Thermoelectric properties of double-perovskite oxide Sr&lt;sub&gt;2-&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;&lt;i&gt;M&lt;/i&gt;&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;FeMoO&lt;sub&gt;6&lt;/sub&gt; (&lt;i&gt;M&lt;/i&gt; = Ba, La)

Sugahara, Tohru; Ohtaki, Michitaka; Souma, Takeshi

doi:10.2109/jcersj2.116.1278

Cited by 51 publications

(8 citation statements)

References 32 publications

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“…36,37 To achieve ZT= 1 at 1000 K, a material with this thermal conductivity would require ln 0 = 12.4 or PF max =10 −3 W / mK 2 . Note that must be in siemens per meter for this equation to be valid.…”

Section: A Jonker and Ioffe Analysismentioning

confidence: 99%

Electronic and thermoelectric analysis of phases in the In2O3(ZnO)k system

Hopper

Zhu

Song

et al. 2011

Journal of Applied Physics

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The high-temperature electrical conductivity and thermopower of several compounds in the In2O3(ZnO)k system (k=3, 5, 7, and 9) were measured, and the band structures of the k=1, 2, and 3 structures were predicted based on first-principles calculations. These phases exhibit highly dispersed conduction bands consistent with transparent conducting oxide behavior. Jonker plots (Seebeck coefficient versus natural logarithm of conductivity) were used to obtain the product of the density of states and mobility for these phases, which were related to the maximum achievable power factor (thermopower squared times conductivity) for each phase by Ioffe analysis (maximum power factor versus Jonker plot intercept). With the exception of the k=9 phase, all other phases were found to have maximum predicted power factors comparable to other thermoelectric oxides if suitably doped.

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Section: A Jonker and Ioffe Analysismentioning

confidence: 99%

Electronic and thermoelectric analysis of phases in the In2O3(ZnO)k system

Hopper

Zhu

Song

et al. 2011

Journal of Applied Physics

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“…We suggest that the double perovskite structure of A 2 BB ′ O 6 may be a key ingredient; Aguirre et al 11 found characteristic micro-domain structures in the transmission electron microscope. Ohtaki et al 29 reported that the double perovskite oxide Sr 2 FeMoO 6 also shows a low thermal conductivity. In spite of such low thermal conductivity, the dimensionless figure of merit (ZT = S 2 σT /κ) of the present ruthenate remains low (ZT ∼ 10 −3 at 800 K) because of the high resistivity.…”

mentioning

confidence: 99%

High-temperature thermoelectric properties of the double-perovskite ruthenium oxide (Sr1−xLax)2ErRuO6

Takahashi

Okazaki

Yasui

et al. 2012

Journal of Applied Physics

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We have prepared polycrystalline samples of (Sr1−xLax)2ErRuO6 and (Sr1−xLax)2YRuO6, and have measured the resistivity, Seebeck coefficient, thermal conductivity, susceptibility and x-ray absorption in order to evaluate the electronic states and thermoelectric properties of the doped double-perovskite ruthenates. We have observed a large Seebeck coefficient of −160 µV/K and a low thermal conductivity of 7 mW/cmK for x=0.1 at 800 K in air. These two values are suitable for efficient oxide thermoelectrics, although the resistivity is still as high as 1 Ωcm. From the susceptibility and x-ray absorption measurements, we find that the doped electrons exist as Ru 4+in the low spin state. On the basis of the measured results, the electronic states and the conduction mechanism are discussed.

