Modulated Structure of Misfit-Layered Cobalt Oxide [Ca2(Co0.65Cu0.35)2O4]0.63CoO2

Miyazaki, Yasumitsu; Miura, Tatsuro; Onoda, Mitsuko; Uchida, Masaya; Ishii, Yoshinobu; Ono, Yasuhiro; Morii, Yukio; Kajitani, Tsuyoshi

doi:10.1143/jjap.42.7467

Cited by 30 publications

(20 citation statements)

References 4 publications

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“…This strong M(u ¼ 1)-O2(u ¼ 2) bond is also found in the Sr-Bi cobaltite, where it is enhanced by the weak BiO-BiO intrasubsystem interaction within the four atoms thick rock salt-type layer [3]. Apart from this oxide, in other cobaltites, despite being shorter when compared to sulphides, the shortest intrasubsystem distance alternates from shorter to longer than the intrasubsystem interaction along t [29,30,38,39]. However, in this Sr-Cr misfit oxide, both shortest distances become shorter for the same t Regarding the modulation in the distances of the RS-type layer of the Sr-Cr misfit, the largest difference between the maxima and minimum Sr-O1 distance for the same bond is that observed for O1 1 30,40].…”

Section: Article In Pressmentioning

confidence: 71%

Structure and microstructure of the high pressure synthesised misfit layer compound [Sr2O2][CrO2]1.85

Castillo‐Martínez¹,

Schönleber²,

Smaalen³

et al. 2008

Journal of Solid State Chemistry

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a b s t r a c tThe strontium chromium oxide [Sr 2 O 2 ][CrO 2 ] 1.85 misfit layer compound has been synthesised at highpressure and high-temperature conditions. Electron diffraction patterns and high-resolution transmission electron microscopy images along [001] show the misfit character of the different layers composing the structure with a supercell along the incommensurate parameter bE7b 1 E13b 2 . The modulated crystal structure has been refined within the superspace formalism against single-crystal X-ray diffraction data, employing the (3+1)-dimensional superspace group C 0 nmb(0s 2 0)0 0 s. The compound has a composite structure with lattice parameters a 1 ¼ 5.182(1) Å , b 1 ¼ 5.411(1) Å , c 1 ¼ 18.194(3) Å for the first, SrO, subsystem and the same a and c, but with b 2 ¼ 2.925(1) Å for the second, CrO 2 , subsystem. The layer stacking is similar to that of orthorhombic PbS(TiS 2 ) 1.18 , but with a much stronger intersubsytem bonding in the case of the oxide. The intersubsystem lattice mismatch is mainly handled by displacement modulations of the Sr atoms, correlated with modulations of the valence, the coordination and the anisotropic displacement parameters.

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Section: Article In Pressmentioning

confidence: 71%

Structure and microstructure of the high pressure synthesised misfit layer compound [Sr2O2][CrO2]1.85

Castillo‐Martínez¹,

Schönleber²,

Smaalen³

et al. 2008

Journal of Solid State Chemistry

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“…A second route to improve ZT values is cationic substitutions. Most studied in this field are replacements of calcium by heavier atoms such as strontium, 48,49 bismuth, 50,51 rare earth elements, 52,53 or yttrium. 45 Finally, the best ZT ever reported for a polycrystalline Ca 3 Co 4 O 9 sample has been obtained by Ag-substituted and doped samples Ca 2.7 Ag 0.3-Co 4 O 9 /Ag-10 wt%, which exhibit a ZT value of 0.5 at 1000 K. 54 However, the thermal conductivity of these doped misfit layered compounds must be carefully studied.…”

Section: Promising P-type Materialsmentioning

confidence: 99%

Thermoelectric Ceramics for Energy Harvesting

et al. 2012

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Metal oxides (Ca3Co4O9, CaMnO3, SrTiO3, In2O3), Ti sulfides, and Mn silicides are promising thermoelectric (TE) material candidates for cascade‐type modules that are usable in a temperature range of 300–1200 K in air. In this paper, we review previous studies in the field of TE materials development and make recommendations for each material regarding future research. Furthermore, the R&D of TE modules composed of metal oxide materials and the prospect of their commercialization for energy harvesting is demonstrated.

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“…Good thermoelectric materials should have high figures of merit ZT, which is defined as S2rT/j, where S is the Seebeck coefficient, r is the electrical conductivity, j is the thermal conductivity and T is the absolute temperature. Since the discovery of good thermoelectric properties in Na xCoO 2 [3], layered cobaltites have been extensively investigated and a number of new layered cobalt oxides, such as [Ca 2 CoO 3 ] 0.62 CoO 2 [4], [Bi 2 Sr 2 O 4 ] x CoO 2 [5], [Ca 2 (Co 0.65-Cu 0.35 ) 2 O 4 ] 0.6 CoO 2 [6], [Sr 2 O 2 ] q CoO 2 [7] and [Pb 0.4 Co 0.7 Sr 1. 9 O 3 ] 0.56 CoO 2 [8], have been synthesized and examined as possible candidates for thermoelectric oxide materials.…”

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confidence: 99%