{"id":80822,"date":"2024-01-14T13:19:54","date_gmt":"2024-01-14T13:19:54","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/temperatura-neel\/"},"modified":"2024-01-20T10:06:51","modified_gmt":"2024-01-20T10:06:51","slug":"temperatura-neel","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/pt-br\/temperatura-neel\/","title":{"rendered":"Temperatura Neel"},"content":{"rendered":"<h2>Temperatura de N\u00e9el<\/h2>\n<p>Nomeada em homenagem ao f\u00edsico franc\u00eas Louis N\u00e9el, a temperatura de N\u00e9el \u00e9 uma caracter\u00edstica fundamental no estudo de materiais antiferromagn\u00e9ticos. Esta temperatura espec\u00edfica marca a transi\u00e7\u00e3o de fase de um estado antiferromagn\u00e9tico para um estado paramagn\u00e9tico. Compreender a temperatura de N\u00e9el \u00e9 crucial para prever o comportamento magn\u00e9tico de materiais antiferromagn\u00e9ticos e projetar dispositivos que exploram suas propriedades \u00fanicas.<\/p>\n<h2>Comportamento Abaixo e Acima da Temperatura de N\u00e9el<\/h2>\n<p>Abaixo da temperatura de N\u00e9el, um material exibe propriedades antiferromagn\u00e9ticas. Isto significa que os momentos magn\u00e9ticos de \u00e1tomos ou \u00edons adjacentes est\u00e3o alinhados em dire\u00e7\u00f5es opostas, resultando em um momento magn\u00e9tico l\u00edquido de zero. Acima da temperatura de N\u00e9el, a energia t\u00e9rmica causa o desordenamento desses momentos magn\u00e9ticos, e o material se comporta como um paramagn\u00e9tico, sem ordem magn\u00e9tica de longo alcance.<\/p>\n<h2>Exemplos de Materiais Antiferromagn\u00e9ticos<\/h2>\n<ul>\n<li><strong>\u00d3xido de Mangan\u00eas (MnO):<\/strong> MnO \u00e9 um material antiferromagn\u00e9tico com uma temperatura de N\u00e9el aproximada de 122 K (-151 \u00b0C).<\/li>\n<li><strong>\u00d3xido de N\u00edquel (NiO):<\/strong> NiO \u00e9 outro material antiferromagn\u00e9tico, com uma temperatura de N\u00e9el em torno de 523 K (250 \u00b0C).<\/li>\n<li><strong>Cromo (Cr):<\/strong> O cromo elemental \u00e9 um material antiferromagn\u00e9tico bem conhecido com uma temperatura de N\u00e9el aproximada de 311 K (38 \u00b0C).<\/li>\n<li><strong>Hematita (\u03b1-Fe<sub>2<\/sub>O<sub>3<\/sub>):<\/strong> A hematita \u00e9 um mineral de \u00f3xido de ferro e um material antiferromagn\u00e9tico com uma temperatura de N\u00e9el de cerca de 948 K (675 \u00b0C).<\/li>\n<\/ul>\n<h2>Antiferromagnetismo: Fundamentos<\/h2>\n<p>O antiferromagnetismo \u00e9 um tipo de ordem magn\u00e9tica que ocorre quando os momentos magn\u00e9ticos de \u00e1tomos ou \u00edons adjacentes se alinham em dire\u00e7\u00f5es opostas. Este comportamento \u00e9 devido \u00e0 intera\u00e7\u00e3o de troca entre \u00e1tomos ou \u00edons vizinhos, que favorece o alinhamento antiparalelo para minimizar a energia do sistema. Materiais antiferromagn\u00e9ticos tipicamente exibem ordena\u00e7\u00e3o magn\u00e9tica abaixo de uma temperatura espec\u00edfica, conhecida como temperatura de N\u00e9el. Acima desta temperatura, o material se torna paramagn\u00e9tico, perdendo suas propriedades antiferromagn\u00e9ticas.<\/p>\n<h2>Influ\u00eancias na Temperatura de N\u00e9el<\/h2>\n<p>A temperatura de N\u00e9el pode ser influenciada por fatores como composi\u00e7\u00e3o qu\u00edmica, estrutura cristalina e a presen\u00e7a de impurezas ou defeitos no material. Ajustes nessas vari\u00e1veis podem alterar significativamente o comportamento magn\u00e9tico do material, o que \u00e9 essencial para o desenvolvimento de aplica\u00e7\u00f5es tecnol\u00f3gicas baseadas em antiferromagnetismo.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.electricity-magnetism.org\/wp-content\/uploads\/2022\/01\/logo.png\" alt=\"\" \/><\/p>\n<div style=\"text-align: center; font-size: 20px;\">\n    <a href=\"https:\/\/www.electricity-magnetism.org\/neel-temperature\/\">Original Article<\/a>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A temperatura N\u00e9el, em homenagem ao f\u00edsico franc\u00eas Louis N\u00e9el, \u00e9 uma temperatura caracter\u00edstica na qual um material antiferromagn\u00e9tico sofre uma transi\u00e7\u00e3o de fase do estado antiferromagn\u00e9tico para o estado paramagn\u00e9tico.<\/p>\n","protected":false},"author":1,"featured_media":1581,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[14],"tags":[],"class_list":["post-80822","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nao-categorizado","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - 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