Thermoelectric functionality of Ca3Co4O9 epitaxial thin films on yttria-stabilized zirconia crystalline substrate

Pérez-Rivero, Armando; Cabero, Mariona; Varela, M.; Ramı́rez, R.; Mompeán, F. J.; Santamarı́a, J.; Martínez, José Luis; Prieto, C.

doi:10.1016/j.jallcom.2017.03.191

Cited by 9 publications

(5 citation statements)

References 44 publications

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“…The layered oxides demonstrate a lower thermal conductivity than their non‐layered counterpart materials 1,2 . The thermal conductivity of the layered oxides has a strong anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal stability of the lepidocrocite‐type titanates by intercalation of large alkaline ions

et al. 2020

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The layered oxides demonstrate a lower thermal conductivity than their non-layered counterpart materials. 1,2 The thermal conductivity of the layered oxides has a strong anisotropy. For example, Bi 2−x Pb x Sr 2 Co 2 O y (x = 0, 0.4, and 0.6) has an out-of-plane thermal conductivity of 0.4 W/m K at room temperature (RT), 3 while its in-plane thermal conductivity is up to 3.5 W/m K. 4 Interestingly, Shen Y et al reported that the low thermal conductivity of layered Bi 4 Ti 3 O 12 persisted up to at least 1000°C despite a change in the crystal structure at 675°C. This work indicates that the low thermal conductivity of the layered Bi 4 Ti 3 O 12 is associated with the layered structure of the compound rather than the detailed arrangement of

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“…The layered oxides demonstrate a lower thermal conductivity than their non‐layered counterpart materials 1,2 . The thermal conductivity of the layered oxides has a strong anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal stability of the lepidocrocite‐type titanates by intercalation of large alkaline ions

et al. 2020

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“…The values of the modified ZT are calculated using the measured Seebeck coefficient and the electrical conductivity as a function of the temperature (from 40 to 210°C) published in our previous work 13 and the temperature dependent thermal conductivity of the fused silica published by Combis et al 24 Thanks to the thermal properties of the CuCrO 2 :Mg film, (Z'T) attained 2 × 10 −2 at 210°C, whereas CuCrO 2 :Mg bulk studied by Hayashi et al 26 reached only 0.008 at the equivalent temperature. Pérez-Rivero et al 17 published a Z'T of 7 × 10 −3 at 180°C in the case Ca 3 Co 4 O 9 epitaxial thin film on yttria stabilized zirconia crystalline substrate. In comparison, the value of (Z'T) of delafossite thin film is higher due to a higher Seebeck coefficient of CuCrO 2 :Mg and a lower thermal conductivity of the fused silica substrate.…”

Section: Resultsmentioning

confidence: 99%

“…Some authors took into account the contribution of the substrate in the ZT determination. 16 Pérez-Rivero et al 17 have calculated a modified figure of merit, ZT', using only the thermal conductivity of the substrate without any demonstration of the validity of this relation.…”

Section: Introductionmentioning

confidence: 99%

Determination of modified figure of merit validity for thermoelectric thin films with heat transfer model: Case of CuCrO2:Mg deposited on fused silica

Sinnarasa

Thimont

Presmanes

et al. 2018

Journal of Applied Physics

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Thermoelectric performance of a material is determined using a figure of merit (FOM) determined as ZT (ZT = σS2T/κ where σ is the electrical conductivity, S is the Seebeck coefficient, κ is the thermal conductivity, and T is the temperature). In the case of a thin film, it is normal in the first approach to consider calculating the FOM by using the thermal conductivity of the film. However, both the thermal influence of the substrate and the emissivity of the film must also be taken into account. In the present work, the heat transfer model is used in order to study the influence of the thermal conductivity, the thickness, and the emissivity of the film on the thermal gradient of the stack (substrate + thin film). The limits of these three parameters are determined in order to have the temperature variation due to the presence of the film compared to the substrate alone that remains less than 1%. Under these limits, the thermal conductivity of the substrate can be taken into account instead of the thermal conductivity of the thin film, and a modified FOM (Z’T) can be calculated. The present study leads to the determination of the validity of modified ZT. In the case of CuCrO2:Mg thin films, the model shows that the use of Z’T is valid. The calculated value of Z’T with the measured Seebeck coefficient and the electrical conductivity as a function of the temperature for 100 nm thick films and the temperature dependent thermal conductivity taken from the literature reached 0.02 at 210 °C. A thermoelectric module made with this material showed 10.6 nW when 220 °C is applied at the hot side.

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“…Similar behavior can be expected for thin films on other substrates, showing ionic conductivity, such as yttria-stabilized zirconia (YSZ), at sufficiently high temperatures and oxygen-rich atmospheres, with the advantage that YSZ crystals have generally low thermal conductivity, which may further improve the thermoelectric performance of the thin film. [84] 3. Enhancing Thermoelectricity in Transition Metal Oxide SLs by Electronic Reconstruction 3.1.…”

Section: Thin Films Of Perovskite Multilayers On Substrates In the Ox...mentioning

confidence: 99%

Tuning the Thermoelectric Properties of Transition Metal Oxide Thin Films and Superlattices on the Quantum Scale

Geisler

Yordanov

Gruner

et al. 2021

Physica Status Solidi (b)

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Thermoelectric functionality of Ca3Co4O9 epitaxial thin films on yttria-stabilized zirconia crystalline substrate

Cited by 9 publications

References 44 publications

Enhanced thermal stability of the lepidocrocite‐type titanates by intercalation of large alkaline ions

Enhanced thermal stability of the lepidocrocite‐type titanates by intercalation of large alkaline ions

Determination of modified figure of merit validity for thermoelectric thin films with heat transfer model: Case of CuCrO2:Mg deposited on fused silica

Tuning the Thermoelectric Properties of Transition Metal Oxide Thin Films and Superlattices on the Quantum Scale

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