{"id":948,"date":"2021-11-21T19:47:33","date_gmt":"2021-11-21T19:47:33","guid":{"rendered":"http:\/\/www.calm-ebsd.com\/?page_id=948"},"modified":"2021-12-27T07:32:46","modified_gmt":"2021-12-27T07:32:46","slug":"rules-for-bands","status":"publish","type":"page","link":"https:\/\/www.calm-ebsd.com\/index.php\/how-to-start\/rules-for-bands\/","title":{"rendered":"Manual band search"},"content":{"rendered":"\n<p>There are a few <strong>rules<\/strong> in crystallography <strong>to predict<\/strong> possible <strong>band positions<\/strong>. These are only rules since finally the crystal structure (distribution of atoms in the unit cell) decides whether a band becomes visible or not. <\/p>\n\n\n\n<p>If you search for not yet discovered bands, feel free to follow some recommendations:<\/p>\n\n\n\n<ul><li><strong>Look<\/strong> for intersections <strong>between strong<\/strong> poles <strong>[hkl]*<\/strong> in the Funk transformation!<br><em>If a zone (great circle) already conotains a high number of poles, it is very likely that at intersection with other great circles not yet discovered bands exist.<\/em><\/li><li><strong>Connect strong poles<\/strong> [hkl]* to define their zone axis and <strong>check new intersection<\/strong> with other great circles!<br><em>They<\/em> are <em>often not obvious since bands are sometimes too low intense for the naked eye.<\/em><\/li><li><strong>Connect<\/strong> preferably [hkl]* with <strong>small bandwidths<\/strong> in Funk transformation to define low-indexed zone axes [uvw]!<br><em>Other [hkl]* along this (uvw)* are very likely low indexed as well. <\/em><\/li><\/ul>\n\n\n\n<p>Many of the so defined bands can have a too low intensity or only display a single band edge only. Such bands are meaningless, except they can be used to define other usable bands.<\/p>\n\n\n\n<p>Finally a few further recommendations:<\/p>\n\n\n\n<ul><li><strong>Try to find as many as possible bands.<\/strong><br><em>Each additional band which confirms your lattice solution reduces the danger of misinterpretation. <\/em><\/li><li><strong>Prevent asymmetric bands.<\/strong> <br><em>Since not used they become only disturbing the more bands you discover.<\/em><\/li><li><strong>Switch on the check box in  the menu &#8220;Lattice solutions<\/strong>&#8220;. <br><em>Sometimes profiles accidentally look like reliable bands! You should be sceptic, if a bandwidth generates a reciprocal lattice point which changes the lattice solution. This can happen (e.g. in the case of hematite), but it can be also a fake band. Then it is time to check the 3D presentation.<\/em>  <\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>There are a few rules in crystallography to predict possible band positions. These are only rules since finally the crystal structure (distribution of atoms in the unit cell) decides whether a band becomes visible or not. If you search for <a href=\"https:\/\/www.calm-ebsd.com\/index.php\/how-to-start\/rules-for-bands\/\" class=\"read-more\">Read More &#8230;<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"parent":168,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.calm-ebsd.com\/index.php\/wp-json\/wp\/v2\/pages\/948"}],"collection":[{"href":"https:\/\/www.calm-ebsd.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.calm-ebsd.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.calm-ebsd.com\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.calm-ebsd.com\/index.php\/wp-json\/wp\/v2\/comments?post=948"}],"version-history":[{"count":13,"href":"https:\/\/www.calm-ebsd.com\/index.php\/wp-json\/wp\/v2\/pages\/948\/revisions"}],"predecessor-version":[{"id":1763,"href":"https:\/\/www.calm-ebsd.com\/index.php\/wp-json\/wp\/v2\/pages\/948\/revisions\/1763"}],"up":[{"embeddable":true,"href":"https:\/\/www.calm-ebsd.com\/index.php\/wp-json\/wp\/v2\/pages\/168"}],"wp:attachment":[{"href":"https:\/\/www.calm-ebsd.com\/index.php\/wp-json\/wp\/v2\/media?parent=948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}