Single crystal structure elucidation and thermoelectric properties of a long-periodically ordered germanium arsenic telluride
Single-crystal X-ray diffraction revealed that the structure of As2Ge7Te10 = (GeTe)7As2Te3 (space group R 3¯m) consists of rocksalt-type building blocks separated by van der Waals gaps. As and Ge are disordered on some of the cation sites. The rhombohedral 57R stacking sequence results in an extraor...
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Veröffentlicht in: | Journal of alloys and compounds 2017-02, Vol.694, p.1160-1164 |
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description | Single-crystal X-ray diffraction revealed that the structure of As2Ge7Te10 = (GeTe)7As2Te3 (space group R 3¯m) consists of rocksalt-type building blocks separated by van der Waals gaps. As and Ge are disordered on some of the cation sites. The rhombohedral 57R stacking sequence results in an extraordinarily large lattice parameter of c = 103.41 (2) Å. When such structures are formed, the extremely long diffusion pathways required to obtain completely ordered compounds often lead to samples that contain intergrown rocksalt-type slabs with varying thicknesses. As a result, the system (GeTe)nAs2Te3 is prone to form both disordered and inhomogeneous samples, expecially for n > 9. Yet, powder diffraction data reveal that such samples contain 57R-As2Ge7Te10 as a main component. Such inhomogeneous materials exhibit promising thermoelectric properties: the Seebeck coefficient as well as the lattice part of the thermal conductivity are in the same range as germanium antimony tellurides with high figures of merit ZT. However, the high electrical conductivity and consequently the rather dominant electronic component of thermal transport still impede such ZT values for germanium arsenic tellurides.
[Display omitted]
•Single crystals of a new germanium arsenic telluride were synthesized.•(GeTe)7As2Te3 exhibits an extraordinarily long lattice parameter c = 103.41 (2) Å.•The layered structure contains distorted rocksalt-type slabs.•As and Ge are disordered on cation sites near van der Waals gaps.•Thermoelectric figures of merit reach ZT = 0.3 (without any optimization). |
doi_str_mv | 10.1016/j.jallcom.2016.10.104 |
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[Display omitted]
•Single crystals of a new germanium arsenic telluride were synthesized.•(GeTe)7As2Te3 exhibits an extraordinarily long lattice parameter c = 103.41 (2) Å.•The layered structure contains distorted rocksalt-type slabs.•As and Ge are disordered on cation sites near van der Waals gaps.•Thermoelectric figures of merit reach ZT = 0.3 (without any optimization).</description><identifier>ISSN: 0925-8388</identifier><identifier>EISSN: 1873-4669</identifier><identifier>DOI: 10.1016/j.jallcom.2016.10.104</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Antimony ; Antimony telluride ; Arsenic ; Cation disorder ; Crystal structure ; Crystal structure determination ; Diffraction ; Electrical resistivity ; Germanium ; Germanium antimony telluride ; Heat conductivity ; Heat transfer ; Intermetallic compounds ; Single crystals ; Stacking sequence (composite materials) ; Synchrotron radiation ; Thermal conductivity ; Thermoelectric materials ; Thermoelectrics</subject><ispartof>Journal of alloys and compounds, 2017-02, Vol.694, p.1160-1164</ispartof><rights>2016 Elsevier B.V.</rights><rights>Copyright Elsevier BV Feb 15, 2017</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c337t-f7479ee33aead75e5600998c6e69c8b292c505ceb006897afd3296d7de5360843</citedby><cites>FETCH-LOGICAL-c337t-f7479ee33aead75e5600998c6e69c8b292c505ceb006897afd3296d7de5360843</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jallcom.2016.10.104$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Nentwig, Markus</creatorcontrib><creatorcontrib>Fahrnbauer, Felix</creatorcontrib><creatorcontrib>Kasprick, Marcus</creatorcontrib><creatorcontrib>Oeckler, Oliver</creatorcontrib><title>Single crystal structure elucidation and thermoelectric properties of a long-periodically ordered germanium arsenic telluride</title><title>Journal of alloys and compounds</title><description>Single-crystal X-ray diffraction revealed that the structure of As2Ge7Te10 = (GeTe)7As2Te3 (space group R 3¯m) consists of rocksalt-type building blocks separated by van der Waals gaps. As and Ge are disordered on some of the cation sites. The rhombohedral 57R stacking sequence results in an extraordinarily large lattice parameter of c = 103.41 (2) Å. When such structures are formed, the extremely long diffusion pathways required to obtain completely ordered compounds often lead to samples that contain intergrown rocksalt-type slabs with varying thicknesses. As a result, the system (GeTe)nAs2Te3 is prone to form both disordered and inhomogeneous samples, expecially for n > 9. Yet, powder diffraction data reveal that such samples contain 57R-As2Ge7Te10 as a main component. Such inhomogeneous materials exhibit promising thermoelectric properties: the Seebeck coefficient as well as the lattice part of the thermal conductivity are in the same range as germanium antimony tellurides with high figures of merit ZT. However, the high electrical conductivity and consequently the rather dominant electronic component of thermal transport still impede such ZT values for germanium arsenic tellurides.
