Cation diffusion patterns across the magneto-structural transition in Fe7S8
Migration of atoms in solids during diffusion-dependent reactions is relatively fast and generally not directly recordable in experiments. Here we present an experimental framework that includes fast differential scanning calorimetry to resolve cation-migration paths in crystalline solids using the...
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| Veröffentlicht in: | Physical chemistry chemical physics : PCCP 2019, Vol.21 (24), p.13040-13046 |
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| container_title | Physical chemistry chemical physics : PCCP |
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| creator | Koulialias, Dimitrios Weidler, Peter G Charilaou, Michalis Löffler, Jörg F Gehring, Andreas U |
| description | Migration of atoms in solids during diffusion-dependent reactions is relatively fast and generally not directly recordable in experiments. Here we present an experimental framework that includes fast differential scanning calorimetry to resolve cation-migration paths in crystalline solids using the reversible magneto-structural transition of 4C to 1C pyrrhotite as a testbed. The transition between these two polymorphic Fe7S8 phases at about 600 K is a diffusive process of vacancies, respectively of Fe in octahedral interstitial sites within a hexagonal close-packed lattice of sulfur, and it coincides with the Curie temperature of 4C pyrrhotite. The Fe cations migrate along three kinds of diffusion paths, and their enthalpy contributions to the total reaction enthalpy are taken to define the diffusion patterns in the endothermic reaction and the exothermic back-reaction, respectively. Our experimental findings provide insight into the potential of diffusion patterns to disentangle ordering mechanisms in solids. |
| doi_str_mv | 10.1039/c9cp01387c |
| format | Article |
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Here we present an experimental framework that includes fast differential scanning calorimetry to resolve cation-migration paths in crystalline solids using the reversible magneto-structural transition of 4C to 1C pyrrhotite as a testbed. The transition between these two polymorphic Fe7S8 phases at about 600 K is a diffusive process of vacancies, respectively of Fe in octahedral interstitial sites within a hexagonal close-packed lattice of sulfur, and it coincides with the Curie temperature of 4C pyrrhotite. The Fe cations migrate along three kinds of diffusion paths, and their enthalpy contributions to the total reaction enthalpy are taken to define the diffusion patterns in the endothermic reaction and the exothermic back-reaction, respectively. 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Here we present an experimental framework that includes fast differential scanning calorimetry to resolve cation-migration paths in crystalline solids using the reversible magneto-structural transition of 4C to 1C pyrrhotite as a testbed. The transition between these two polymorphic Fe7S8 phases at about 600 K is a diffusive process of vacancies, respectively of Fe in octahedral interstitial sites within a hexagonal close-packed lattice of sulfur, and it coincides with the Curie temperature of 4C pyrrhotite. The Fe cations migrate along three kinds of diffusion paths, and their enthalpy contributions to the total reaction enthalpy are taken to define the diffusion patterns in the endothermic reaction and the exothermic back-reaction, respectively. Our experimental findings provide insight into the potential of diffusion patterns to disentangle ordering mechanisms in solids.</description><subject>Cations</subject><subject>Close packed lattices</subject><subject>Curie temperature</subject><subject>Diffusion rate</subject><subject>Endothermic reactions</subject><subject>Enthalpy</subject><subject>Exothermic reactions</subject><subject>Hexagonal lattice</subject><subject>Lattice vacancies</subject><subject>Pyrrhotite</subject><issn>1463-9076</issn><issn>1463-9084</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNpdjj1PwzAURS0EEqWw8AsssbAEbD87cUYUUUBUYgDm6sWxS6rUCf74_zSAGJjuGc69uoRccnbDGdS3pjYT46Arc0QWXJZQ1EzL4z-uylNyFuOOMcYVhwV5bjD1o6dd71yOM02Ykg0-UjRhjJGmD0v3uPU2jUVMIZuUAw40BfSx_-72nq5s9arPyYnDIdqL31yS99X9W_NYrF8enpq7dbEVuk6FqhS02GHJQaLolOqcrLoWmcDOOIPo7AFlaaACqYUTwMvWCC6dVNIKgCW5_tmdwviZbUybfR-NHQb0dsxxI4Sciwr0Qb36p-7GHPzh3WwJzUrONHwBTsxdJA</recordid><startdate>2019</startdate><enddate>2019</enddate><creator>Koulialias, Dimitrios</creator><creator>Weidler, Peter G</creator><creator>Charilaou, Michalis</creator><creator>Löffler, Jörg F</creator><creator>Gehring, Andreas U</creator><general>Royal Society of Chemistry</general><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope><scope>7X8</scope></search><sort><creationdate>2019</creationdate><title>Cation diffusion patterns across the magneto-structural transition in Fe7S8</title><author>Koulialias, Dimitrios ; Weidler, Peter G ; Charilaou, Michalis ; Löffler, Jörg F ; Gehring, Andreas U</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-g289t-5753bada6134a2d55df47dba02adcfcaafe02a46c373482f2316bc214f454e233</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Cations</topic><topic>Close packed lattices</topic><topic>Curie temperature</topic><topic>Diffusion rate</topic><topic>Endothermic reactions</topic><topic>Enthalpy</topic><topic>Exothermic reactions</topic><topic>Hexagonal lattice</topic><topic>Lattice vacancies</topic><topic>Pyrrhotite</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Koulialias, Dimitrios</creatorcontrib><creatorcontrib>Weidler, Peter G</creatorcontrib><creatorcontrib>Charilaou, Michalis</creatorcontrib><creatorcontrib>Löffler, Jörg F</creatorcontrib><creatorcontrib>Gehring, Andreas U</creatorcontrib><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>Physical chemistry chemical physics : PCCP</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Koulialias, Dimitrios</au><au>Weidler, Peter G</au><au>Charilaou, Michalis</au><au>Löffler, Jörg F</au><au>Gehring, Andreas U</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Cation diffusion patterns across the magneto-structural transition in Fe7S8</atitle><jtitle>Physical chemistry chemical physics : PCCP</jtitle><date>2019</date><risdate>2019</risdate><volume>21</volume><issue>24</issue><spage>13040</spage><epage>13046</epage><pages>13040-13046</pages><issn>1463-9076</issn><eissn>1463-9084</eissn><abstract>Migration of atoms in solids during diffusion-dependent reactions is relatively fast and generally not directly recordable in experiments. 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| source | Royal Society Of Chemistry Journals 2008-; Alma/SFX Local Collection |
| subjects | Cations Close packed lattices Curie temperature Diffusion rate Endothermic reactions Enthalpy Exothermic reactions Hexagonal lattice Lattice vacancies Pyrrhotite |
| title | Cation diffusion patterns across the magneto-structural transition in Fe7S8 |
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