{"id":1473,"date":"2023-01-12T11:48:37","date_gmt":"2023-01-12T11:48:37","guid":{"rendered":"https:\/\/wp.icmm.csic.es\/nanocarma\/?p=1473"},"modified":"2023-01-12T12:03:17","modified_gmt":"2023-01-12T12:03:17","slug":"tem-study-of-%e2%88%bcpbcr2s4-columnar-misfit-phases","status":"publish","type":"post","link":"https:\/\/wp.icmm.csic.es\/nanocarma\/?p=1473","title":{"rendered":"TEM study of \u223cPbCr2S4 columnar misfit phases"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/wp.icmm.csic.es\/nanocarma\/wp-content\/uploads\/sites\/38\/2023\/01\/GomezHerrero2023GraphicalAbstract-300x198.jpg\" alt=\"\" width=\"300\" height=\"198\" class=\"alignnone size-medium wp-image-1479\" srcset=\"https:\/\/wp.icmm.csic.es\/nanocarma\/wp-content\/uploads\/sites\/38\/2023\/01\/GomezHerrero2023GraphicalAbstract-300x198.jpg 300w, https:\/\/wp.icmm.csic.es\/nanocarma\/wp-content\/uploads\/sites\/38\/2023\/01\/GomezHerrero2023GraphicalAbstract.jpg 303w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><br \/>\nThe disordered structure of the columnar misfit&nbsp;\u200b<strong>\u223c<\/strong>&nbsp;\u200bPbCr<sub>2<\/sub>S<sub>4<\/sub> phase (\u223c character indicates that it is close to the stoichiometric composition but slightly away) has been revealed by means of transmission electron microscopy (TEM) varied techniques such as selected area electron diffraction (SAED), high-resolution TEM (HRTEM), dark-field TEM and high-angle annular dark field (HAADF) in scanning-transmision (STEM) mode. The structure consists of a hexagonal framework (Cr<sub>21<\/sub>S<sub>36<\/sub>), with unit cell parameters <em>a<\/em><sub>0<\/sub>&nbsp;\u200b=&nbsp;\u200b<em>b<\/em><sub>0<\/sub>&nbsp;\u200b=&nbsp;\u200b21.407 (1) \u00c5 and <em>c<\/em><sub>0<\/sub>&nbsp;\u200b &nbsp;\u200b3.476 (1), and with hexagonal (Pb<sub>6<\/sub>Cr<sub>2<\/sub>S<sub>6<\/sub>) and trigonal columns (Pb<sub>3<\/sub>S) with the same <em>a<\/em> and <em>b<\/em> parameters and different <em>c: c<\/em><sub>3<\/sub>&nbsp;\u200b=&nbsp;\u200b3.98 \u00c5; <em>c<\/em><sub>6<\/sub>&nbsp;\u200b=&nbsp;\u200b5.62&nbsp;\u200b\u00c5, measured by electron diffraction. While the framework exhibit no crystalline disorder, the arrangement of the two types of columns is disordered. This disorder is shown by electron diffraction as diffuse scattering planes which are perpendicular to the framework <em>c<\/em> axis and parallel to the <em>a\u2217b\u2217<\/em> plane. While the disorder between hexagonal columns is due to the lack of correlation between different columns, we observe in the trigonal columns also the presence of intra-columnar atomic disorder. X-ray wavelength dispersive spectroscopy (XWDS) analyses produce Pb<sub>0.81(1)<\/sub>Cr<sub>2<\/sub>S<sub>3.97(6)<\/sub> composition. TEM imaging techniques suggest lack of correlation between trigonal columns as the cause for the observed disorder as well as inside-the-column structural disorder in Pb<sub>3<\/sub>S trigonal columns.<\/p>\n<p>A. G\u00f3mez-Herrero, A. R. Landa-C\u00e1novas, and L. C. Otero-D\u00edaz, \u201cTEM study of \u223cPbCr<SUB>2<\/SUB>S<SUB>4<\/SUB> columnar misfit phases,\u201d  <a href=\"https:\/\/doi.org\/10.1016\/j.jssc.2022.123826\">J. Solid State Chem. <strong>319<\/strong>, 123826 (2023)<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The disordered structure of the columnar misfit&nbsp;\u200b\u223c&nbsp;\u200bPbCr2S4 phase (\u223c character indicates that it is close to the stoichiometric composition but slightly away) has been revealed by means of transmission electron microscopy (TEM) varied techniques such as selected area electron diffraction &hellip; <a href=\"https:\/\/wp.icmm.csic.es\/nanocarma\/?p=1473\">Sigue leyendo <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":77,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[7,9,10],"tags":[],"class_list":["post-1473","post","type-post","status-publish","format-standard","hentry","category-hrtem","category-microscopy","category-nanocharacterization"],"_links":{"self":[{"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/posts\/1473","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/users\/77"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1473"}],"version-history":[{"count":6,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/posts\/1473\/revisions"}],"predecessor-version":[{"id":1480,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/posts\/1473\/revisions\/1480"}],"wp:attachment":[{"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1473"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1473"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1473"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}