Phase Stability, Structures and Properties of the (Bi2)m(Bi2Te3)n Natural Superlattices
The phase stability of the (Bi2)m(Bi2Te3)n natural superlattices has been investigated through the low temperature solid state synthesis of a number of new binary BixTe1-x compositions. Powder X-ray diffraction revealed that an infinitely adaptive series forms for 0.44 < x < 0.70, while an unu...
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| description | The phase stability of the (Bi2)m(Bi2Te3)n natural superlattices has been investigated through the low temperature solid state synthesis of a number of new binary BixTe1-x compositions. Powder X-ray diffraction revealed that an infinitely adaptive series forms for 0.44 < x < 0.70, while an unusual 2-phase region with continuously changing compositions is observed for 0.41 < x < 0.43. For x > 0.70, mixtures of elemental Bi and an almost constant composition (Bi2)m(Bi2Te3)n phase are observed. Rietveld analysis of synchrotron X-ray powder diffraction data collected on Bi2Te (m = 2, n = 1) revealed substantial interchange of Bi and Te between the Bi2 and Bi2Te3 blocks, demonstrating that the block compositions are variable. All investigated phase pure compositions are degenerate semiconductors with low residual resistivity ratios and moderate positive magnetoresistances (R/R0 = 1.05 in 9 T). The maximum Seebeck coefficient is +80 muV K-1 for x = 0.63, leading to an estimated thermoelectric figure of merit, zT = 0.2 at 250 K. |
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Powder X-ray diffraction revealed that an infinitely adaptive series forms for 0.44 < x < 0.70, while an unusual 2-phase region with continuously changing compositions is observed for 0.41 < x < 0.43. For x > 0.70, mixtures of elemental Bi and an almost constant composition (Bi2)m(Bi2Te3)n phase are observed. Rietveld analysis of synchrotron X-ray powder diffraction data collected on Bi2Te (m = 2, n = 1) revealed substantial interchange of Bi and Te between the Bi2 and Bi2Te3 blocks, demonstrating that the block compositions are variable. All investigated phase pure compositions are degenerate semiconductors with low residual resistivity ratios and moderate positive magnetoresistances (R/R0 = 1.05 in 9 T). 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Powder X-ray diffraction revealed that an infinitely adaptive series forms for 0.44 < x < 0.70, while an unusual 2-phase region with continuously changing compositions is observed for 0.41 < x < 0.43. For x > 0.70, mixtures of elemental Bi and an almost constant composition (Bi2)m(Bi2Te3)n phase are observed. Rietveld analysis of synchrotron X-ray powder diffraction data collected on Bi2Te (m = 2, n = 1) revealed substantial interchange of Bi and Te between the Bi2 and Bi2Te3 blocks, demonstrating that the block compositions are variable. All investigated phase pure compositions are degenerate semiconductors with low residual resistivity ratios and moderate positive magnetoresistances (R/R0 = 1.05 in 9 T). The maximum Seebeck coefficient is +80 muV K-1 for x = 0.63, leading to an estimated thermoelectric figure of merit, zT = 0.2 at 250 K.</description><subject>Bismuth tellurides</subject><subject>Composition</subject><subject>Diffraction</subject><subject>Figure of merit</subject><subject>Phase stability</subject><subject>Physics - Materials Science</subject><subject>Residual resistivity</subject><subject>Seebeck effect</subject><subject>Structural stability</subject><subject>Superlattices</subject><subject>Synchrotron radiation</subject><subject>X ray powder diffraction</subject><subject>X-ray diffraction</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GOX</sourceid><recordid>eNotj0tLw0AURgdBsNTuXcmAGwum3nll4lJLfUDRQgMuw00yQ6ekTZ2ZiP33JtbNfcDh4zuEXDGYyUwpuEf_475njIOcgVDpGRlxIViSSc4vyCSELQDwVHOlxIh8rjYYDF1HLF3j4vGuP31Xxc6bQHFf05VvD8ZH17-tpXFj6O2T49PdMHMjpnv6jj2NDV13PdhgjK4y4ZKcW2yCmfzvMcmfF_n8NVl-vLzNH5cJKiYSjVhWssaUIQgNrJLaWlZraTONCkrDjEKbKWFVWiGYkqvSpEwCckQjajEm16fYP-ni4N0O_bEY5ItBvgduTsDBt1-dCbHYtp3f95UKDpnS4kEyIX4B8T1cTQ</recordid><startdate>20120402</startdate><enddate>20120402</enddate><creator>Bos, J -W G</creator><creator>Faucheux, F</creator><creator>Downie, R A</creator><creator>Marcinkova, A</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20120402</creationdate><title>Phase Stability, Structures and Properties of the (Bi2)m(Bi2Te3)n Natural Superlattices</title><author>Bos, J -W G ; Faucheux, F ; Downie, R A ; Marcinkova, A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a513-7aabc4da61a03701c47ff1d74f87a50be1e5af853f56ca0eb25be6140a2aae3d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Bismuth tellurides</topic><topic>Composition</topic><topic>Diffraction</topic><topic>Figure of merit</topic><topic>Phase stability</topic><topic>Physics - Materials Science</topic><topic>Residual resistivity</topic><topic>Seebeck effect</topic><topic>Structural stability</topic><topic>Superlattices</topic><topic>Synchrotron radiation</topic><topic>X ray powder diffraction</topic><topic>X-ray diffraction</topic><toplevel>online_resources</toplevel><creatorcontrib>Bos, J -W G</creatorcontrib><creatorcontrib>Faucheux, F</creatorcontrib><creatorcontrib>Downie, R A</creatorcontrib><creatorcontrib>Marcinkova, A</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Access via ProQuest (Open Access)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bos, J -W G</au><au>Faucheux, F</au><au>Downie, R A</au><au>Marcinkova, A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Phase Stability, Structures and Properties of the (Bi2)m(Bi2Te3)n Natural Superlattices</atitle><jtitle>arXiv.org</jtitle><date>2012-04-02</date><risdate>2012</risdate><eissn>2331-8422</eissn><abstract>The phase stability of the (Bi2)m(Bi2Te3)n natural superlattices has been investigated through the low temperature solid state synthesis of a number of new binary BixTe1-x compositions. Powder X-ray diffraction revealed that an infinitely adaptive series forms for 0.44 < x < 0.70, while an unusual 2-phase region with continuously changing compositions is observed for 0.41 < x < 0.43. For x > 0.70, mixtures of elemental Bi and an almost constant composition (Bi2)m(Bi2Te3)n phase are observed. Rietveld analysis of synchrotron X-ray powder diffraction data collected on Bi2Te (m = 2, n = 1) revealed substantial interchange of Bi and Te between the Bi2 and Bi2Te3 blocks, demonstrating that the block compositions are variable. All investigated phase pure compositions are degenerate semiconductors with low residual resistivity ratios and moderate positive magnetoresistances (R/R0 = 1.05 in 9 T). 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| subjects | Bismuth tellurides Composition Diffraction Figure of merit Phase stability Physics - Materials Science Residual resistivity Seebeck effect Structural stability Superlattices Synchrotron radiation X ray powder diffraction X-ray diffraction |
| title | Phase Stability, Structures and Properties of the (Bi2)m(Bi2Te3)n Natural Superlattices |
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