{"id":28589,"date":"2011-09-30T23:46:41","date_gmt":"2011-09-30T21:46:41","guid":{"rendered":"https:\/\/icmsva.vallealto.es\/?articulos_sci=evolution-of-phases-and-al-si-distribution-during-na-4-mica-synthesis"},"modified":"2026-04-14T11:49:33","modified_gmt":"2026-04-14T09:49:33","slug":"evolution-of-phases-and-al-si-distribution-during-na-4-mica-synthesis","status":"publish","type":"articulos_sci","link":"https:\/\/icmsva.vallealto.es\/?articulos_sci=evolution-of-phases-and-al-si-distribution-during-na-4-mica-synthesis","title":{"rendered":"Evolution of Phases and Al\u2013Si Distribution during Na-4-Mica Synthesis"},"content":{"rendered":"<figure><img decoding=\"async\" src=\"https:\/\/icmsva.vallealto.es\/wp-content\/uploads\/2011\/09\/Evolution-of-Phases-and-Al\u2013Si-Distribution-during-1.gif\" alt=\"Evolution of Phases and Al\u2013Si Distribution during Na-4-Mica Synthesis\" \/><\/figure>\n<p>Na-4-mica, a highly charged fluorophlogopite, has recently attracted much attention because of its unique combination of high charge (four charges per unit cell) and its swelling and cation-exchange properties. The ability to improve the properties of this mica depends on gaining knowledge about its phase evolution during the calcination process. For the synthesis, the stoichiometric powder mixture (4SiO <sub>2<\/sub>\/2Al <sub>2<\/sub>O <sub>3<\/sub>\/6MgF <sub>2<\/sub>\/8NaCl) was heated to 900 \u00b0C for 0-600 h. The obtained solids were characterized by X-ray fluorescence (XRF); X-ray diffraction (XRD); scanning electron microscopy\/energy-dispersive X-ray (SEM\/EDX) analysis; <sup>29<\/sup>Si, <sup>27<\/sup>Al, and <sup>23<\/sup>Na magic-angle-spinning MAS NMR spectroscopy; and thermogravimetric\/differential thermal analysis (TG\/DTA). The results showed that the precursors are rapidly (t &lt; 3 h) transformed into sodalite, Al <sub>6<\/sub>Na <sub>8<\/sub>(SiO <sub>4<\/sub>) <sub>6<\/sub>Cl <sub>2<\/sub>, and a 2:1 phyllosilicate. For t = 7.5 h, the amount of 2:1 phyllosilicate increased as a result of the decomposition of sodalite, with a progressive incorporation of aluminum in the 2:1 phyllosilicate being observed. For t = 7.5 h, synthesis of Na-4-mica was considered to be complete, as the material remained essentially unaltered for the next 15 h. For t = 30 h, the mica started to decompose, and for very long reaction times (t \u2265 300 h), only forsterite and a carnegierite phase were present.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Na-4-mica, a highly charged fluorophlogopite, has recently attracted much attention because of its unique combination of high charge (four charges per unit cell) and its swelling and cation-exchange properties. The ability to improve the properties of this mica depends on gaining knowledge about its phase evolution during the calcination process. For the synthesis, the stoichiometric&hellip;<\/p>\n","protected":false},"featured_media":28593,"template":"","autores":[],"grupos_de_investigacion":[6508],"revistas":[291],"anos":[894],"destacados":[],"class_list":["post-28589","articulos_sci","type-articulos_sci","status-publish","has-post-thumbnail","hentry","grupos_de_investigacion-materiales-para-energia-y-sostenibilidad","revistas-journal-of-physical-chemistry-c","anos-894","description-off"],"acf":[],"_links":{"self":[{"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=\/wp\/v2\/articulos_sci\/28589","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=\/wp\/v2\/articulos_sci"}],"about":[{"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=\/wp\/v2\/types\/articulos_sci"}],"version-history":[{"count":1,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=\/wp\/v2\/articulos_sci\/28589\/revisions"}],"predecessor-version":[{"id":28594,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=\/wp\/v2\/articulos_sci\/28589\/revisions\/28594"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=\/wp\/v2\/media\/28593"}],"wp:attachment":[{"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=28589"}],"wp:term":[{"taxonomy":"autores","embeddable":true,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=%2Fwp%2Fv2%2Fautores&post=28589"},{"taxonomy":"grupos_de_investigacion","embeddable":true,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=%2Fwp%2Fv2%2Fgrupos_de_investigacion&post=28589"},{"taxonomy":"revistas","embeddable":true,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=%2Fwp%2Fv2%2Frevistas&post=28589"},{"taxonomy":"anos","embeddable":true,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=%2Fwp%2Fv2%2Fanos&post=28589"},{"taxonomy":"destacados","embeddable":true,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=%2Fwp%2Fv2%2Fdestacados&post=28589"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}