High Temperature Thermoelectric Properties of the Solid-Solution Zintl Phase Eu<inf>11</inf>Cd<inf>6- x</inf>Zn<inf>x</inf>Sb<inf>12</inf>

Nasrin Kazem, Antonio Hurtado, Fan Sui, Saneyuki Ohno, Alexandra Zevalkink, Jeffrey G. Snyder, Susan M. Kauzlarich

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Abstract

Solid-solution Zintl compounds with the formula Eu<inf>11</inf>Cd<inf>6-x</inf>Zn<inf>x</inf>Sb<inf>12</inf> have been synthesized from the elements as single crystals using a tin flux according to the stoichiometry Eu:Cd:Zn:Sb:Sn of 11:6-x<inf>p</inf>:x<inf>p</inf>:12:30 with x<inf>p</inf> = 0, 1, 2, 3, 4, 5, and 6, where x<inf>p</inf> is the preparative amount of Zn employed in the reaction. The crystal structures and the compositions were established by single-crystal as well as powder X-ray diffraction and wavelength-dispersive X-ray analysis measurements. The title solid-solution Zintl compounds crystallize isostructurally in the centrosymmetric monoclinic space group C 2/m (No. 12, Z = 2) as the Sr<inf>11</inf>Cd<inf>6</inf>Sb<inf>12</inf> structure type (Pearson symbol mC58). There is a miscibility gap at 3 x<inf>p</inf> 4 where the major product crystallizes in a disordered structure related to the Ca<inf>9</inf>Mn<inf>4</inf>Bi<inf>9</inf> structure type; otherwise, for all other compositions, the Sr<inf>11</inf>Cd<inf>6</inf>Sb<inf>12</inf> structure is the majority phase. Eu<inf>11</inf>Cd<inf>6</inf>Sb<inf>12</inf> shows lower lattice thermal conductivity relative to Eu<inf>11</inf>Zn<inf>6</inf>Sb<inf>12</inf> consistent with its higher mean atomic weight, and as anticipated, the solid-solution samples of Eu<inf>11</inf>Cd<inf>6-x</inf>Zn<inf>x</inf>Sb<inf>12</inf> have effectively reduced lattice thermal conductivities relative to the end member compounds. Eu<inf>11.0(1)</inf>Cd<inf>4.5(2)</inf>Zn<inf>1.5(2)</inf>Sb<inf>12.0(1)</inf> exhibits the highest zT value of >0.5 at around 800 K which is twice as large as the end member compounds.

Original languageEnglish (US)
Pages (from-to)4413-4421
Number of pages9
JournalChemistry of Materials
Volume27
Issue number12
DOIs
StatePublished - Jun 23 2015

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Solid solutions
Thermal conductivity
Single crystals
Tin
X ray analysis
Chemical analysis
Stoichiometry
X ray powder diffraction
Temperature
Solubility
Crystal structure
Fluxes
Wavelength

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

High Temperature Thermoelectric Properties of the Solid-Solution Zintl Phase Eu<inf>11</inf>Cd<inf>6- x</inf>Zn<inf>x</inf>Sb<inf>12</inf> / Kazem, Nasrin; Hurtado, Antonio; Sui, Fan; Ohno, Saneyuki; Zevalkink, Alexandra; Snyder, Jeffrey G.; Kauzlarich, Susan M.

In: Chemistry of Materials, Vol. 27, No. 12, 23.06.2015, p. 4413-4421.

