{"id":3308,"date":"2015-06-28T01:27:33","date_gmt":"2015-06-28T01:27:33","guid":{"rendered":"http:\/\/quiprocura.net\/w\/?post_type=portfolio&#038;p=3308"},"modified":"2015-07-01T16:41:02","modified_gmt":"2015-07-01T19:41:02","slug":"mecanismo-de-difracao","status":"publish","type":"portfolio","link":"https:\/\/quiprocura.net\/w\/portfolio-item\/mecanismo-de-difracao\/","title":{"rendered":"Mecanismo de Difra\u00e7\u00e3o"},"content":{"rendered":"\n\n<div class=\"flex_column av_two_third  flex_column_div av-zero-column-padding first  avia-builder-el-2  el_after_av_image  el_before_av_one_third  \" style='border-radius:0px; '><section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock  '   itemprop=\"text\" ><p><i><b><span style=\"font-size: small;\">Difra\u00e7\u00e3o de n\u00eautrons<\/span><\/b><\/i><\/p>\n<p><span style=\"font-size: small;\">Uma das t\u00e9cnicas mais valiosas usada na \u00e1rea de determina\u00e7\u00e3o de estrutura \u00e9 a difra\u00e7\u00e3o de n\u00eautrons. Essa t\u00e9cnica \u00e9 an\u00e1loga \u00e0 difra\u00e7\u00e3o de raio-x, mas h\u00e1 uma grande diferen\u00e7a: os raios s\u00e3o fortemente espalhados somente por altas concentra\u00e7\u00f5es de el\u00e9trons.<\/span><\/p>\n<p><span style=\"font-size: small;\">Assim, \u00e1tomos como o de hidrog\u00eanio que t\u00eam poucos el\u00e9trons s\u00e3o dif\u00edceis ou mesmo imposs\u00edveis de serem localizados no cristal pelo uso da difra\u00e7\u00e3o de raio x. por outro lado, n\u00eautrons s\u00e3o espalhados n\u00e3o pelos el\u00e9trons mas sim pelo n\u00facleo e podem ser usados para localizar a posi\u00e7\u00e3o de elementos leves, mesmo hidrog\u00eanio, em estruturas s\u00f3lidas.<\/span><\/p>\n<p><span style=\"font-size: small;\">\u00a0<\/span><strong><span style=\"font-size: small;\">Difra\u00e7\u00e3o de raio x<\/span><\/strong><\/p>\n<p><span style=\"font-size: small;\">Apesar da forma externa de um cristal fornecer indica\u00e7\u00f5es valiosas sobre a sua estrutura interna, a maioria dos conhecimentos sobre as estruturas dos materiais cristalinos prov\u00e9m de uma t\u00e9cnica com grandes recursos, <b>a difra\u00e7\u00e3o de raio x<\/b>.<\/span><\/p>\n<p><strong><span style=\"font-size: small;\">O mecanismo da difra\u00e7\u00e3o<\/span><\/strong><\/p>\n<p><span style=\"font-size: small;\">Os raios x s\u00e3o difratados por um cristal porque os el\u00e9trons dos seus \u00e1tomos absorvem a radia\u00e7\u00e3o e ent\u00e3o servem como fontes secund\u00e1rias que reemitem radia\u00e7\u00e3o em todas as dire\u00e7\u00f5es. As ondas reemitidas refor\u00e7am-se mutuamente em algumas dire\u00e7\u00f5es e se cancelam em outras.<\/span><\/p>\n<\/div><\/section><\/div>\n<div class=\"flex_column av_one_third  flex_column_div av-zero-column-padding   avia-builder-el-4  el_after_av_two_third  avia-builder-el-last  \" style='border-radius:0px; '><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"featured_media":0,"comment_status":"closed","ping_status":"open","template":"","tags":[126,65,128,54,64,127],"portfolio_entries":[48],"class_list":["post-3308","portfolio","type-portfolio","status-publish","hentry","tag-difracao-de-raio-x","tag-eletromagnetica","tag-neutrons","tag-particula","tag-radiacao","tag-radiografia","portfolio_entries-noticias"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mecanismo de Difra\u00e7\u00e3o - QuiProcura<\/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:\/\/quiprocura.net\/w\/portfolio-item\/mecanismo-de-difracao\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mecanismo de Difra\u00e7\u00e3o - QuiProcura\" \/>\n<meta property=\"og:url\" content=\"https:\/\/quiprocura.net\/w\/portfolio-item\/mecanismo-de-difracao\/\" \/>\n<meta property=\"og:site_name\" content=\"QuiProcura\" \/>\n<meta property=\"article:modified_time\" content=\"2015-07-01T19:41:02+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/quiprocura.net\/w\/portfolio-item\/mecanismo-de-difracao\/\",\"url\":\"https:\/\/quiprocura.net\/w\/portfolio-item\/mecanismo-de-difracao\/\",\"name\":\"Mecanismo de Difra\u00e7\u00e3o - QuiProcura\",\"isPartOf\":{\"@id\":\"https:\/\/quiprocura.net\/w\/#website\"},\"datePublished\":\"2015-06-28T01:27:33+00:00\",\"dateModified\":\"2015-07-01T19:41:02+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/quiprocura.net\/w\/portfolio-item\/mecanismo-de-difracao\/#breadcrumb\"},\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/quiprocura.net\/w\/portfolio-item\/mecanismo-de-difracao\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/quiprocura.net\/w\/portfolio-item\/mecanismo-de-difracao\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"In\u00edcio\",\"item\":\"https:\/\/quiprocura.net\/w\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Mecanismo de Difra\u00e7\u00e3o\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/quiprocura.net\/w\/#website\",\"url\":\"https:\/\/quiprocura.net\/w\/\",\"name\":\"QuiProcura\",\"description\":\"Conte\u00fados de qu\u00edmica, v\u00eddeos, figuras e muito mais.\",\"publisher\":{\"@id\":\"https:\/\/quiprocura.net\/w\/#\/schema\/person\/5f45798853889ca34a52bdd0208e9434\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/quiprocura.net\/w\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"pt-BR\"},{\"@type\":[\"Person\",\"Organization\"],\"@id\":\"https:\/\/quiprocura.net\/w\/#\/schema\/person\/5f45798853889ca34a52bdd0208e9434\",\"name\":\"Miguel\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-BR\",\"@id\":\"https:\/\/secure.gravatar.com\/avatar\/04972ea4984ee184e04f6f2a132a089515d0370621849c81e4b8ecad4cff8dc6?s=96&d=mm&r=g\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/04972ea4984ee184e04f6f2a132a089515d0370621849c81e4b8ecad4cff8dc6?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/04972ea4984ee184e04f6f2a132a089515d0370621849c81e4b8ecad4cff8dc6?s=96&d=mm&r=g\",\"caption\":\"Miguel\"},\"logo\":{\"@id\":\"https:\/\/secure.gravatar.com\/avatar\/04972ea4984ee184e04f6f2a132a089515d0370621849c81e4b8ecad4cff8dc6?s=96&d=mm&r=g\"},\"description\":\"Licenciado, Mestre e Doutor em Qu\u00edmica. 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