e9chantillon de LK-99 pr\u00e9sente un Tc sup\u00e9rieur \u00e0 126,85\u2218C (400 K).<\/p>\n<p>\u00ab\u00a0Nous analysons que la possibilit\u00e9 de supraconductivit\u00e9 \u00e0 temp\u00e9rature ambiante dans ce mat\u00e9riau est attribu\u00e9e \u00e0 deux facteurs : le premier \u00e9tant la contraction du volume r\u00e9sultant d&rsquo;une transition isolant-m\u00e9tal r\u00e9alis\u00e9e en rempla\u00e7ant le Pb par le Cu, et le second \u00e9tant l&rsquo;interaction de Coulomb r\u00e9pulsive sur place renforc\u00e9e par la d\u00e9formation structurelle dans la cha\u00eene unidimensionnelle (D) (Pb2-O1\/2-Pb2 le long de l&rsquo;axe c) due \u00e0 la condensation supraconductrice \u00e0 Tc\u00a0\u00bb, a d\u00e9clar\u00e9 Lee dans un second article sur la structure du mat\u00e9riau.<\/p>\n<p><a href=\"https:\/\/arxiv.org\/abs\/2307.12008\">arxiv.org\/abs\/2307.12008<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Des chercheurs cor\u00e9ens ont publi\u00e9 un article qui, selon eux, pr\u00e9sente le premier supraconducteur fonctionnant \u00e0 temp\u00e9rature et pression ambiantes L&rsquo;article sur le mat\u00e9riau supraconducteur \u00e0 temp\u00e9rature ambiante a \u00e9t\u00e9 publi\u00e9 sur le serveur de pr\u00e9-publication arxiv.org et doit encore faire l&rsquo;objet d&rsquo;une \u00e9valuation par les pairs, mais il gagne en popularit\u00e9 aupr\u00e8s des chercheurs. [&hellip;]<\/p>\n","protected":false},"author":34,"featured_media":428115,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[883],"tags":[913,2377],"domains":[47],"ppma_author":[1153,3640],"class_list":["post-428295","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologies","tag-materials-processes-fr","tag-supraconducteur","domains-electronique-eci"],"acf":[],"yoast_head":"<title>La course au supraconducteur \u00e0 temp\u00e9rature ambiante relanc\u00e9e ...<\/title>\n<meta name=\"description\" content=\"Des chercheurs cor\u00e9ens ont publi\u00e9 un article qui pr\u00e9sente le premier supraconducteur fonctionnant \u00e0 temp\u00e9rature et pression ambiantes.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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