{"id":29992,"date":"2022-01-27T14:43:11","date_gmt":"2022-01-27T13:43:11","guid":{"rendered":"https:\/\/karmaka.de\/?p=29992"},"modified":"2022-01-27T14:46:44","modified_gmt":"2022-01-27T13:46:44","slug":"bulk-synthesis-of-stoichiometric-meteoritic-troilite-fes-by-high-temperature-pyrite-decomposition-and-pyrrhotite-melting","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=29992","title":{"rendered":"Bulk synthesis of stoichiometric\/meteoritic troilite (FeS) by high-temperature pyrite decomposition and pyrrhotite melting<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Juulia-Gabrielle Moreau, Argo J\u00f5eleht, Jaan Aruv\u00e4li, Mikko J. Heikkil\u00e4, Aleksandra N. Stojic, Thomas Thomberg, J\u00fcri Plado, Satu Hietala<\/p>\n\n\n\n<p>MAPS<br>Version of Record online: 27 January 2022<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.13782\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.13782\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Stoichiometric troilite (FeS) is a common phase in differentiated and undifferentiated meteorites. It is the endmember of the iron sulfide system. Troilite is important for investigating shock metamorphism in meteorites and studying spectral properties and space weathering of planetary bodies. Thus, obtaining coarse-grained meteoritic troilite in quantities is beneficial for these fields. The previous synthesis of troilite was achieved by pyrite or pyrrhotite heating treatments or chemical syntheses. However, most of these works lacked a visual characterization of the step by step process and the final product, the production of large quantities, and they were not readily advertised to planetary scientists or the meteoritical research community. Here, we illustrate a two-step heat treatment of pyrite to synthesize troilite. Pyrite powder was decomposed to pyrrhotite at 1023\u20131073\u2009K for 4\u20136\u2009h in Ar; the run product was then retrieved and reheated for 1\u2009h at 1498\u20131598\u2009K in N2 (gas). The minerals were analyzed with a scanning electron microscope, X-ray diffraction (XRD) at room temperature, and in situ high-temperature XRD. The primary observation of synthesis from pyrrhotite to troilite is the shift of a major diffraction peak from ~43.2\u00b02\u03b8 to ~43.8\u00b02\u03b8. Troilite spectra matched an XRD analysis of natural meteoritic troilite. Slight contamination of Fe was observed during cooling to troilite, and alumina crucibles locally reacted with troilite. The habitus and size of troilite crystals allowed us to store it as large grains rather than powder; 27 g of pyrite yielded 17 g of stochiometric troilite.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Juulia-Gabrielle Moreau, Argo J\u00f5eleht, Jaan Aruv\u00e4li, Mikko J. Heikkil\u00e4, Aleksandra N. Stojic, Thomas Thomberg, J\u00fcri Plado, Satu Hietala MAPSVersion of Record online: 27 January 2022 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;Stoichiometric troilite (FeS) is a&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[214,8,7,73,130,63,3504],"tags":[1844,673,202,561],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/29992"}],"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=29992"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/29992\/revisions"}],"predecessor-version":[{"id":29993,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/29992\/revisions\/29993"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=29992"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29992"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29992"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}