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“…22 In terms of thermoelectric performance, Sr 2 FeMoO 6 is characterised by a low S = −50 μV K −1 at 1073 K. However, this can be increased by partial replacement of Sr by Ba (S 1073 K = −125 μV K −1 ), leading to S 2 /ρ values of 0.08 mW m −1 K −2 (ref. 23). Measurements of the thermal conductivity showed a 1/T dependence characteristic of a crystalline solid but with a very low κ = 0.2 W m −1 K −1 at 1073 K, which resulted in ZT = 0.3 at 1073 K. This compares to κ = 6 W m −1 K −1 at high temperatures for SrTiO 3 with only Ti 4+ as a B-site cation.…”

Section: Introductionmentioning

confidence: 89%

“…Similar transitions were observed in the earlier report on the Sr 2−x Ba x FeMoO 6 series. 23 The origin of these anomalies is not clear but it is worth noting the absence of any transitions in S(T ), suggesting that these may be due to extrinsic factors. The y = 0.04 and 0.08 samples contain signatures of these anomalies but for y = 0.13 and 0.20 smoothly varying metallic varying ρ(T ) were observed.…”

Section: Thermoelectric Propertiesmentioning

confidence: 99%

Antisite-disorder, magnetic and thermoelectric properties of Mo-rich Sr₂Fe_1−yMo_1+yO₆ (0 ≤ y ≤ 0.2) double perovskites

et al. 2015

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Structure analysis using X-ray and neutron powder diffraction and elemental mapping has been used to demonstrate that nominal A-site deficient Sr(2-x)FeMoO(6-δ) (0 ≤x≤ 0.5) compositions form as Mo-rich Sr(2)Fe(1-y)Mo(1+y)O(6) (0 ≤y≤ 0.2) perovskites at high temperatures and under reducing atmospheres. These materials show a gradual transition from the Fe and Mo rock salt ordered double perovskite structure to a B-site disordered arrangement. Analysis of the fractions of B-O-B' linkages revealed a gradual increase in the number of Mo-O-Mo linkages at the expense of the ferrimagnetic (FIM) Fe-O-Mo linkages that dominate the y = 0 material. All samples contain about 10-15% antiferromagnetic (AF) Fe-O-Fe linkages, independent of the degree of B-site ordering. The magnetic susceptibility of the y = 0.2 sample is characteristic of a small domain ferrimagnet (T(c)∼ 250 K), while room temperature neutron powder diffraction demonstrated the presence of G-type AF ordering linked to the Fe-O-Fe linkages (m(Fe) = 1.25(7)μ(B)). The high temperature thermoelectric properties are characteristic of a metal with a linear temperature dependence of the Seebeck coefficient, S (for all y) and electrical resistivity ρ (y≥ 0.1). The largest thermoelectric power factor S(2)/ρ = 0.12 mW m(-1) K(-1) is observed for Sr(2)FeMoO(6) at 1000 K.

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Thermoelectric properties of double-perovskite oxide Sr<sub>2-<i>x</i></sub><i>M</i><sub><i>x</i></sub>FeMoO<sub>6</sub> (<i>M</i> = Ba, La)

Cited by 51 publications

References 32 publications

Electronic and thermoelectric analysis of phases in the In2O3(ZnO)k system

Electronic and thermoelectric analysis of phases in the In2O3(ZnO)k system

High-temperature thermoelectric properties of the double-perovskite ruthenium oxide (Sr1−xLax)2ErRuO6

Antisite-disorder, magnetic and thermoelectric properties of Mo-rich Sr₂Fe_1−yMo_1+yO₆ (0 ≤ y ≤ 0.2) double perovskites

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Thermoelectric properties of double-perovskite oxide Sr<sub>2-<i>x</i></sub><i>M</i><sub><i>x</i></sub>FeMoO<sub>6</sub> (<i>M</i> = Ba, La)

Cited by 51 publications

References 32 publications

Electronic and thermoelectric analysis of phases in the In2O3(ZnO)k system

Electronic and thermoelectric analysis of phases in the In2O3(ZnO)k system

High-temperature thermoelectric properties of the double-perovskite ruthenium oxide (Sr1−xLax)2ErRuO6

Antisite-disorder, magnetic and thermoelectric properties of Mo-rich Sr2Fe1−yMo1+yO6 (0 ≤ y ≤ 0.2) double perovskites

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Antisite-disorder, magnetic and thermoelectric properties of Mo-rich Sr₂Fe_1−yMo_1+yO₆ (0 ≤ y ≤ 0.2) double perovskites