{"id":7292,"date":"2025-01-12T02:48:17","date_gmt":"2025-01-12T02:48:17","guid":{"rendered":"https:\/\/jinsuncarbon.com\/?p=7292"},"modified":"2025-01-12T02:48:17","modified_gmt":"2025-01-12T02:48:17","slug":"le-graphite-est-il-magnetique","status":"publish","type":"post","link":"https:\/\/jinsuncarbon.com\/fr\/le-graphite-est-il-magnetique\/","title":{"rendered":"Le graphite est-il magn\u00e9tique ?"},"content":{"rendered":"<p class=\"ql-align-justify\">Dans la science des mat\u00e9riaux, le graphite est un <a href=\"https:\/\/jinsuncarbon.com\/fr\/materiaux-en-carbone\/\">mat\u00e9riau en carbone<\/a>Il s'agit d'un \u00e9l\u00e9ment essentiel de la structure et des propri\u00e9t\u00e9s d'un produit. Il joue un r\u00f4le cl\u00e9 dans de nombreux domaines tels que l'\u00e9criture et l'industrie. Cependant, son magn\u00e9tisme est souvent ignor\u00e9 et la connaissance qu'en a le public est vague. La recherche sur le magn\u00e9tisme et la nature du graphite n'est pas seulement li\u00e9e \u00e0 l'am\u00e9lioration de la th\u00e9orie de base. Elle pr\u00e9sente \u00e9galement un grand potentiel dans des domaines \u00e9mergents tels que l'informatique quantique.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table des mati\u00e8res<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table des mati\u00e8res\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/jinsuncarbon.com\/fr\/le-graphite-est-il-magnetique\/#Is_graphite_magnetic\" >Le graphite est-il magn\u00e9tique ?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/jinsuncarbon.com\/fr\/le-graphite-est-il-magnetique\/#Basic_properties_of_graphite\" >Propri\u00e9t\u00e9s fondamentales du graphite<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/jinsuncarbon.com\/fr\/le-graphite-est-il-magnetique\/#The_nature_of_magnetism\" >La nature du magn\u00e9tisme<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/jinsuncarbon.com\/fr\/le-graphite-est-il-magnetique\/#The_diamagnetic_properties_of_graphite\" >Propri\u00e9t\u00e9s diamagn\u00e9tiques du graphite<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/jinsuncarbon.com\/fr\/le-graphite-est-il-magnetique\/#External_factors_affecting_the_graphite_magnetic_properties\" >Facteurs externes affectant les propri\u00e9t\u00e9s magn\u00e9tiques du graphite<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/jinsuncarbon.com\/fr\/le-graphite-est-il-magnetique\/#Is_graphite_oxide_magnetic\" >L'oxyde de graphite est-il magn\u00e9tique ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/jinsuncarbon.com\/fr\/le-graphite-est-il-magnetique\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>&nbsp;<\/p>\n<h2 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"Is_graphite_magnetic\"><\/span>Le graphite est-il magn\u00e9tique ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"Basic_properties_of_graphite\"><\/span>Propri\u00e9t\u00e9s fondamentales du graphite<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ql-align-justify\">Le cristal de graphite pr\u00e9sente une structure en couches typique. Les atomes de carbone de chaque couche sont reli\u00e9s entre eux par des liaisons covalentes, formant une grille hexagonale en nid d'abeille. Les \u00e9lectrons peuvent se d\u00e9placer librement dans la couche, ce qui conf\u00e8re au graphite une bonne conductivit\u00e9 \u00e9lectrique, similaire aux caract\u00e9ristiques des liaisons m\u00e9talliques. La couche et la couche sont maintenues par une faible force de van der Waals, et la distance est grande. Macroscopiquement, le graphite a une texture douce, un \u00e9clat m\u00e9tallique, des propri\u00e9t\u00e9s chimiques relativement stables, une r\u00e9sistance aux temp\u00e9ratures \u00e9lev\u00e9es. La r\u00e9sistance \u00e0 une vari\u00e9t\u00e9 d'\u00e9rosion acide et alcaline, la structure et les propri\u00e9t\u00e9s uniques sont la base de l'exploration de son magn\u00e9tisme.