Thermoelectric properties of Sr–Ir–O compounds prepared by spark plasma sintering

Keawprak, Nittaya; Tu, Rong; Goto, Takashi

doi:10.1016/j.jallcom.2009.10.219

Cited by 13 publications

(13 citation statements)

References 14 publications

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“…which in the thermally activated transport model (ρ ~ exp[Δ /(2T)] ) straightforwardly provides 7 the thermal activation energy scale (Δ) for conduction without any fitting. The raw data (inset in Fig.…”

Section: (A)mentioning

confidence: 99%

Epitaxy-distorted spin-orbit Mott insulator in Sr2IrO4thin films

et al. 2013

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High quality epitaxial thin films of J eff =1/2 Mott insulator Sr 2 IrO 4 with increasing inplane tensile strain have been grown on top of SrTiO 3 (001) substrates. Increasing the inplane tensile strain up to ~0.3% was observed to drop the c/a tetragonality by 1.2 %. X-ray absorption spectroscopy detected a strong reduction of the linear dichroism upon increasing in-plane tensile strain towards a reduced anisotropy in the local electronic structure. While the most relaxed thin film shows a consistent dependence with previously reported single crystal bulk measurements, electrical transport reveals a charge gap reduction from 200 meV down to 50 meV for the thinnest and most epitaxy-distorted film.We argue that the reduced tetragonality plays a major role in the change of the electronic structure, which is reflected in the change of the transport properties. Our work opens the possibility for exploiting epitaxial strain as a tool for both structural and functional manipulation of spin-orbit Mott systems.

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Section: (A)mentioning

confidence: 99%

Epitaxy-distorted spin-orbit Mott insulator in Sr2IrO4thin films

et al. 2013

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“…4 Ωm, showing a little higher value than the literature [14,15], which is probably due to the coulomb-scattering mechanism on carrier at the boundary causing by the smaller grains (Fig. 6) [16].…”

Section: Resultsmentioning

confidence: 63%

“…Figure 6 presents the FESEM images of SrIrO 3 ceramic fracture surface sintered at 1000-1100 ℃ by SPS technique. The relative densities of SrIrO 3 ceramics sintered at 1000 ℃, 1050 ℃ and 1100 ℃ are 93.9%, 96.2% and 92.7%, respectively, which are much denser than the literature [14]. From the FESEM images, it could be seen that a dense structure forms and the average grain size is about 0.6-1.0 µm in length, indicating that the grain growth is slight in comparison with the grain size of the SrIrO 3 powders.…”

Section: Methodsmentioning

confidence: 67%

“…Spark plasma sintering (SPS) technique may consolidate alkaline-earth ruthenates or iridates bodies because the fast heating rate in SPS process may avoid the evaporation of volatile oxide species. Keawprak et al [14] reported the thermoelectric properties of Sr-Ir-O compounds by SPS technique at 1100 ℃, showing a 81.5% relative density of SrIrO 3 body, indicating the feasibility of SPS in alkaline-earth iridates compound sintering. However, the relative density of SrIrO 3 body still needs to be improved and the SPS process of SrIrO 3 ceramics also needs to be further studied.…”

Section: mentioning

confidence: 99%

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Synthetic process and spark plasma sintering of SrIrO3 composite oxide

Tian

Gong

et al. 2013

J Adv Ceram

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Single phase of SrIrO 3 powders and ceramics were obtained by solid-state chemical reaction method and spark plasma sintering (SPS) technique, respectively. Phase evolutions, characteristics, morphology and resistivity of the samples were studied by using thermogravimetric analysis-differential scanning calorimetry (TG-DSC), X-ray diffractometry (XRD), field emission scanning electron microscopy (FESEM) and four-point probe method, respectively. The results showed that the reaction process to form SrIrO 3 phase occurred between SrCO 3 and IrO 2 directly during the heating process. By using optimum fabrication conditions established from the TG-DSC results, single phase of SrIrO 3 powders was synthesized at 800-1000 ℃. SrIrO 3 ceramics were sintered by SPS technique at 1000-1100 ℃ with a pressure of 30 MPa, showing a high relative density of 92%-96% and dense microstructure. The room-temperature resistivity of SrIrO 3 ceramics was about 2×104 Ωm. The present study can provide high-quality ceramic target for the preparation of SrIrO 3 films in traditional physical vapor deposition (PVD) method.

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“…[8][9][10][11][12] Experimentally, SRO-based solid solutions have been synthesized with di↵erent alloying elements or vacancies and their thermoelectric properties have been characterized. 13 Theoretically, the thermoelectric properties of SrTiO 3 /SrRuO 3 superlattices have been studied 14 and a metallic non-censtrosymmetric ruthenate double-perovskite oxide SrCaRu 2 O 6 with large thermopower anisotropy has been proposed. 15 Although the electronic, structural, magnetic and lattice dynamical properties of bulk SRO have already been extensively explored theoretically, [16][17][18][19][20][21] to the best of our knowledge, the thermoelectric aspects has not been reported.…”

Section: Introductionmentioning

confidence: 99%

First-Principles Study of the Thermoelectric Properties of SrRuO₃

Miao

Bristowe

et al. 2016

J. Phys. Chem. C

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The Seebeck coe cient, thermoelectric power factor, electrical conductivity, and electronic thermal conductivity of the orthorhombic P bnm phase of SrRuO 3 are studied comprehensively by combining first-principles density functional calculations and Boltzmann transport theory. The influence of exchange-correlation functional on the Seebeck coe cient is carefully investigated. We show that the best agreement with experimental data is achieved when SrRuO 3 is described as being at the limit of a half-metal. Furthermore, we analyse the role of individual symmetry-adapted atomic distortions on the Seebeck coe cient, highlighting a particularly strong sensitivity to R + 4 oxygen rotational motions, which may shed light on how to manipulate the Seebeck coe cient. We confirm that the power factor of SrRuO 3 can only be slightly improved by carrier doping. Our results provide a complete understanding of the thermoelectric properties of SrRuO 3 and an interesting insight on the relationship between exchange-correlation functionals, atomic motions, and thermoelectric quantities.

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Thermoelectric properties of Sr–Ir–O compounds prepared by spark plasma sintering

Cited by 13 publications

References 14 publications

Epitaxy-distorted spin-orbit Mott insulator in Sr2IrO4thin films

Epitaxy-distorted spin-orbit Mott insulator in Sr2IrO4thin films

Synthetic process and spark plasma sintering of SrIrO3 composite oxide

First-Principles Study of the Thermoelectric Properties of SrRuO₃

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Thermoelectric properties of Sr–Ir–O compounds prepared by spark plasma sintering

Cited by 13 publications

References 14 publications

Epitaxy-distorted spin-orbit Mott insulator in Sr2IrO4thin films

Epitaxy-distorted spin-orbit Mott insulator in Sr2IrO4thin films

Synthetic process and spark plasma sintering of SrIrO3 composite oxide

First-Principles Study of the Thermoelectric Properties of SrRuO3

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First-Principles Study of the Thermoelectric Properties of SrRuO₃