Enhanced thermoelectric power factor in Yb1−xScxAl2 alloys using chemical pressure tuning of the Yb valence
We have investigated the influence of Sc substitution on the transport and magnetic properties of YbAl2, a well-known intermediate valence compound. Sc substitution provides a chemical pressure that decreases the lattice constant and thereby alters the Yb valence as a function of composition and tem...
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| Veröffentlicht in: | Journal of applied physics 2013-12, Vol.114 (22) |
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| container_title | Journal of applied physics |
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| creator | Lehr, Gloria J. Morelli, Donald T. Jin, Hyungyu Heremans, Joseph P. |
| description | We have investigated the influence of Sc substitution on the transport and magnetic properties of YbAl2, a well-known intermediate valence compound. Sc substitution provides a chemical pressure that decreases the lattice constant and thereby alters the Yb valence as a function of composition and temperature. We observe a strong correlation between the Seebeck coefficient and the ratio of trivalent to divalent Yb in these compounds, as determined from magnetic susceptibility measurements. This correlation indicates that the largest absolute value of the Seebeck coefficient is achieved when the average Yb valence is near 2.5 (the ratio of divalent to trivalent Yb is 1:1). It is shown that Sc concentration can be used as a means to tune both the magnitude of the maximum of the Seebeck coefficient and the temperature at which this absolute maximum occurs, improving the prospects of the use of these materials in cryogenic Peltier coolers. |
| doi_str_mv | 10.1063/1.4842795 |
| format | Article |
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Sc substitution provides a chemical pressure that decreases the lattice constant and thereby alters the Yb valence as a function of composition and temperature. We observe a strong correlation between the Seebeck coefficient and the ratio of trivalent to divalent Yb in these compounds, as determined from magnetic susceptibility measurements. This correlation indicates that the largest absolute value of the Seebeck coefficient is achieved when the average Yb valence is near 2.5 (the ratio of divalent to trivalent Yb is 1:1). It is shown that Sc concentration can be used as a means to tune both the magnitude of the maximum of the Seebeck coefficient and the temperature at which this absolute maximum occurs, improving the prospects of the use of these materials in cryogenic Peltier coolers.</description><identifier>ISSN: 0021-8979</identifier><identifier>EISSN: 1089-7550</identifier><identifier>DOI: 10.1063/1.4842795</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Alloys ; Applied physics ; Coolers ; Correlation analysis ; Lattice parameters ; Magnetic permeability ; Magnetic properties ; Organic chemistry ; Power factor ; Scandium ; Seebeck effect ; Substitutes</subject><ispartof>Journal of applied physics, 2013-12, Vol.114 (22)</ispartof><rights>2013 AIP Publishing LLC.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c286t-59d4412961fb8dc5c37210cbffabf4c9206f00436d48d3e0e6ff3a4824344c1b3</citedby><cites>FETCH-LOGICAL-c286t-59d4412961fb8dc5c37210cbffabf4c9206f00436d48d3e0e6ff3a4824344c1b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27922,27923</link.rule.ids></links><search><creatorcontrib>Lehr, Gloria J.</creatorcontrib><creatorcontrib>Morelli, Donald T.</creatorcontrib><creatorcontrib>Jin, Hyungyu</creatorcontrib><creatorcontrib>Heremans, Joseph P.</creatorcontrib><title>Enhanced thermoelectric power factor in Yb1−xScxAl2 alloys using chemical pressure tuning of the Yb valence</title><title>Journal of applied physics</title><description>We have investigated the influence of Sc substitution on the transport and magnetic properties of YbAl2, a well-known intermediate valence compound. Sc substitution provides a chemical pressure that decreases the lattice constant and thereby alters the Yb valence as a function of composition and temperature. We observe a strong correlation between the Seebeck coefficient and the ratio of trivalent to divalent Yb in these compounds, as determined from magnetic susceptibility measurements. This correlation indicates that the largest absolute value of the Seebeck coefficient is achieved when the average Yb valence is near 2.5 (the ratio of divalent to trivalent Yb is 1:1). It is shown that Sc concentration can be used as a means to tune both the magnitude of the maximum of the Seebeck coefficient and the temperature at which this absolute maximum occurs, improving the prospects of the use of these materials in cryogenic Peltier coolers.