<\/p>\n<h3 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"The_nature_of_magnetism\"><\/span>La nature du magn\u00e9tisme<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ql-align-justify\">Le magn\u00e9tisme provient du mouvement et de la rotation des \u00e9lectrons \u00e0 l'int\u00e9rieur des atomes. Le moment magn\u00e9tique orbital des \u00e9lectrons en orbite autour du noyau est comme un courant circulaire miniature. L'\u00e9lectron lui-m\u00eame poss\u00e8de \u00e9galement un moment magn\u00e9tique de spin, semblable au spin d'une petite toupie. Dans la plupart des mat\u00e9riaux, l'interaction des moments magn\u00e9tiques atomiques est complexe. Si les moments magn\u00e9tiques atomiques s'alignent spontan\u00e9ment dans la m\u00eame direction dans une certaine plage, le mat\u00e9riau pr\u00e9sente un ferromagn\u00e9tisme, comme le fer, le cobalt et le nickel. Les moments magn\u00e9tiques de certains mat\u00e9riaux sont oppos\u00e9s et parall\u00e8les les uns aux autres, mais leur taille est diff\u00e9rente. Il y a des moments magn\u00e9tiques nets, ce qui montre le ferromagn\u00e9tisme. Il existe \u00e9galement des mat\u00e9riaux dont les moments magn\u00e9tiques atomiques sont invers\u00e9s et parall\u00e8les et compl\u00e8tement d\u00e9cal\u00e9s, macro non magn\u00e9tiques, on parle alors de diamagn\u00e9tisme. Lorsque le champ magn\u00e9tique externe est pr\u00e9sent, l'orbite des \u00e9lectrons produit un faible moment magn\u00e9tique suppl\u00e9mentaire contre le champ externe. Il s'agit de la source diamagn\u00e9tique.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-7297\" src=\"https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic.jpg\" alt=\"Le graphite est-il magn\u00e9tique ?\" width=\"676\" height=\"449\" srcset=\"https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic.jpg 1024w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic-300x199.jpg 300w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic-768x510.jpg 768w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic-18x12.jpg 18w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic-600x398.jpg 600w\" sizes=\"(max-width: 676px) 100vw, 676px\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"The_diamagnetic_properties_of_graphite\"><\/span>Propri\u00e9t\u00e9s diamagn\u00e9tiques du graphite<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ql-align-justify\"><a href=\"https:\/\/jinsuncarbon.com\/fr\/les-utilisations-du-graphite\/\">Graphite<\/a> sont essentiellement des substances diamagn\u00e9tiques. En l'absence de champ magn\u00e9tique externe, la somme des moments magn\u00e9tiques de chaque atome \u00e0 l'int\u00e9rieur du graphite est presque nulle. Le graphite ne pr\u00e9sente donc pas de magn\u00e9tisme au sens large. Mais lorsqu'un champ magn\u00e9tique est appliqu\u00e9 au monde ext\u00e9rieur, selon le principe de l'induction \u00e9lectromagn\u00e9tique, l'\u00e9tat de mouvement des \u00e9lectrons \u00e0 l'int\u00e9rieur du graphite change. Afin d'emp\u00eacher la modification du flux magn\u00e9tique du champ magn\u00e9tique externe, les \u00e9lectrons g\u00e9n\u00e8rent un mouvement suppl\u00e9mentaire. Celui-ci forme \u00e0 son tour un moment magn\u00e9tique d'induction oppos\u00e9 \u00e0 la direction du champ magn\u00e9tique externe. Ce moment magn\u00e9tique d'induction est tr\u00e8s faible, de sorte que la performance antimagn\u00e9tique du graphite n'est pas \u00e9vidente. Sa susceptibilit\u00e9 magn\u00e9tique est g\u00e9n\u00e9ralement n\u00e9gative et sa valeur est tr\u00e8s faible, de l'ordre de -10<sup>-5<\/sup>.