Abstract
Compounds of the Yb<inf>14</inf>MnSb<inf>11</inf> structure type are the highest efficiency bulk p-type materials for high temperature thermoelectric applications, with reported figures of merit (ZTs) as high as ∼1.3 at 1275 K. Further optimization of ZT for this structure type is possible with the development of a simple synthetic route. However, this has been difficult to achieve because of the small amount of Mn required compared with Yb and Sb. A simple synthetic route for Yb<inf>14</inf>MnSb<inf>11</inf> has been developed utilizing a combination of ball milling and annealing to produce phase-pure material followed by spark plasma sintering for consolidation. The materials have been characterized by powder X-ray diffraction before and after spark plasma sintering. The stoichiometric reaction of Yb, Sb, and MnSb provides phase-pure powder by X-ray diffraction. Upon cycling to temperatures greater than 1272 K, Yb<inf>14</inf>MnSb<inf>11</inf> shows the presence of Yb<inf>11</inf>Sb<inf>10</inf>. Additional samples with 5% and 10% excess Mn were also investigated. Adding 5-10% excess Mn does not change the low temperature properties and improves the high temperature ZT, resulting in a ZT of 1.1-1.2 at 1000 K for Yb<inf>14</inf>Mn<inf>1.05</inf>Sb<inf>11</inf>, 30-40% improvement over that of the Sn flux reaction. The increase in ZT is attributed to optimization of the carrier concentration. These results provide a reliable method of bulk synthesis of this Zintl phase and open the way for discovery of new compounds with potential for even higher ZT. (Graph Presented).
| Original language | English (US) |
|---|---|
| Pages (from-to) | 5791-5798 |
| Number of pages | 8 |
| Journal | Chemistry of Materials |
| Volume | 27 |
| Issue number | 16 |
| DOIs | |
| State | Published - Aug 25 2015 |
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ASJC Scopus subject areas
- Materials Chemistry
- Chemical Engineering(all)
- Chemistry(all)
Cite this
High Temperature Thermoelectric Properties of Yb<inf>14</inf>MnSb<inf>11</inf> Prepared from Reaction of MnSb with the Elements. / Grebenkemper, Jason H.; Hu, Yufei; Barrett, Dashiel; Gogna, Pawan; Huang, Chen Kuo; Bux, Sabah K.; Kauzlarich, Susan M.
In: Chemistry of Materials, Vol. 27, No. 16, 25.08.2015, p. 5791-5798.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - High Temperature Thermoelectric Properties of Yb14MnSb11 Prepared from Reaction of MnSb with the Elements
AU - Grebenkemper, Jason H.
AU - Hu, Yufei
AU - Barrett, Dashiel
AU - Gogna, Pawan
AU - Huang, Chen Kuo
AU - Bux, Sabah K.
AU - Kauzlarich, Susan M.
PY - 2015/8/25
Y1 - 2015/8/25
N2 - Compounds of the Yb14MnSb11 structure type are the highest efficiency bulk p-type materials for high temperature thermoelectric applications, with reported figures of merit (ZTs) as high as ∼1.3 at 1275 K. Further optimization of ZT for this structure type is possible with the development of a simple synthetic route. However, this has been difficult to achieve because of the small amount of Mn required compared with Yb and Sb. A simple synthetic route for Yb14MnSb11 has been developed utilizing a combination of ball milling and annealing to produce phase-pure material followed by spark plasma sintering for consolidation. The materials have been characterized by powder X-ray diffraction before and after spark plasma sintering. The stoichiometric reaction of Yb, Sb, and MnSb provides phase-pure powder by X-ray diffraction. Upon cycling to temperatures greater than 1272 K, Yb14MnSb11 shows the presence of Yb11Sb10. Additional samples with 5% and 10% excess Mn were also investigated. Adding 5-10% excess Mn does not change the low temperature properties and improves the high temperature ZT, resulting in a ZT of 1.1-1.2 at 1000 K for Yb14Mn1.05Sb11, 30-40% improvement over that of the Sn flux reaction. The increase in ZT is attributed to optimization of the carrier concentration. These results provide a reliable method of bulk synthesis of this Zintl phase and open the way for discovery of new compounds with potential for even higher ZT. (Graph Presented).
AB - Compounds of the Yb14MnSb11 structure type are the highest efficiency bulk p-type materials for high temperature thermoelectric applications, with reported figures of merit (ZTs) as high as ∼1.3 at 1275 K. Further optimization of ZT for this structure type is possible with the development of a simple synthetic route. However, this has been difficult to achieve because of the small amount of Mn required compared with Yb and Sb. A simple synthetic route for Yb14MnSb11 has been developed utilizing a combination of ball milling and annealing to produce phase-pure material followed by spark plasma sintering for consolidation. The materials have been characterized by powder X-ray diffraction before and after spark plasma sintering. The stoichiometric reaction of Yb, Sb, and MnSb provides phase-pure powder by X-ray diffraction. Upon cycling to temperatures greater than 1272 K, Yb14MnSb11 shows the presence of Yb11Sb10. Additional samples with 5% and 10% excess Mn were also investigated. Adding 5-10% excess Mn does not change the low temperature properties and improves the high temperature ZT, resulting in a ZT of 1.1-1.2 at 1000 K for Yb14Mn1.05Sb11, 30-40% improvement over that of the Sn flux reaction. The increase in ZT is attributed to optimization of the carrier concentration. These results provide a reliable method of bulk synthesis of this Zintl phase and open the way for discovery of new compounds with potential for even higher ZT. (Graph Presented).
UR - http://www.scopus.com/inward/record.url?scp=84940030541&partnerID=8YFLogxK
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U2 - 10.1021/acs.chemmater.5b02446
DO - 10.1021/acs.chemmater.5b02446
M3 - Article
AN - SCOPUS:84940030541
VL - 27
SP - 5791
EP - 5798
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 16
ER -