Thermoelectricity of CaIrO3 ceramics prepared by spark plasma sintering

Keawprak, Nittaya; Tu, Rong; Goto, Takashi

doi:10.2109/jcersj2.117.466

Cited by 10 publications

(6 citation statements)

References 6 publications

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“…In addition to the interest in fundamental physics, the CaIrO 3 ceramics have also been investigated by Keawprak et al [40] for the potential thermoelectric applications. They prepared both phases of CaIrO 3 with spark plasma sintering technique and evaluated their thermoelectric properties from room temperature up to 1023 K. The highest dimensionless figure of merit (ZT) reaches 0.02 and 0.003 for Pv and pPv phase, respectively.…”

Section: Ppv Versus Pv Camo 3 (M = Ir Rh Ru)mentioning

confidence: 99%

Synthesis, Crystal Structure, and Physical Properties of the Perovskite Iridates

Cai¹,

Li²,

Cheng³

2016

Perovskite Materials - Synthesis, Characterisation, Properties, and Applications

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Perovskite iridates have emerged as a new paradigm for studying the strongly correlated electron physics with strong spin-orbit coupling. The "113" alkaline-earth iridates AIrO 3 (A = Ca, Sr, Ba) display a rich variety of crystallographic and electronic states and are now attracting growing research interest. This chapter aims to provide an overview for these "113" iridates, including the materials' synthesis, crystal structure, major physical properties, and other interesting results such as the effects of pressure and chemical substitutions, as well as theoretical perspectives.

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Section: Ppv Versus Pv Camo 3 (M = Ir Rh Ru)mentioning

confidence: 99%

Synthesis, Crystal Structure, and Physical Properties of the Perovskite Iridates

Cai¹,

Li²,

Cheng³

2016

Perovskite Materials - Synthesis, Characterisation, Properties, and Applications

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“…However, it was more convenient for mutual comparison to use pseudo-cubic and cubic lattice parameters with subscript "c." The pseudo-cubic (a c ) lattice parameter was converted from the orthorhombic lattice parameters ( ffiffi ffi 2 p Â ffiffi ffi 2 p Â 2Þ of bulk Pv-CaIrO 3 and we calculated a c $ 3.86 Å . 23,24 If one takes this value literally, it matches the NdGaO 3 substrate (a c $ 3.86 Å ) and corresponds to þ3.76% and þ1.85% compressive strains for the films grown on the YAlO 3 (a c $ 3.72 Å ), LaAlO 3 substrates (a c $ 3.78 Å ); À1.15% and À2.52% tensile strains for the films grown on the SrTiO 3 (a c $ 3.905 Å ), and GdScO 3 substrates (a c $ 3.96 Å ), respectively. The in-plane lattice parameter of the substrate was in relationship to that of Pv-CaIrO 3 (Fig.…”

Section: Resultsmentioning

confidence: 99%

Persistent semi-metal-like nature of epitaxial perovskite CaIrO3 thin films

Biswas

Jeong

2015

Journal of Applied Physics

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Strong spin-orbit coupled 5d transition metal based ABO 3 oxides, especially iridates, allow tuning parameters in the phase diagram and may demonstrate important functionalities, for example, by means of strain effects and symmetry-breaking, because of the interplay between the Coulomb interactions and strong spin-orbit coupling. Here, we have epitaxially stabilized high quality thin films of perovskite (Pv) CaIrO 3 . Film on the best lattice-matched substrate shows semi-metal-like characteristics. Intriguingly, imposing tensile or compressive strain on the film by altering the underlying lattice-mismatched substrates still maintains semi-metallicity with minute modification of the effective correlation as tensile (compressive) strain results in tiny increases (decreases) of the electronic bandwidth. In addition, magnetoresistance remains positive with a quadratic field dependence. This persistent semi-metal-like nature of Pv-CaIrO 3 thin films with minute changes in the effective correlation by strain may provide new wisdom into strong spin-orbit coupled 5d based oxide physics. V C 2015 AIP Publishing LLC. [http://dx.

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“…Though J.G. Cheng [6,12], indicating the feasibility of the application of SPS in alkaline-earth iridates compounds sintering. Thus, BaIrO 3 bulks could be sintered by suppressing the volatile nature of iridium oxide with SPS technique.…”

Section: Introductionmentioning

confidence: 99%

Study on the densification of BaIrO3 bulks by spark plasma sintering and its films deposition

Tian

Gong

et al. 2014

J Electroceram

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Single phase of BaIrO 3 powders, dense bulks, and thin films were prepared by re-calcination method, spark plasma sintering (SPS) technique, and pulsed laser deposition (PLD) technique, respectively. The phase evolutions, crystallinity, microstructure and electrical properties of samples were investigated. BaIrO 3 powders obeyed normal distribution with D AV =1.68 μm; BaIrO 3 bulks were densified by SPS technique at 950-1050°C under a pressure of 30 MPa, showing a dense microstructure and the highest relative density of about 96.8 %. The room temperature bulks resistance and carrier mobility were about 3×10 −4 Ω m and 4×10 −2 m 2 V −1 s −1 , respectively. Besides, BaIrO 3 thin films with a slightly Ir deficiency were successfully prepared on Si(111) substrates at a deposition temperature of 200-400°C by PLD technique, which was accompanied by the formation of Ir-rich composition on the surface of the laser-ablated polycrystalline BaIrO 3 target. The reason for the Ir deficiency of BaIrO 3 films was explained in this study.

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Thermoelectricity of CaIrO3 ceramics prepared by spark plasma sintering

Cited by 10 publications

References 6 publications

Synthesis, Crystal Structure, and Physical Properties of the Perovskite Iridates

Synthesis, Crystal Structure, and Physical Properties of the Perovskite Iridates

Persistent semi-metal-like nature of epitaxial perovskite CaIrO3 thin films

Study on the densification of BaIrO3 bulks by spark plasma sintering and its films deposition

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