{"id":8318,"date":"2016-11-15T15:09:45","date_gmt":"2016-11-15T15:09:45","guid":{"rendered":"http:\/\/vps468643.ovh.net\/?p=8318"},"modified":"2016-11-15T15:18:04","modified_gmt":"2016-11-15T15:18:04","slug":"directed-lifting-of-inversion-symmetry-in-ruddlesden-popper-oxide-fluorides-toward-ferroelectric-and-multiferroic-behavior-2","status":"publish","type":"post","link":"https:\/\/senngroup.com\/directed-lifting-of-inversion-symmetry-in-ruddlesden-popper-oxide-fluorides-toward-ferroelectric-and-multiferroic-behavior-2\/","title":{"rendered":"Directed Lifting of Inversion Symmetry in Ruddlesden\u2013Popper Oxide\u2013Fluorides: Toward Ferroelectric and Multiferroic Behavior"},"content":{"rendered":"<p><a href=\"http:\/\/pubs.acs.org\/doi\/abs\/10.1021\/acs.chemmater.6b03931\">Ronghuan Zhang, Mark S. Senn, and Michael A. Hayward, Chem. Mater., DOI: 10.1021\/acs.chemmater.6b03931<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>The cooperative tilting distortions of n = 2 Ruddlesden\u2013Popper oxides can be utilized to break the inversion symmetry of the host lattice and induce ferroelectric behavior. Unfortunately the desired a\u2013a\u2013c+\/a\u2013a\u2013c+ structural deformation is only stabilized in phases with extremely small structural tolerance factors, limiting the chemical scope of this symmetry breaking approach. Here we describe the influence of topochemical fluorination on the structural distortions of n = 2 Ruddlesden\u2013Popper oxides and demonstrate that the conversion of La3Ni2O7 to La3Ni2O5.5F3.5 breaks the inversion symmetry of the perovskite double layers which constitute the Ruddlesden\u2013Popper framework, by driving a change from an a\u2013a\u2013c0\/a\u2013a\u2013c0 distortion in the parent phase to an a\u2013a\u2013c+\/a\u2013a\u2013-(c+) distortion in the oxide\u2013fluoride. In this instance, the symmetry breaking distortions of adjacent acentric perovskite sheets are antialigned, and as a result the inversion symmetry of the host lattice is broken locally, but not globally, resulting in an antiferroelectric structure. The breaking of local inversion symmetry in layered perovskite phases, in the absence of second-order Jahn\u2013Teller active \u201cdistortion centers\u201d, is an important step toward the realization of ferroelectric and multiferroic behavior in phases of this structure type.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ronghuan Zhang, Mark S. Senn, and Michael A. Hayward, Chem. Mater., DOI: 10.1021\/acs.chemmater.6b03931 &nbsp; The cooperative tilting distortions of n = 2 Ruddlesden\u2013Popper oxides can be utilized to break the<br \/><a href=\"https:\/\/senngroup.com\/directed-lifting-of-inversion-symmetry-in-ruddlesden-popper-oxide-fluorides-toward-ferroelectric-and-multiferroic-behavior-2\/\" class=\"more\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":8311,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[3,64],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Directed Lifting of Inversion Symmetry in Ruddlesden\u2013Popper Oxide\u2013Fluorides: Toward Ferroelectric and Multiferroic Behavior - SENN GROUP<\/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:\/\/senngroup.com\/directed-lifting-of-inversion-symmetry-in-ruddlesden-popper-oxide-fluorides-toward-ferroelectric-and-multiferroic-behavior-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Directed Lifting of Inversion Symmetry in Ruddlesden\u2013Popper Oxide\u2013Fluorides: Toward Ferroelectric and Multiferroic Behavior - SENN GROUP\" \/>\n<meta property=\"og:description\" content=\"Ronghuan Zhang, Mark S. Senn, and Michael A. Hayward, Chem. Mater., DOI: 10.1021\/acs.chemmater.6b03931 &nbsp; The cooperative tilting distortions of n = 2 Ruddlesden\u2013Popper oxides can be utilized to break theRead more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/senngroup.com\/directed-lifting-of-inversion-symmetry-in-ruddlesden-popper-oxide-fluorides-toward-ferroelectric-and-multiferroic-behavior-2\/\" \/>\n<meta property=\"og:site_name\" content=\"SENN GROUP\" \/>\n<meta property=\"article:published_time\" content=\"2016-11-15T15:09:45+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2016-11-15T15:18:04+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/senngroup.com\/wp-content\/uploads\/2016\/11\/Chem_Mat_2016_lowres.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1250\" \/>\n\t<meta property=\"og:image:height\" content=\"596\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Mark\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mark\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/senngroup.com\/directed-lifting-of-inversion-symmetry-in-ruddlesden-popper-oxide-fluorides-toward-ferroelectric-and-multiferroic-behavior-2\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/senngroup.com\/directed-lifting-of-inversion-symmetry-in-ruddlesden-popper-oxide-fluorides-toward-ferroelectric-and-multiferroic-behavior-2\/\"},\"author\":{\"name\":\"Mark\",\"@id\":\"https:\/\/senngroup.com\/#\/schema\/person\/56efbdd98406e419d0c1fb8d15561eda\"},\"headline\":\"Directed Lifting of Inversion Symmetry in Ruddlesden\u2013Popper Oxide\u2013Fluorides: Toward Ferroelectric and Multiferroic Behavior\",\"datePublished\":\"2016-11-15T15:09:45+00:00\",\"dateModified\":\"2016-11-15T15:18:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/senngroup.com\/directed-lifting-of-inversion-symmetry-in-ruddlesden-popper-oxide-fluorides-toward-ferroelectric-and-multiferroic-behavior-2\/\"},\"wordCount\":239,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/senngroup.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/senngroup.com\/directed-lifting-of-inversion-symmetry-in-ruddlesden-popper-oxide-fluorides-toward-ferroelectric-and-multiferroic-behavior-2\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/senngroup.com\/wp-content\/uploads\/2016\/11\/Chem_Mat_2016_lowres.png\",\"articleSection\":[\"News\",\"Publications\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/senngroup.com\/directed-lifting-of-inversion-symmetry-in-ruddlesden-popper-oxide-fluorides-toward-ferroelectric-and-multiferroic-behavior-2\/\",\"url\":\"https:\/\/senngroup.com\/directed-lifting-of-inversion-symmetry-in-ruddlesden-popper-oxide-fluorides-toward-ferroelectric-and-multiferroic-behavior-2\/\",\"name\":\"Directed Lifting of Inversion Symmetry in Ruddlesden\u2013Popper Oxide\u2013Fluorides: Toward Ferroelectric and Multiferroic Behavior - 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