New non-superconducting layered Bi-oxide phases of formula Bi2M3Co2Oy containing Co instead of Cu

Tarascon, J. M.; Ramesh, R.; Barboux, P.; Hedge, M. S.; Hull, G. W.; Greene, L. H.; Giroud, M.; LePage, Y.; McKinnon, W. R.; Waszcak, J. V.; Schneemeyer, Lynn

doi:10.1016/0038-1098(89)91813-9

Cited by 87 publications

(35 citation statements)

References 7 publications

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“…But ρ(T) apparently deviates from TAC behavior with decreasing the temperature further, and it follows Mott's VRH model described by equation [32]: ρðTÞ¼ρ 0 exp½ðT 0 =TÞ n �. However, as for x ≥ 1.0, ρ(T) meets VRH model only, in agreement with the insulating feature of x = 2.0 single crystal [1,42,43]. Obtained values of ΔE and onset temperature T hopping are plotted in Figure 7e.…”

Section: Thermoelectrics For Power Generation -A Look At Trends In Thsupporting

confidence: 68%

“…A key to unveil mysterious thermoelectric properties lies in the twodimensional (2D) conducting CoO 2 layer. For layered Bi-A-Co-O (A = Ca, Sr, and Ba), it also contains analogous conducting CoO 2 layer [1]. In particular, layered Bi 2 Sr 2 Co 2 O y (BSC) exhibits a rather large thermoelectric power S (∼100 μV/K) at room temperature, which makes Bi 2 Sr 2 Co 2 O y one of promising thermoelectric materials from the viewpoint of potential applications, analogous to other misfit-layered cobaltites, such as NaCo 2 O 4 and Ca 3 Co 4 O 9 [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Layered Cobaltites and Natural Chalcogenides for Thermoelectrics

Ang¹

2016

Thermoelectrics for Power Generation - A Look at Trends in the Technology

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We have systematically investigated thermoelectric properties by a series of doping in layered cobaltites Bi 2 Sr 2 Co 2 O y , verifying the contribution of narrow band. In particular, Sommerfeld coefficient is dependent on charge carriers' density and as function of density of states (DOS) at Fermi level, which is responsible for the persistent enhancement of large thermoelectric power. Especially for Bi 2 Sr 1.9 Ca 0.1 Co 2 O y , it may provide an excellent platform to be a promising candidate of thermoelectric materials. On the other hand, high-performance thermoelectric materials require elaborate doping and synthesis procedures, particularly the essential thermoelectric mechanism still remains extremely challenging to resolve. In this chapter, we show evidence that thermoelectricity can be directly generated by a natural chalcopyrite mineral Cu 1+x Fe 1−x S 2 from a deepsea hydrothermal vent, wherein the resistivity displays an excellent semiconducting character, while the large thermoelectric power and high power factor emerge in the low x region where the electron-magnon scattering and large effective mass manifest, indicative of the strong coupling between doped carriers and localized antiferromagnetic spins, adding a new dimension to realizing the charge dynamics. The present findings advance our understanding of basic behaviors of exotic states and demonstrate that low-cost thermoelectric energy generation and electron/hole carrier modulation in naturally abundant materials is feasible.

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Section: Thermoelectrics For Power Generation -A Look At Trends In Thsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Layered Cobaltites and Natural Chalcogenides for Thermoelectrics

Ang¹

2016

Thermoelectrics for Power Generation - A Look at Trends in the Technology

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“…In 1989, Tarasoon et al [7] reported the cationic substitution of Cu by Co within 85 K Bi-based high-T c oxides to produce new phases of general formula Bi 2 M 3 Co 2 O y with M = Ca, Sr and Ba. Single crystals of these phases, grown using Co 3 O 4 (excess) flux, were investigated for their structural, magnetic and electrical properties.…”

Section: Methodsmentioning

confidence: 99%

Out‐of‐plane transport in Bi_2−xPb_xSr₂Co₂O_y single crystals

Ruan

Wang

et al. 2003

Physica Status Solidi (b)

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The transport properties of Bi 2-x Pb x Sr 2 Co 2 O y single crystals with various Pb contents are studied. The inplane resistivity ρ ab always shows metallic behavior from room temperature (290 K) to 80 K with various Pb contents, while the out-of-plane resistivity ρ c shows rather complex behavior. For Pb-free samples, ρ c shows semiconductive behavior in the measured temperature range. With increasing Pb content, the temperature dependence of ρ c shows an evolution from semiconductive through crossover to metallic behavior. According to the formula for ρ c proposed previously, the evolution of ρ c behavior is fitted well. Using the small polaron theory, the complex behavior of ρ c is interpreted.

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“…3 The chemical composition of this system was reported as Bi 2 M 3 Co 2 O 9 , and the structure was believed to be as a Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212) type one. The system becomes metallic by changing M site from Ca to Ba.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetism and Large Negative Magnetoresistance in Pb Doped Bi–Sr–Co–O Misfit-Layer Compound

et al. 2001

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Ferromagnetism and accompanying large negative magnetoresistance in Pb-substituted Bi-Sr-Co-O misfit-layer compound are investigated in detail. Recent structural analysis of (Bi,Pb)2Sr3Co2O9, which has been believed to be a Co analogue of Bi2Sr2CaCu2O 8+δ , revealed that it has a more complex structure including a CoO2 hexagonal layer [T. Yamamoto et al., Jpn. J. Appl. Phys. 39 (2000) L747]. Pb substitution for Bi not only introduces holes into the conducting CoO2 layers but also creates a certain amount of localized spins. Ferromagnetic transition appears at T = 3.2 K with small spontaneous magnetization along the c axis, and around the transition temperature large and anisotropic negative magnetoresistance was observed. This compound is the first example which shows ferromagnetic long-range order in a two-dimensional metallic hexagnonal CoO2 layer.

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New non-superconducting layered Bi-oxide phases of formula Bi2M3Co2Oy containing Co instead of Cu

Cited by 87 publications

References 7 publications

Layered Cobaltites and Natural Chalcogenides for Thermoelectrics

Layered Cobaltites and Natural Chalcogenides for Thermoelectrics

Out‐of‐plane transport in Bi_2−xPb_xSr₂Co₂O_y single crystals

Ferromagnetism and Large Negative Magnetoresistance in Pb Doped Bi–Sr–Co–O Misfit-Layer Compound

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New non-superconducting layered Bi-oxide phases of formula Bi2M3Co2Oy containing Co instead of Cu

Cited by 87 publications

References 7 publications

Layered Cobaltites and Natural Chalcogenides for Thermoelectrics

Layered Cobaltites and Natural Chalcogenides for Thermoelectrics

Out‐of‐plane transport in Bi2−xPbxSr2Co2Oy single crystals

Ferromagnetism and Large Negative Magnetoresistance in Pb Doped Bi–Sr–Co–O Misfit-Layer Compound

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Out‐of‐plane transport in Bi_2−xPb_xSr₂Co₂O_y single crystals