High-temperature thermoelectric properties of the double-perovskite ruthenium oxide (Sr1−<i>x</i>La<i>x</i>)2ErRuO6

Takahashi, Ryohei; Okazaki, Renji; Yasui, Yukihiko; Terasaki, Ichiro; Sudayama, Takaaki; Nakao, Hironori; Yamasaki, Y.; Okamoto, Jun; Murakami, Youichi; Kitajima, Yoshinori

doi:10.1063/1.4757632

Cited by 20 publications

(18 citation statements)

References 31 publications

(29 reference statements)

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“…We infer that such an insulating behavior is ascribed not to the carrier concentration, which is essentially constant above room temperature, but to the mobility, as will also be discussed in the results of the Seebeck coefficient. Such a nonmetallic resistivity due to the mobility has also been observed in several oxide materials [34,35]. Figure 3(b) displays the temperature dependence of the in-plane Seebeck coefficient.…”

Section: Resultsmentioning

confidence: 77%

Thermoelectric transport in the layered Ca3Co4–xRhxO9 single crystals

Ikeda

Saito

Okazaki

2016

Journal of Applied Physics

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We have examined an isovalent Rh substitution effect on the transport properties of the thermoelectric oxide Ca 3 Co 4 O 9 using single-crystalline form. With increasing Rh content x, both the electrical resistivity and the Seebeck coefficient change systematically up to x = 0.6 for Ca 3 Co 4−x Rh x O 9 samples. In the Fermi-liquid regime where the resistivity behaves as ρ = ρ 0 + AT 2 around 120 K, the A value decreases with increasing Rh content, indicating that the correlation effect is weakened by Rh 4d electrons with extended orbitals. We find that, in contrast to such a weak correlation effect observed in the resistivity of Rh-substituted samples, the low-temperature Seebeck coefficient is increased with increasing Rh content, which is explained with a possible enhancement of a pseudogap associated with the short-range order of spin density wave. In high-temperature range above room temperature, we show that the resistivity is largely suppressed by Rh substitution while the Seebeck coefficient becomes almost temperature-independent, leading to a significant improvement of the power factor in Rh-substituted samples. This result is also discussed in terms of the differences in the orbital size and the associated spin state between Co 3d and Rh 4d electrons.

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Section: Resultsmentioning

confidence: 77%

Thermoelectric transport in the layered Ca3Co4–xRhxO9 single crystals

Ikeda

Saito

Okazaki

2016

Journal of Applied Physics

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“…Additionally, La was used as A-site dopant for (Sr 1−x La x ) 2 ErRuO 6 (0 < x < 0.3). The carrier concentration was enhanced from 9.7 × 10 20 to 2.2 × 10 21 cm −3 , when x changed from 0.1 to 0.3, resulting in the electrical conductivity increased from 0.1 to 1.7 S·cm −1 at 800 K. A ZT value of ~0.001 was obtained with S of −160 µV·K −1 and κ of 7 mW·cm −1 ·K −1 for (Sr 0.9 La 0.1 ) 2 ErRuO 6 at 800 K [155]. …”

Section: Oxide Perovskitesmentioning

confidence: 99%

Development of Perovskite-Type Materials for Thermoelectric Application

2018

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Oxide perovskite materials have a long history of being investigated for thermoelectric applications. Compared to the state-of-the-art tin and lead chalcogenides, these perovskite compounds have advantages of low toxicity, eco-friendliness, and high elemental abundance. However, because of low electrical conductivity and high thermal conductivity, the total thermoelectric performance of oxide perovskites is relatively poor. Variety of methods were used to enhance the TE properties of oxide perovskite materials, such as doping, inducing oxygen vacancy, embedding crystal imperfection, and so on. Recently, hybrid perovskite materials started to draw attention for thermoelectric application. Due to the low thermal conductivity and high Seebeck coefficient feature of hybrid perovskites materials, they can be promising thermoelectric materials and hold the potential for the application of wearable energy generators and cooling devices. This mini-review will build a bridge between oxide perovskites and burgeoning hybrid halide perovskites in the research of thermoelectric properties with an aim to further enhance the relevant performance of perovskite-type materials.

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“…[28], the crystal symmetry imposes a strong constraint on the ratio of A-O and B-O bond lengths in an ideal perovskite structure ABO 3 …”

Section: Resultsmentioning

confidence: 99%

“…In the past few years, many studies have been carried out on tuning and optimizing the magnetic properties of Sr 2 FeMoO 6 double perovskite by doping at Sr sub-lattice with trivalent rare earth ions [3,[14][15][16][17][18]. The magnetic properties of La-, Ce-, Pr-, Nd-, Smand Eu-doped Sr 2 FeMoO 6 had been investigated in our previous work as well [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…The phenomenon of marvelous magnetoresistance (MR) at room temperature in ordered double perovskite compound A 2 BB 0 O 6 , where A is an alkaline-earth element, B and B 0 are transition metal elements, opens new opportunities for novel device applications such as magnetic recording or high-efficiency magnetic sensors [1][2][3][4][5][6]. A 2 BB 0 O 6 compound is virtually a duplication of the simple perovskite unit cell ABO 3 , where cation A occupies the cube vertices, while B and B 0 cations sit alternately at the center of the oxygen octahedron.…”

Section: Introductionmentioning

confidence: 99%

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