{"id":4728,"date":"2012-08-03T11:40:28","date_gmt":"2012-08-03T14:40:28","guid":{"rendered":"https:\/\/www.cnpem.staging.wpengine.com\/?p=4728"},"modified":"2026-03-03T10:09:08","modified_gmt":"2026-03-03T13:09:08","slug":"bond-valence-under-pressure","status":"publish","type":"post","link":"https:\/\/cnpem.br\/en\/bond-valence-under-pressure\/","title":{"rendered":"Bond Valence Under Pressure"},"content":{"rendered":"<p><em>Science, Editors&#8217; Choice, em 3\/08\/2012 Volume 337<\/em><\/p>\n<p>Physics<\/p>\n<p style=\"text-align: justify;\">Many chemical elements display different valence states in the different compounds that they form. Some, like rare earths and actinides, can also have a mixed valence state within a single compound if the difference in energies between the competing states is small. Often, the valence state is deduced from structural data by assuming a simple dependence on the bond lengths. Souza-Neto et al. demonstrate that there is a big discrepancy between the results obtained from this bond-valence model and the direct measurements of the valence state of Eu in the compound EuO under pressure. At about 44 GPa, this oxide undergoes a transition from an NaCl-like to a CsCl-like structure, wherein the two phases coexist; above 59 GPa, only the CsCl phase remains. The authors found a mixture of Eu2+and Eu3+ in the intermediate-pressure regime, and a near recovery of a homogeneous Eu2+ valence state above 59 GPa, despite a 7% volume collapse associated with the structural transition; the bond-valence model based on structural data predicts a much higher valence. The results support probing of both structure and electronic states in mixed-valence systems. \u2014 JS Phys. Rev. Lett. 109, 026403 (2012).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Science, Editors&#8217; Choice, em 3\/08\/2012 Volume 337 Physics Many chemical elements display different valence states in the different compounds that they form. Some, like rare earths and actinides, can also&hellip;<\/p>\n","protected":false},"author":17,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[1163,12],"tags":[],"class_list":["post-4728","post","type-post","status-publish","format-standard","hentry","category-clipping-cnpem","category-clipping-lnls","category-1163","category-12","description-off"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bond Valence Under Pressure - CNPEM<\/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:\/\/cnpem.br\/bond-valence-under-pressure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bond Valence Under Pressure - CNPEM\" \/>\n<meta property=\"og:description\" content=\"Science, Editors&#8217; Choice, em 3\/08\/2012 Volume 337 Physics Many chemical elements display different valence states in the different compounds that they form. 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