Thermoelectric properties of hot-pressed β-FeSi2 with yttria dispersion by mechanical alloying

Ito, Mikio; Tada, Tomoyuki; Hara, Shigeta

doi:10.1016/j.jallcom.2005.04.060

Cited by 27 publications

(23 citation statements)

References 8 publications

(9 reference statements)

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“…[2,3]. This Z value is almost as same as that of β-FeSi 2 , which is a candidate for new thermoelectric material as non-oxide material [4]. Terasaki et al reported that the Z value of Na x CoO 2 is ca.…”

Section: Introductionmentioning

confidence: 65%

Thermoelectric properties of Sn1−x−yTiySbxO2 ceramics

Tsubota

Ohno

Shiraishi

et al. 2008

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 65%

Thermoelectric properties of Sn1−x−yTiySbxO2 ceramics

Tsubota

Ohno

Shiraishi

et al. 2008

Journal of Alloys and Compounds

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“…Hasaka et al 10) reported the effects of the addition of a metal (Ag or Cu) to -FeSi 2 and discussed the figure of merit at 300 K. The compound (Fe 0:97 Co 0:03 Si x ) 100ÀyÀz Ag y Cu z did not show any marked improvement in performance, and its ZT value at 300 K was about 0.025. Our Sm 2 O 3 -containing sample showed a ZT value of 0.087 at the same temperature, although the silicide should be evaluated at a higher temperatures of 600 K. Ito et al 6) added Y 2 O 3 to -FeSi 2 and this system's figure of merit was 0:1 Â 10 À3 , whereas that of our system was 0:49 Â 10 À3 at 600 K. One reason for the increase in the figure of merit is the lower thermal conductivity of the added oxide itself; the thermal conductivities of Sm 2 O 3 and Y 2 O 3 are 1.36 and 2.65 W m À1 K À1 , respectively.…”

Section: Figure Of Merit (Thermoelectric Performance)mentioning

confidence: 56%

“…In previous studies, oxides of trivalent metals, such as La 2 O 3 and Y 2 O 3 , and tetravalent metals, such as TiO 2 and LaSrMnO 3 (LSMO) have been added to n-type FeSi 2 to improve its performance. [3][4][5] Ito et al developed a process that uses mechanical alloying, 6) but they did not succeed in achieving any improvement, reporting a figure of merit of only 0:1 Â 10 À3 . Our goal was to improve thermoelectric properties of n-type doped samples of FeSi 2 , such as (Fe 0:95 Co 0:05 )Si 2 .…”

Section: Introductionmentioning

confidence: 99%

Improved Thermoelectric Performances of Oxide-Containing FeSi<SUB>2</SUB>

Sugihara

Morikawa²

2011

Mater. Trans.

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Because of its chemical stability and low cost, iron silicide is a promising thermoelectric material for use at high temperatures. Its performance, however, is poor compared with that of BiTe, PbTe, or SiGe, which are popular thermoelectric materials. We produced n-type FeSi 2 samples containing various oxides, which showed a good thermoelectric performance. We attempted to unify the parameters attributing to thermoelectric performance, and the electrical resistivity decreased while an adequate Seebeck coefficient was retained and the thermal conductivity was reduced. This results in a greater value of the Seebeck coefficient, particularly on addition of Sm 2 O 3 ; the resulting figure of merit ZT was 0.56 at 868 K. Addition of Er 2 O 3 gave a ZT value of 0.54 at 877 K, and the material showed a lower thermal conductivity of 2-2.5 W/mÁK.

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“…Thus, much effort has been expended, including in materials development, to improve the TE conversion efficiency. Various interesting TE materials have been reported to date such as tellurides, (1,2) silicon germanium, (3) silicides, (4,5) zinc antimonides, (6) skutterudites, (7) clathrates, (8) half-Heusler alloys, (9) nanostructured materials, (10,11) and oxides. (12) This last group of materials has been extensively investigated after the discovery of the good TE properties of the layered cobalt oxide Na x CoO 2 (13) because of their high thermal and chemical stabilities at high temperatures in air.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of SnO2 Ceramics Codoped with Sb and Zn Prepared by Reactive Spark Plasma Synthesis Followed by Thermal Treatment

2015

Sensors and Materials

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The thermoelectric (TE) properties of SnO 2 codoped with Sb and Zn were investigated. Polycrystalline ceramics of n-type SnO 2 -based semiconductors (Sn 1−2x Sb x Zn x O 2 , x = 0, 0.01, 0.03, 0.05, 0.07) were prepared by reactive spark plasma synthesis followed by thermal treatment at a temperature of 1123 K. X-ray diffraction (XRD) analysis showed that most of the XRD peaks could be assigned to peaks of the pure SnO 2 phase. The x = 0.05 and 0.07 samples showed the formation of a Zn 2 SnO 4 secondary phase along with the main SnO 2 phase. Microstructural analysis by scanning electron microscopy showed that the average grain sizes of the Sb and Zn codoped samples were larger than that of the undoped sample. The highest TE power factor in this study was 1.20 × 10 −4 Wm −1 K −2 , which was comparable to the previously reported value for the sample synthesized by conventional normal pressure sintering at 1573 K. The synthesis method we describe here is very effective for the low-temperature synthesis of SnO 2 -based TE ceramics.

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Thermoelectric properties of hot-pressed β-FeSi2 with yttria dispersion by mechanical alloying

Cited by 27 publications

References 8 publications

Thermoelectric properties of Sn1−x−yTiySbxO2 ceramics

Thermoelectric properties of Sn1−x−yTiySbxO2 ceramics

Improved Thermoelectric Performances of Oxide-Containing FeSi<SUB>2</SUB>

Thermoelectric Properties of SnO2 Ceramics Codoped with Sb and Zn Prepared by Reactive Spark Plasma Synthesis Followed by Thermal Treatment

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