Thermoelectric properties of Ca1−xSrxRuO3 compounds prepared by spark plasma sintering

Keawprak, Nittaya; Tu, Rong; Goto, Takashi

doi:10.1016/j.jallcom.2012.01.150

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…The Ca 0.90 Sr 0.10 RuO 3 compound show a metallic behavior and short-range ferromagnetic interactions appear. This indicates that the ferromagnetism has been suppressed through the process of substitution of Sr 2+ ions by Ca 2+ ions [10][11][12][13][14]. For the compounds with large Ca 2+ ions doping (x ≥ 0.7), no clear phase transition is discerned, and only some irreversibility is observed in the magnetization curves of these materials.…”

Section: Resultsmentioning

confidence: 99%

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Preparation, characterization and temperature-dependent photoluminescence in Ca0.90Sr0.10RuO3 compound

Quiroz

Abatal

Chavira³

et al. 2018

Rev. Mex. Fís.

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We report the Ca0.90Sr0.10RuO3 compound synthesized by solid-state reaction method at ambient pressure using temperatures between 700 and 800◦C in air. By X-ray powder diffraction (XRD), we determine a solid solution until Ca0.85Sr0.15RuO3 compound. Scanning electron microscopy (SEM) indicates than the particle size varies between 0.422 and 1.598 µm. The resistance measurement, as a function of temperature measurement from 10 to 300 K for Ca0.90Sr0.10RuO3 compound shows a metallic behavior. Finally, photoluminescence (PL) and its temperature dependence of Ca0.90Sr0.10RuO3 compound in the temperature range 6.7-296 K were measured. It was observed than the main broad band centered at ∼ 1.73 eV with the shoulders at ∼ 1.38 eV and ∼ 2.05 eV exists in the entire temperature range. It can be well fitted by three Gaussian curves B1, B2 and B3, centered at ∼ 1.38, ∼ 1.73 and ∼ 2.05 eV, respectively. The transitions identified as B1 and B2 are studied with temperature. The photoluminescence mechanics for Ca0.90Sr0.10RuO3 compound are presented based on the electronic structures formed by the interactions among spin, charge and lattice, in which B1 was identified with the charge transfer excitation of an electron from the lower Jahn-Teller split eg level of a Ru3+ ion to the eg level of an adjacent Ru4+ ion, B2 was assigned to the transition between the spin up and spin down eg bands separated by Hund’s coupling energy Ej , whereas B3 is attributed to the transition, determined by the crystal field energy Ec between a t2g core electron of Ru3+ to the spin up eg bands of Ru4+ by a dipole allowed charge transfer rocess.

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Section: Resultsmentioning

confidence: 99%

“…shows the XRD patterns of the (Ca 1−x Sr x )RuO 3 system with x = 0.07, 0.10, and 0.15[10][11][12]. From those spectra, compounds show a solubility up to x = 0.15.…”

mentioning

confidence: 99%

Preparation, characterization and temperature-dependent photoluminescence in Ca0.90Sr0.10RuO3 compound

Quiroz

Abatal

Chavira³

et al. 2018

Rev. Mex. Fís.

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“…The Pbnm ground state of SRO is a conductive metallic oxide that is widely used as an electrode material in oxide heterostructures and superlattices, ,, owing to its reasonably good conducting properties , and its structural compatibility with other perovskite oxides. In some recent studies, SRO and related compounds were also revealed as interesting candidates for thermoelectric applications. − Experimentally, SRO-based solid solutions have been synthesized with different alloying elements or vacancies, and their thermoelectric properties have been characterized . Theoretically, the thermoelectric properties of SrTiO 3 /SrRuO 3 superlattices have been studied, and a metallic noncenstrosymmetric ruthenate double-perovskite oxide SrCaRu 2 O 6 with large thermopower anisotropy has been proposed .…”

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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Designing a robustly metallic noncenstrosymmetric ruthenate oxide with large thermopower anisotropy

2014

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The existence of B30 noncentrosymmetric metals (NCSM) suggests a contraindication between crystal structures without inversion symmetry and metallic behaviour. Those containing oxygen are especially scarce. Here we propose and demonstrate a design framework to remedy this property disparity and accelerate NCSM oxide discovery. The primary ingredient relies on the removal of inversion symmetry through displacements of atoms whose electronic degrees of freedom are decoupled from the states at the Fermi level. Density functional theory calculations validate this crystal-chemistry strategy, and we predict a new polar ruthenate exhibiting robust metallicity. We demonstrate that the electronic structure is unaffected by the inclusion of spin-orbit interactions, and that cation-ordered SrCaRu 2 O 6 exhibits a large thermopower anisotropy (|DS > |B6.3 mV K À 1 at 300 K) derived from its polar structure. Our findings provide chemical and structural selection guidelines to aid in the search of NCSM with enhanced thermopower anisotropy.

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Thermoelectric properties of Ca1−xSrxRuO3 compounds prepared by spark plasma sintering

Cited by 3 publications

References 27 publications

Preparation, characterization and temperature-dependent photoluminescence in Ca0.90Sr0.10RuO3 compound

Preparation, characterization and temperature-dependent photoluminescence in Ca0.90Sr0.10RuO3 compound

First-Principles Study of the Thermoelectric Properties of SrRuO₃

Designing a robustly metallic noncenstrosymmetric ruthenate oxide with large thermopower anisotropy

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Thermoelectric properties of Ca1−xSrxRuO3 compounds prepared by spark plasma sintering

Cited by 3 publications

References 27 publications

Preparation, characterization and temperature-dependent photoluminescence in Ca0.90Sr0.10RuO3 compound

Preparation, characterization and temperature-dependent photoluminescence in Ca0.90Sr0.10RuO3 compound

First-Principles Study of the Thermoelectric Properties of SrRuO3

Designing a robustly metallic noncenstrosymmetric ruthenate oxide with large thermopower anisotropy

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Product

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First-Principles Study of the Thermoelectric Properties of SrRuO₃