{"id":4556,"date":"2015-05-09T00:39:39","date_gmt":"2015-05-08T22:39:39","guid":{"rendered":"http:\/\/karmaka.de\/?p=4556"},"modified":"2015-05-09T00:43:41","modified_gmt":"2015-05-08T22:43:41","slug":"curious-kinetic-behavior-in-silica-polymorphs-solves-seifertite-puzzle-in-shocked-meteorite","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=4556","title":{"rendered":"Curious kinetic behavior in silica polymorphs solves seifertite puzzle in shocked meteorite"},"content":{"rendered":"<p>Tomoaki Kubo, Takumi Kato, Yuji Higo, Ken-ichi Funakoshi<\/p>\n<p>Science Advances 08 May 2015:<br \/>\nVol. 1 no. 4 e1500075<br \/>\nDOI: 10.1126\/sciadv.1500075<\/p>\n<p><a href=\"http:\/\/advances.sciencemag.org\/content\/1\/4\/e1500075\" target=\"_blank\"><strong>LINK (full text)<\/strong><\/a><\/p>\n<p><a href=\"http:\/\/advances.sciencemag.org\/content\/1\/4\/e1500075.full.pdf\" target=\"_blank\"><strong>PDF (full text)<\/strong><\/a><\/p>\n<div class=\"su-quote su-quote-style-default\"><div class=\"su-quote-inner su-u-clearfix su-u-trim\">The presence of seifertite, one of the high-pressure polymorphs of silica, in achondritic shocked meteorites has been problematic because this phase is thermodynamically stable at more than ~100 GPa, unrealistically high-pressure conditions for the shock events in the early solar system. We conducted in situ x-ray diffraction measurements at high pressure and temperatures, and found that it metastably appears down to ~11 GPa owing to the clear difference in kinetics between the metastable seifertite and stable stishovite formations. The temperature-insensitive but time-sensitive kinetics for the formation of seifertite uniquely constrains that the critical shock duration and size of the impactor on differentiated parental bodies are at least ~0.01 s and ~50 to 100 m, respectively, from the presence of seifertite.<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Tomoaki Kubo, Takumi Kato, Yuji Higo, Ken-ichi Funakoshi Science Advances 08 May 2015: Vol. 1 no. 4 e1500075 DOI: 10.1126\/sciadv.1500075 LINK (full text) PDF (full text)<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28,63],"tags":[1377],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/4556"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4556"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/4556\/revisions"}],"predecessor-version":[{"id":4557,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/4556\/revisions\/4557"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4556"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4556"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4556"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}