</description><subject>Alloys</subject><subject>Applied physics</subject><subject>Coolers</subject><subject>Correlation analysis</subject><subject>Lattice parameters</subject><subject>Magnetic permeability</subject><subject>Magnetic properties</subject><subject>Organic chemistry</subject><subject>Power factor</subject><subject>Scandium</subject><subject>Seebeck effect</subject><subject>Substitutes</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNpdkLtOwzAUhi0EEqUw8AaWWGBI8S2OPVZVuUiVGICByXIcm6Zy4mIn0L4BM4_Ik5CqnZjOcL7_P0cfAJcYTTDi9BZPmGCkkPkRGGEkZFbkOToGI4QIzoQs5Ck4S2mFEMaCyhFo5u1St8ZWsFva2ATrrelibeA6fNkInTZdiLBu4VuJf79_Ns9mM_UEau_DNsE-1e07NEvb1EZ7uI42pT5a2PXtbhHcrnWIwk_t7XDlHJw47ZO9OMwxeL2bv8wessXT_eNsusgMEbzLclkxhonk2JWiMrmhBcHIlM7p0jEjCeIOIUZ5xURFLbLcOaqZIIwyZnBJx-B637uO4aO3qVNNnYz1Xrc29EnhfHA1eGL5gF79Q1ehj-3wnSKYFAUvJBcDdbOnTAwpRevUOtaNjluFkdqJV1gdxNM_l-J16A</recordid><startdate>20131214</startdate><enddate>20131214</enddate><creator>Lehr, Gloria J.</creator><creator>Morelli, Donald T.</creator><creator>Jin, Hyungyu</creator><creator>Heremans, Joseph P.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7U5</scope><scope>8BQ</scope><scope>H8G</scope><scope>JG9</scope></search><sort><creationdate>20131214</creationdate><title>Enhanced thermoelectric power factor in Yb1−xScxAl2 alloys using chemical pressure tuning of the Yb valence</title><author>Lehr, Gloria J. ; Morelli, Donald T. ; Jin, Hyungyu ; Heremans, Joseph P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c286t-59d4412961fb8dc5c37210cbffabf4c9206f00436d48d3e0e6ff3a4824344c1b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Alloys</topic><topic>Applied physics</topic><topic>Coolers</topic><topic>Correlation analysis</topic><topic>Lattice parameters</topic><topic>Magnetic permeability</topic><topic>Magnetic properties</topic><topic>Organic chemistry</topic><topic>Power factor</topic><topic>Scandium</topic><topic>Seebeck effect</topic><topic>Substitutes</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lehr, Gloria J.</creatorcontrib><creatorcontrib>Morelli, Donald T.</creatorcontrib><creatorcontrib>Jin, Hyungyu</creatorcontrib><creatorcontrib>Heremans, Joseph P.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Copper Technical Reference Library</collection><collection>Materials Research Database</collection><jtitle>Journal of applied physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lehr, Gloria J.</au><au>Morelli, Donald T.</au><au>Jin, Hyungyu</au><au>Heremans, Joseph P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Enhanced thermoelectric power factor in Yb1−xScxAl2 alloys using chemical pressure tuning of the Yb valence</atitle><jtitle>Journal of applied physics</jtitle><date>2013-12-14</date><risdate>2013</risdate><volume>114</volume><issue>22</issue><issn>0021-8979</issn><eissn>1089-7550</eissn><abstract>We have investigated the influence of Sc substitution on the transport and magnetic properties of YbAl2, a well-known intermediate valence compound. Sc substitution provides a chemical pressure that decreases the lattice constant and thereby alters the Yb valence as a function of composition and temperature. We observe a strong correlation between the Seebeck coefficient and the ratio of trivalent to divalent Yb in these compounds, as determined from magnetic susceptibility measurements. This correlation indicates that the largest absolute value of the Seebeck coefficient is achieved when the average Yb valence is near 2.5 (the ratio of divalent to trivalent Yb is 1:1). It is shown that Sc concentration can be used as a means to tune both the magnitude of the maximum of the Seebeck coefficient and the temperature at which this absolute maximum occurs, improving the prospects of the use of these materials in cryogenic Peltier coolers.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4842795</doi></addata></record> |
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| source | AIP Journals Complete; AIP Digital Archive; Alma/SFX Local Collection |
| subjects | Alloys Applied physics Coolers Correlation analysis Lattice parameters Magnetic permeability Magnetic properties Organic chemistry Power factor Scandium Seebeck effect Substitutes |
| title | Enhanced thermoelectric power factor in Yb1−xScxAl2 alloys using chemical pressure tuning of the Yb valence |
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