[Display omitted]
•Single crystals of a new germanium arsenic telluride were synthesized.•(GeTe)7As2Te3 exhibits an extraordinarily long lattice parameter c = 103.41 (2) Å.•The layered structure contains distorted rocksalt-type slabs.•As and Ge are disordered on cation sites near van der Waals gaps.•Thermoelectric figures of merit reach ZT = 0.3 (without any optimization).</description><subject>Antimony</subject><subject>Antimony telluride</subject><subject>Arsenic</subject><subject>Cation disorder</subject><subject>Crystal structure</subject><subject>Crystal structure determination</subject><subject>Diffraction</subject><subject>Electrical resistivity</subject><subject>Germanium</subject><subject>Germanium antimony telluride</subject><subject>Heat conductivity</subject><subject>Heat transfer</subject><subject>Intermetallic compounds</subject><subject>Single crystals</subject><subject>Stacking sequence (composite materials)</subject><subject>Synchrotron radiation</subject><subject>Thermal conductivity</subject><subject>Thermoelectric materials</subject><subject>Thermoelectrics</subject><issn>0925-8388</issn><issn>1873-4669</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNqFkE9LxDAQxYMouK5-BCHguWvatGlzEln8B4IH9RxiMl1Tss06SYU9-N3Nunv3NMxj3puZHyGXJVuUrBTXw2LQ3puwXlS5XfzJ9RGZlV3Li1oIeUxmTFZN0fGuOyVnMQ6MsVLyckZ-Xt248kANbmPSnsaEk0kTAgU_GWd1cmGkerQ0fQKuA3gwCZ2hGwwbwOQg0tBTTX0YV0VWXLDO5HO2NKAFBEtX2adHN62pxghj9ibwfkJn4Zyc9NpHuDjUOXm_v3tbPhbPLw9Py9vnwnDepqJv61YCcK5B27aBRjAmZWcECGm6j0pWpmGNgQ_GRCdb3VteSWFbCw0XrKv5nFztc_PVXxPEpIYw4ZhXqoyhZm1GVeWpZj9lMMSI0KsNurXGrSqZ2pFWgzqQVjvSe3mXfrP3QX7h2wGqaByMBqzDTEvZ4P5J-AV8c40b</recordid><startdate>20170215</startdate><enddate>20170215</enddate><creator>Nentwig, Markus</creator><creator>Fahrnbauer, Felix</creator><creator>Kasprick, Marcus</creator><creator>Oeckler, Oliver</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20170215</creationdate><title>Single crystal structure elucidation and thermoelectric properties of a long-periodically ordered germanium arsenic telluride</title><author>Nentwig, Markus ; Fahrnbauer, Felix ; Kasprick, Marcus ; Oeckler, Oliver</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c337t-f7479ee33aead75e5600998c6e69c8b292c505ceb006897afd3296d7de5360843</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Antimony</topic><topic>Antimony telluride</topic><topic>Arsenic</topic><topic>Cation disorder</topic><topic>Crystal structure</topic><topic>Crystal structure determination</topic><topic>Diffraction</topic><topic>Electrical resistivity</topic><topic>Germanium</topic><topic>Germanium antimony telluride</topic><topic>Heat conductivity</topic><topic>Heat transfer</topic><topic>Intermetallic compounds</topic><topic>Single crystals</topic><topic>Stacking sequence (composite materials)</topic><topic>Synchrotron radiation</topic><topic>Thermal conductivity</topic><topic>Thermoelectric materials</topic><topic>Thermoelectrics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Nentwig, Markus</creatorcontrib><creatorcontrib>Fahrnbauer, Felix</creatorcontrib><creatorcontrib>Kasprick, Marcus</creatorcontrib><creatorcontrib>Oeckler, Oliver</creatorcontrib><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of alloys and compounds</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Nentwig, Markus</au><au>Fahrnbauer, Felix</au><au>Kasprick, Marcus</au><au>Oeckler, Oliver</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Single crystal structure elucidation and thermoelectric properties of a long-periodically ordered germanium arsenic telluride</atitle><jtitle>Journal of alloys and compounds</jtitle><date>2017-02-15</date><risdate>2017</risdate><volume>694</volume><spage>1160</spage><epage>1164</epage><pages>1160-1164</pages><issn>0925-8388</issn><eissn>1873-4669</eissn><abstract>Single-crystal X-ray diffraction revealed that the structure of As2Ge7Te10 = (GeTe)7As2Te3 (space group R 3¯m) consists of rocksalt-type building blocks separated by van der Waals gaps. As and Ge are disordered on some of the cation sites. The rhombohedral 57R stacking sequence results in an extraordinarily large lattice parameter of c = 103.41 (2) Å. When such structures are formed, the extremely long diffusion pathways required to obtain completely ordered compounds often lead to samples that contain intergrown rocksalt-type slabs with varying thicknesses. As a result, the system (GeTe)nAs2Te3 is prone to form both disordered and inhomogeneous samples, expecially for n > 9. Yet, powder diffraction data reveal that such samples contain 57R-As2Ge7Te10 as a main component. Such inhomogeneous materials exhibit promising thermoelectric properties: the Seebeck coefficient as well as the lattice part of the thermal conductivity are in the same range as germanium antimony tellurides with high figures of merit ZT. However, the high electrical conductivity and consequently the rather dominant electronic component of thermal transport still impede such ZT values for germanium arsenic tellurides.
[Display omitted]
•Single crystals of a new germanium arsenic telluride were synthesized.•(GeTe)7As2Te3 exhibits an extraordinarily long lattice parameter c = 103.41 (2) Å.•The layered structure contains distorted rocksalt-type slabs.•As and Ge are disordered on cation sites near van der Waals gaps.•Thermoelectric figures of merit reach ZT = 0.3 (without any optimization).</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jallcom.2016.10.104</doi><tpages>5</tpages></addata></record> |
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subjects | Antimony Antimony telluride Arsenic Cation disorder Crystal structure Crystal structure determination Diffraction Electrical resistivity Germanium Germanium antimony telluride Heat conductivity Heat transfer Intermetallic compounds Single crystals Stacking sequence (composite materials) Synchrotron radiation Thermal conductivity Thermoelectric materials Thermoelectrics |
title | Single crystal structure elucidation and thermoelectric properties of a long-periodically ordered germanium arsenic telluride |
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