<\/p>\n<h2 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"External_factors_affecting_the_graphite_magnetic_properties\"><\/span>Facteurs externes affectant les propri\u00e9t\u00e9s magn\u00e9tiques du graphite<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ql-align-justify\">La temp\u00e9rature a un effet significatif sur les propri\u00e9t\u00e9s magn\u00e9tiques du graphite. Lorsque la temp\u00e9rature augmente, le mouvement thermique des atomes \u00e0 l'int\u00e9rieur du graphite s'intensifie. Cette augmentation du mouvement thermique interf\u00e8re avec le mouvement orbital des \u00e9lectrons. Il affecte \u00e0 son tour la r\u00e9ponse des \u00e9lectrons au champ magn\u00e9tique appliqu\u00e9. Plus pr\u00e9cis\u00e9ment, \u00e0 mesure que la temp\u00e9rature augmente, la valeur absolue de la susceptibilit\u00e9 diamagn\u00e9tique du graphite diminue l\u00e9g\u00e8rement. Mais ce changement est relativement lent. On peut donc consid\u00e9rer que le diamagn\u00e9tisme du graphite reste relativement stable dans une certaine gamme de temp\u00e9ratures.<\/p>\n<p class=\"ql-align-justify\">Outre la temp\u00e9rature, l'intensit\u00e9 et la fr\u00e9quence du champ magn\u00e9tique externe affectent \u00e9galement les propri\u00e9t\u00e9s magn\u00e9tiques du graphite. Lorsque l'intensit\u00e9 du champ magn\u00e9tique externe est faible, la r\u00e9ponse diamagn\u00e9tique du graphite est essentiellement conforme \u00e0 la loi lin\u00e9aire. En d'autres termes, l'aimantation est proportionnelle \u00e0 l'intensit\u00e9 du champ magn\u00e9tique externe. Toutefois, lorsque l'intensit\u00e9 du champ magn\u00e9tique externe augmente dans une certaine mesure, l'effet m\u00e9canique quantique commence \u00e0 appara\u00eetre. Les propri\u00e9t\u00e9s diamagn\u00e9tiques du graphite s'\u00e9cartent progressivement de la relation lin\u00e9aire et pr\u00e9sentent un comportement magn\u00e9tique plus complexe. En outre, pour les champs magn\u00e9tiques alternatifs, si la fr\u00e9quence est \u00e9lev\u00e9e, la vitesse de r\u00e9ponse de l'\u00e9chantillon de graphite est r\u00e9duite. <a href=\"https:\/\/en.wikipedia.org\/wiki\/Electron\" target=\"_blank\" rel=\"noopener\">\u00e9lectrons<\/a> \u00e0 l'int\u00e9rieur du graphite peut ne pas \u00eatre en mesure de suivre le changement du champ magn\u00e9tique. Il en r\u00e9sulte une modification de son diamagn\u00e9tisme.<\/p>\n<h2 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"Is_graphite_oxide_magnetic\"><\/span>L'oxyde de graphite est-il magn\u00e9tique ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ql-align-justify\"><span class=\"\" data-type=\"2\" data-index=\"1\" data-gid=\"0\"><a href=\"https:\/\/jinsuncarbon.com\/fr\/quest-ce-que-loxyde-de-graphite\/\">Oxyde de graphite<\/a> est un d\u00e9riv\u00e9 du graphite obtenu par oxydation du graphite.<\/span>\u00a0Au cours du processus d'oxydation, un grand nombre de groupes fonctionnels contenant de l'oxyg\u00e8ne, tels que les <a href=\"https:\/\/en.wikipedia.org\/wiki\/Hydroxy_group\" target=\"_blank\" rel=\"noopener\">hydroxyle<\/a>Les groupements carboxyle et \u00e9poxy sont introduits dans la structure du graphite.