Research output: Contribution to journalArticle

Kazem, Nasrin ; Hurtado, Antonio ; Sui, Fan ; Ohno, Saneyuki ; Zevalkink, Alexandra ; Snyder, Jeffrey G. ; Kauzlarich, Susan M. / High Temperature Thermoelectric Properties of the Solid-Solution Zintl Phase Eu<inf>11</inf>Cd<inf>6- x</inf>Zn<inf>x</inf>Sb<inf>12</inf>. In: Chemistry of Materials. 2015 ; Vol. 27, No. 12. pp. 4413-4421.
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title = "High Temperature Thermoelectric Properties of the Solid-Solution Zintl Phase Eu11Cd6- xZnxSb12",
abstract = "Solid-solution Zintl compounds with the formula Eu11Cd6-xZnxSb12 have been synthesized from the elements as single crystals using a tin flux according to the stoichiometry Eu:Cd:Zn:Sb:Sn of 11:6-xp:xp:12:30 with xp = 0, 1, 2, 3, 4, 5, and 6, where xp is the preparative amount of Zn employed in the reaction. The crystal structures and the compositions were established by single-crystal as well as powder X-ray diffraction and wavelength-dispersive X-ray analysis measurements. The title solid-solution Zintl compounds crystallize isostructurally in the centrosymmetric monoclinic space group C 2/m (No. 12, Z = 2) as the Sr11Cd6Sb12 structure type (Pearson symbol mC58). There is a miscibility gap at 3 xp 4 where the major product crystallizes in a disordered structure related to the Ca9Mn4Bi9 structure type; otherwise, for all other compositions, the Sr11Cd6Sb12 structure is the majority phase. Eu11Cd6Sb12 shows lower lattice thermal conductivity relative to Eu11Zn6Sb12 consistent with its higher mean atomic weight, and as anticipated, the solid-solution samples of Eu11Cd6-xZnxSb12 have effectively reduced lattice thermal conductivities relative to the end member compounds. Eu11.0(1)Cd4.5(2)Zn1.5(2)Sb12.0(1) exhibits the highest zT value of >0.5 at around 800 K which is twice as large as the end member compounds.",
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AU - Kazem, Nasrin

AU - Hurtado, Antonio

AU - Sui, Fan

AU - Ohno, Saneyuki

AU - Zevalkink, Alexandra

AU - Snyder, Jeffrey G.

AU - Kauzlarich, Susan M.

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N2 - Solid-solution Zintl compounds with the formula Eu11Cd6-xZnxSb12 have been synthesized from the elements as single crystals using a tin flux according to the stoichiometry Eu:Cd:Zn:Sb:Sn of 11:6-xp:xp:12:30 with xp = 0, 1, 2, 3, 4, 5, and 6, where xp is the preparative amount of Zn employed in the reaction. The crystal structures and the compositions were established by single-crystal as well as powder X-ray diffraction and wavelength-dispersive X-ray analysis measurements. The title solid-solution Zintl compounds crystallize isostructurally in the centrosymmetric monoclinic space group C 2/m (No. 12, Z = 2) as the Sr11Cd6Sb12 structure type (Pearson symbol mC58). There is a miscibility gap at 3 xp 4 where the major product crystallizes in a disordered structure related to the Ca9Mn4Bi9 structure type; otherwise, for all other compositions, the Sr11Cd6Sb12 structure is the majority phase. Eu11Cd6Sb12 shows lower lattice thermal conductivity relative to Eu11Zn6Sb12 consistent with its higher mean atomic weight, and as anticipated, the solid-solution samples of Eu11Cd6-xZnxSb12 have effectively reduced lattice thermal conductivities relative to the end member compounds. Eu11.0(1)Cd4.5(2)Zn1.5(2)Sb12.0(1) exhibits the highest zT value of >0.5 at around 800 K which is twice as large as the end member compounds.

AB - Solid-solution Zintl compounds with the formula Eu11Cd6-xZnxSb12 have been synthesized from the elements as single crystals using a tin flux according to the stoichiometry Eu:Cd:Zn:Sb:Sn of 11:6-xp:xp:12:30 with xp = 0, 1, 2, 3, 4, 5, and 6, where xp is the preparative amount of Zn employed in the reaction. The crystal structures and the compositions were established by single-crystal as well as powder X-ray diffraction and wavelength-dispersive X-ray analysis measurements. The title solid-solution Zintl compounds crystallize isostructurally in the centrosymmetric monoclinic space group C 2/m (No. 12, Z = 2) as the Sr11Cd6Sb12 structure type (Pearson symbol mC58). There is a miscibility gap at 3 xp 4 where the major product crystallizes in a disordered structure related to the Ca9Mn4Bi9 structure type; otherwise, for all other compositions, the Sr11Cd6Sb12 structure is the majority phase. Eu11Cd6Sb12 shows lower lattice thermal conductivity relative to Eu11Zn6Sb12 consistent with its higher mean atomic weight, and as anticipated, the solid-solution samples of Eu11Cd6-xZnxSb12 have effectively reduced lattice thermal conductivities relative to the end member compounds. Eu11.0(1)Cd4.5(2)Zn1.5(2)Sb12.0(1) exhibits the highest zT value of >0.5 at around 800 K which is twice as large as the end member compounds.

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