{"id":51,"date":"2011-12-27T11:33:47","date_gmt":"2011-12-27T10:33:47","guid":{"rendered":"http:\/\/www.icmm.csic.es\/matfuelcells\/?page_id=51"},"modified":"2011-12-27T11:33:47","modified_gmt":"2011-12-27T10:33:47","slug":"double-perovskites","status":"publish","type":"page","link":"https:\/\/wp.icmm.csic.es\/matfuelcells\/research-lines\/metastable-oxides\/double-perovskites\/","title":{"rendered":"Double perovskites"},"content":{"rendered":"

An active field of research of our group is that related to the double perovskites of general formula A2<\/sub>(BB\u2019)O6<\/sub>, where A stands for an alkali-earth metal and B, B\u2019 are transition metals of the first and second (or third) rows. The most representative example is Sr2<\/sub>FeMoO6<\/sub>, ferrimagnetic and half-metallic, which is considered, at present, among the most promising MR materials, given their high TC<\/sub> and MR at low field.<\/p>\n

Recently, we demonstrated that high pressure is a powerful tool<\/strong> to minimize the <\/strong>unwanted antisite Fe\/Mo disordering: degrees of ordering close to 100% can be obtained by pressure treatments starting from partially disordered perovskites (70% order). Additionally, we have prepared, also under pressure, the perovskite Sr2<\/sub>FeReO6<\/sub> and, adequately tuning the oxidizing\/reducing conditions, a large number of novel oxides like Sr2<\/sub>BUO6<\/sub> (B= Mn, Fe, Ni, Zn), A2<\/sub>CrSbO6<\/sub> (A= Ca, Sr), Ba2<\/sub>BSbO6<\/sub> (B= Fe, Co), Sr2<\/sub>MReO6<\/sub> (M= Ni, Co, Zn), etc…<\/p>\n

\"\"<\/a>
Magnetization curve of Sr2FeMoO6, obtained by a sol-gel method with a high degree of Fe\/Mo ordering, this optimizing TC and MR<\/figcaption><\/figure>\n

Besides the currently exploited ideas to improve the properties of interest, based upon cationic substitutions<\/strong>, we aim to develop more original ideas based upon changing the anionic sublattice, enhancing the covalence of the chemical bonds<\/strong>, through nitridation or flourination of the previously formed oxide, thus favouring the first-neighbour magnetic interactions and enhancing ferromagnetism.<\/p>\n

Recent Publications<\/strong><\/p>\n

High-pressure synthesis of the double perovskite Sr2<\/sub>FeMoO6<\/sub>: increment of the cationic ordering and enhanced magnetic properties . Retuerto, M.; Martinez-Lope, M. J.; Garcia-Hernandez, M.; Alonso, J. A. JOURNAL OF PHYSICS-CONDENSED MATTER 21, 186003\u00a0 (2009)<\/p>\n

A Structural and Magnetic Study of the Series of Double Perovskites Ca2<\/sub>Fe1+x<\/sub>W1-x<\/sub>O6<\/sub>, Retuerto, M, Alonso, JA, Martinez-Lope, MJ, Garcia-Hernandez, M, Lopez, CA, Viola, MD, Pedregosa, JC, Fernandez-Diaz, MT, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 25,\u00a0 3750- 3757 (2009)<\/p>\n

Study of the valence state and electronic structure in Sr2<\/sub>FeMO6<\/sub> (M = W,\u00a0 Mo, Re and Sb) double perovskites, Retuerto, M,\u00a0 Jimenez-Villacorta, F, Martinez-Lope, MJ, Huttel, Y, Roman, E, Fernandez-Diaz, MT, Alonso, JA, PHYSICAL CHEMISTRY CHEMICAL PHYSICS 12,\u00a0 13616-13625 (2010).<\/p>\n

Raman and infrared spectroscopy of Sr2<\/sub>B\u2019UO6 <\/sub>(B \u2018 = Ni; Co) double perovskites, Moreira, A. F. L.; Garcia-Flores, A. F.; Granado, E.; Massa, N. E.; Pinacca, R. M.; Pedregosa, J. C.; Carbonio, R. E.; Munoz, A.; Martinez-Lope, M. J.; Alonso, J. A.; del Campo, L.; Meneses, D. De Sousa; Echegut, P.,VIBRATIONAL SPECTROSCOPY 54,\u00a0 142-147 (2010)<\/p>\n

Enhancing Magnetic and Magnetotransport Properties by Topotactic\u00a0\u00a0 Reduction of the Sr2Fe1.33Mo0.66O6 Double Perovskite, Lopez, CA, Viola, MD, Pedregosa, JC, Alonso, JA,\u00a0\u00a0 Fernandez-Diaz, MT, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY\u00a0 26, 4110- 4120 (2010)<\/p>\n

Crystallo-chemical evolution of the La2<\/sub>ZnTiO6<\/sub> double perovskite upon reduction: A structural study, Aguadero, A.; Alonso, J. A.; Martinez-Lope, M. J.; Fernandez-Diaz, M. T., SOLID STATE SCIENCES 13,\u00a0 13-18 (2011)<\/p>\n","protected":false},"excerpt":{"rendered":"

An active field of research of our group is that related to the double perovskites of general formula A2(BB\u2019)O6, where A stands for an alkali-earth metal and B, B\u2019 are transition metals of the first and second (or third) rows. The most representative example is Sr2FeMoO6, ferrimagnetic and half-metallic, which is considered, at present, among…<\/p>\n","protected":false},"author":66,"featured_media":0,"parent":44,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-51","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/pages\/51","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/users\/66"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/comments?post=51"}],"version-history":[{"count":0,"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/pages\/51\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/pages\/44"}],"wp:attachment":[{"href":"https:\/\/wp.icmm.csic.es\/matfuelcells\/wp-json\/wp\/v2\/media?parent=51"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}