\u00a0<span class=\"\" data-type=\"2\" data-index=\"3\" data-gid=\"1\">L'existence de ces groupes fonctionnels contenant de l'oxyg\u00e8ne modifie consid\u00e9rablement la structure originale des couches de graphite.<\/span>\u00a0Cela augmente l'espacement des couches et d\u00e9truit le syst\u00e8me original de conjugaison des \u00e9lectrons du graphite. Il en r\u00e9sulte une diminution significative de sa conductivit\u00e9 \u00e9lectrique.<\/p>\n<p class=\"ql-align-justify\">En ce qui concerne le magn\u00e9tisme, il est d\u00fb \u00e0 l'existence d'\u00e9lectrons non appari\u00e9s dans les groupes fonctionnels contenant de l'oxyg\u00e8ne introduits dans le processus d'oxydation. Ces \u00e9lectrons non appari\u00e9s ont un moment magn\u00e9tique de spin, ce qui conf\u00e8re \u00e0 l'oxyde de graphite un certain paramagn\u00e9tisme.\u00a0<span data-type=\"2\" data-index=\"5\" data-gid=\"2\">Lorsque le degr\u00e9 d'oxydation est faible, l'oxyde de graphite conserve certaines des propri\u00e9t\u00e9s diamagn\u00e9tiques d'origine du graphite.<\/span>\u00a0\u00c0 cette \u00e9poque, le paramagn\u00e9tisme et le diamagn\u00e9tisme sont en concurrence, et la performance magn\u00e9tique macroscopique n'est pas \u00e9vidente. Cependant, avec l'augmentation du degr\u00e9 d'oxydation, le signal paramagn\u00e9tique est progressivement renforc\u00e9. Lorsqu'il d\u00e9passe un certain seuil, le paramagn\u00e9tisme domine, ce qui fait que l'oxyde de graphite dans son ensemble pr\u00e9sente un paramagn\u00e9tisme. Et sa susceptibilit\u00e9 magn\u00e9tique devient positive.<\/p>\n<h2 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ql-align-justify\">Le graphite est une substance diamagn\u00e9tique, et son diamagn\u00e9tisme est g\u00e9n\u00e9r\u00e9 par le moment magn\u00e9tique induit par les \u00e9lectrons sous le champ magn\u00e9tique externe. Il est d'une grande importance dans une sc\u00e8ne sp\u00e9cifique. L'oxyde de graphite est paramagn\u00e9tique car il contient des \u00e9lectrons non appari\u00e9s, et son magn\u00e9tisme varie en fonction du degr\u00e9 d'oxydation. Des recherches approfondies sur le magn\u00e9tisme de ces deux \u00e9l\u00e9ments permettent d'am\u00e9liorer la th\u00e9orie et de promouvoir des applications innovantes. Elle contribue \u00e9galement au d\u00e9veloppement de nouveaux mat\u00e9riaux et de nouvelles technologies.<\/p>","protected":false},"excerpt":{"rendered":"<p>In materials science, graphite is a unique carbon material, because of its special structure and properties. It plays a key role in many fields such as writing and industry. However, its magnetism is often ignored and the public&#8217;s cognition is vague. The research on the magnetism and nature of graphite is not only related to [&hellip;]<\/p>","protected":false},"author":3,"featured_media":7297,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-7292","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-carbon-graphite"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v19.2.1 (Yoast SEO v25.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Is Graphite Magnetic ? | Jinsun Carbon<\/title>\n<meta name=\"description\" content=\"Is graphite magnetic? No, it isn\u2019t. The electron configuration of the carbon atoms inside it does not produce a net magnetic moment. And there are no unpaired electrons to produce magnetism. 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No, it isn\u2019t. The electron configuration of the carbon atoms inside it does not produce a net magnetic moment. And there are no unpaired electrons to produce magnetism. 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