Enhancement in the thermoelectric performance by y substitution on SrSi2

C. S. Lue; M. D. Chou; N. Kaurav; Y. T. Chung; Y. K. Kuo

doi:10.1063/1.3136847

Enhancement in the thermoelectric performance by y substitution on SrSi₂

C. S. Lue, M. D. Chou, N. Kaurav, Y. T. Chung, Y. K. Kuo

Department of Physics

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

We report the results of the Y substitution in Sr_1-xY _xSi₂ with x≤0.15 via measuring the temperature- dependent electrical resistivity, thermal conductivity, as well as Seebeck coefficient. Upon substituting Y onto the Sr sites, the electrical resistivity exhibit semiconducting behavior and the room-temperature electrical resistivity tends to reduce for x≤0.08. The thermal conductivity also decreases with increasing the Y content. Moreover, the Seebeck coefficient has a substantial increase and a maximum of about 220 μV/K at around 80 K has been found for x=0.08. These promising effects lead to a significant enhancement in the thermoelectric performance characterized by the figure-of-merit, ZT. A room-temperature ZT value of approximately 0.4 is thus achieved for Sr _0.92 Y_0.08 Si₂, about one order of magnitude larger than that of stoichiometric SrSi₂.

Original language	English
Article number	192105
Journal	Applied Physics Letters
Volume	94
Issue number	19
DOIs	https://doi.org/10.1063/1.3136847
Publication status	Published - 2009

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3136847

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title = "Enhancement in the thermoelectric performance by y substitution on SrSi2",

abstract = "We report the results of the Y substitution in Sr1-xY xSi2 with x≤0.15 via measuring the temperature- dependent electrical resistivity, thermal conductivity, as well as Seebeck coefficient. Upon substituting Y onto the Sr sites, the electrical resistivity exhibit semiconducting behavior and the room-temperature electrical resistivity tends to reduce for x≤0.08. The thermal conductivity also decreases with increasing the Y content. Moreover, the Seebeck coefficient has a substantial increase and a maximum of about 220 μV/K at around 80 K has been found for x=0.08. These promising effects lead to a significant enhancement in the thermoelectric performance characterized by the figure-of-merit, ZT. A room-temperature ZT value of approximately 0.4 is thus achieved for Sr 0.92 Y0.08 Si2, about one order of magnitude larger than that of stoichiometric SrSi2.",

author = "Lue, {C. S.} and Chou, {M. D.} and N. Kaurav and Chung, {Y. T.} and Kuo, {Y. K.}",

note = "Funding Information: This work was supported by National Science Council, Taiwan under Grant Nos. 97-2628-M-259-001-MY3 (YKK) and NSC-95-2112-M-006-021 (CSL).",

year = "2009",

doi = "10.1063/1.3136847",

language = "English",

volume = "94",

journal = "Applied Physics Letters",

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T1 - Enhancement in the thermoelectric performance by y substitution on SrSi2

AU - Lue, C. S.

AU - Chou, M. D.

AU - Kaurav, N.

AU - Chung, Y. T.

AU - Kuo, Y. K.

N1 - Funding Information: This work was supported by National Science Council, Taiwan under Grant Nos. 97-2628-M-259-001-MY3 (YKK) and NSC-95-2112-M-006-021 (CSL).

PY - 2009

Y1 - 2009

N2 - We report the results of the Y substitution in Sr1-xY xSi2 with x≤0.15 via measuring the temperature- dependent electrical resistivity, thermal conductivity, as well as Seebeck coefficient. Upon substituting Y onto the Sr sites, the electrical resistivity exhibit semiconducting behavior and the room-temperature electrical resistivity tends to reduce for x≤0.08. The thermal conductivity also decreases with increasing the Y content. Moreover, the Seebeck coefficient has a substantial increase and a maximum of about 220 μV/K at around 80 K has been found for x=0.08. These promising effects lead to a significant enhancement in the thermoelectric performance characterized by the figure-of-merit, ZT. A room-temperature ZT value of approximately 0.4 is thus achieved for Sr 0.92 Y0.08 Si2, about one order of magnitude larger than that of stoichiometric SrSi2.

AB - We report the results of the Y substitution in Sr1-xY xSi2 with x≤0.15 via measuring the temperature- dependent electrical resistivity, thermal conductivity, as well as Seebeck coefficient. Upon substituting Y onto the Sr sites, the electrical resistivity exhibit semiconducting behavior and the room-temperature electrical resistivity tends to reduce for x≤0.08. The thermal conductivity also decreases with increasing the Y content. Moreover, the Seebeck coefficient has a substantial increase and a maximum of about 220 μV/K at around 80 K has been found for x=0.08. These promising effects lead to a significant enhancement in the thermoelectric performance characterized by the figure-of-merit, ZT. A room-temperature ZT value of approximately 0.4 is thus achieved for Sr 0.92 Y0.08 Si2, about one order of magnitude larger than that of stoichiometric SrSi2.

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Enhancement in the thermoelectric performance by y substitution on SrSi₂

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