Ferroelectric-thermoelectricity and Mott transition of ferroelectric oxides with high electronic conductivity

Lee, Soonil; Bock, Jonathan A.; Trolier-McKinstry, Susan; Randall, Clive A.

doi:10.1016/j.jeurceramsoc.2012.06.007

Cited by 103 publications

(84 citation statements)

References 136 publications

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“…intergrowths had a (100) 5 jj (100) 4 epitaxy and were distributed homogeneously throughout the ceramic. 31 Some of the intergrowths terminated or moved to a different plane of the La 2 Ti 2 O 7 as shown in Figure 2(d). When an intergrowth terminated, it disturbed the neighbouring planes as seen in Figures 2(c) and 2(d).…”

Section: Resultsmentioning

confidence: 93%

Reduced thermal conductivity by nanoscale intergrowths in perovskite like layered structure La2Ti2O7

Khaliq

Chen

et al. 2015

Journal of Applied Physics

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The effect of substitution and oxidation-reduction on the thermal conductivity of perovskite-like layered structure (PLS) ceramics was investigated in relation to mass contrast and non-stoichiometry. Sr (acceptor) was substituted on the A site, while Ta (donor) was substituted on the B site of La 2 Ti 2 O 7 . Substitution in PLS materials creates atomic scale disorders to accommodate the non-stoichiometry. High resolution transmission electron microscopy and X ray diffraction revealed that acceptor substitution in La 2 Ti 2 O 7 produced nanoscale intergrowths of n ¼ 5 layered phase, while donor substitution produced nanoscale intergrowths of n ¼ 3 layered phase. As a result of these nanoscale intergrowths, the thermal conductivity value reduced by as much as $20%. Pure La 2 Ti 2 O 7 has a thermal conductivity value of $1.3 W/m K which dropped to a value of $1.12 W/m K for Sr doped La 2 Ti 2 O 7 and $0.93 W/m K for Ta doped La 2 Ti 2 O 7 at 573 K. V C 2015 AIP Publishing LLC.

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Section: Resultsmentioning

confidence: 93%

Reduced thermal conductivity by nanoscale intergrowths in perovskite like layered structure La2Ti2O7

Khaliq

Chen

et al. 2015

Journal of Applied Physics

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“…Owing to the orthorhombicity in (Sr,Ca)Ru 2 O 6 , the recent interest in thermoelectric properties of perovskite oxide superlattices 40 , and the fact that degenerately doped ferroelectrics with polar axes exhibit unusual thermoelectric properties [41][42][43] , we evaluate the thermopower anisotropy at 300 K using Botlzmann transport theory within the constant scattering time approximation. Figure 5 shows the relevant thermoelectric properties in the chemical potential range varying from À 0.25 to 0.25 eV.…”

Section: Resultsmentioning

confidence: 99%

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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“…Besides SrTiO 3 , other oxide materials such as doped SrNb 2 O 6 , 34,57,58 and Ba 1Àx Sr x PbO 3 59,60 that are being explored for potential high temperature applications.…”

Section: àmentioning

confidence: 99%

“…[27][28][29][30][31][32][33][34] Despite growing interest in thin film oxide thermoelectrics, as far as I am aware of, only one study surveys thermoelectric studies on thin films materials in depth, but was limited to two materials systems namely ZnO and Ca 3 Co 4 O 9 . 35 The aim of this review is to bridge the gap in earlier reviews on studies related to low dimensional thermoelectric oxide materials and also, place an emphasis on discussing the physics behind achieving large thermoelectric figure of merit in these materials.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric and thermal transport properties of complex oxide thin films, heterostructures and superlattices

Ravichandran

2016

J. Mater. Res.

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Over the years, the search for high performance thermoelectric materials has been dictated by the "phonon glass and electron crystal (PGEC)" paradigm, which suggests that low band gap semiconductors with high atomic number elements and high carrier mobility are the ideal materials to achieve high thermoelectric figure of merit. Complex oxides provide alternative mechanisms such as large density of states and strong electron correlation for high thermoelectric efficiency, albeit having low carrier mobility. Due to vast structural and chemical flexibility, they provide a fertile playground to design high efficiency thermoelectric materials. Further, developments in oxide thin film growth methods have enabled synthesis of high quality, atomically precise low dimensional structures such as heterostructures and superlattices. These materials and structures act as excellent model systems to explore nanoscale thermal and thermoelectric transport, which will not only expand the frontier of our knowledge, but also continue to enable cutting edge applications.

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Ferroelectric-thermoelectricity and Mott transition of ferroelectric oxides with high electronic conductivity

Cited by 103 publications

References 136 publications

Reduced thermal conductivity by nanoscale intergrowths in perovskite like layered structure La2Ti2O7

Reduced thermal conductivity by nanoscale intergrowths in perovskite like layered structure La2Ti2O7

Designing a robustly metallic noncenstrosymmetric ruthenate oxide with large thermopower anisotropy

Thermoelectric and thermal transport properties of complex oxide thin films, heterostructures and superlattices

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