Thermoelectric properties of Gd/W double substituted calcium manganite

Reimann, Timmy; Töpfer, J.

doi:10.1016/j.jallcom.2016.12.359

Cited by 19 publications

(27 citation statements)

References 26 publications

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“…The BET specific surface of the powder is S = 9.3 m²/g corresponding to a particle diameter of d BET = 140 nm, assuming spherical particles. 23 The addition of 2 wt% CuO significantly improves the low-temperature firing behavior of GdW-CMO; shrinkage already starts at T = 700°C and the temperature of maximum shrinkage rate is at 1000°C (Figure 1). 23 In order to enable co-firing of GdW-CMO tapes with printed AgPd stripe contacts, sintering of the perovskite particles has to take place at lower temperature.…”

Section: Powder Synthesis and Sintering Behaviormentioning

confidence: 97%

“…23 In order to enable co-firing of GdW-CMO tapes with printed AgPd stripe contacts, sintering of the perovskite particles has to take place at lower temperature. The BET specific surface of the powder is S = 9.3 m²/g corresponding to a particle diameter of d BET = 140 nm, assuming spherical particles.…”

Section: Powder Synthesis and Sintering Behaviormentioning

confidence: 99%

“…23 In order to enable co-firing of GdW-CMO tapes with printed AgPd stripe contacts, sintering of the perovskite particles has to take place at lower temperature. 23 Slow cooling of the samples after sintering in air is required for complete reoxidation. The sintering behavior of powder compacts with 0% and 2 wt% CuO sintering additive was studied by dilatometry ( Figure 1).…”

Section: Powder Synthesis and Sintering Behaviormentioning

confidence: 99%

“…23 The composition with x = 0.01 was selected for the fabrication of transversal multilayer TEGs, since it exhibits the best performance within this substitution series with a power factor of 380 lW/(K²m) at 300°C and figure of merit ZT = 0.12 at 700°C. A significant concentrations of Mn 3+ and hence electronic charge carriers is already created at small substitution rates x, and the conductivity increases upon substitution.…”

Section: Powder Synthesis and Sintering Behaviormentioning

confidence: 99%

“…As proof of principle, La 1.97 Sr 0.03 CuO 4 (LSCO) p-type thermoelectric oxide pellets were arranged as multilayer stack interweaved with diagonal stripes of printed silver contacts. 23 In this contribution, for the first time, we report on the fabrication of a TMLTEG using substituted CaMnO 3 as n-type thermoelectric, in combination with AgPd contacts. 13 A maximum power output of 4.0 mW was determined at DT = 225 K for this transversal multilayer TEG device.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of a transversal multilayer thermoelectric generator with substituted calcium manganite

et al. 2017

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The sintering behavior and thermoelectric performance of Ca0.99Gd0.01Mn0.99W0.01O3 was studied, and a multilayer thermoelectric generator was fabricated. The addition of CuO as sintering additive was found to be effective for the reduction in the sintering temperature from 1300°C to about 1000°C-1050°C. Dense samples were obtained after firing at 1050°C, whereas some porosity remained after firing at 1000°C. Samples sintered at reduced temperature exhibit lower electrical conductivity, whereas the Seebeck coefficient S = −150 μV/K at 100°C is not affected by lowering the sintering temperature. The figure of merit is ZT = 0.12 at 700°C for samples sintered at 1300°C; ZT = 0.08 and 0.03 were obtained for multilayer laminates sintered at 1050°C and 1000°C, respectively. A transversal multilayer thermoelectric generator (TMLTEG) was built by stacking layers of substituted CaMnO3 green tapes, and printing AgPd conductor stripes onto the thermoelectric layers at an angle of 30° relative to the direction of the heat flow. The multilayer stack was co-fired at 1000°C. The TMLTEG has a power output of 2.5 mW at ∆T= 200 K in the temperature interval of 25°C-300°C. A meander-like generator with larger power output comprising six TMTEGs is also presented

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Section: Powder Synthesis and Sintering Behaviormentioning

confidence: 97%

Section: Powder Synthesis and Sintering Behaviormentioning

confidence: 99%

Section: Powder Synthesis and Sintering Behaviormentioning

confidence: 99%

Section: Powder Synthesis and Sintering Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication of a transversal multilayer thermoelectric generator with substituted calcium manganite

et al. 2017

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A Study on the Effects of La/Sm Codoping on the Structural and High Temperature Thermoelectric Properties of n‐Type CaMnO₃₋_δ Perovskite

Vijay

Prasanth

Jose

et al. 2022

Crystal Research and Technology

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Oxide thermoelectric ceramics attract extensive research interest due to their excellent thermal stability, non-toxicity, cost-effectiveness, and earth-abundant constituent elements. In the present work, the authors study the effect of lanthanum (La) and samarium (Sm) co-doping on the structural, microstructural, and thermoelectric properties of CaMnO 3 ceramics. The X-ray diffraction (XRD) studies show an increase in unit cell volume with an increase in Sm concentration. A shift in Raman modes is observed, confirming distortions in MnO 6 octahedra with the substitution of rare-earth elements. The co-doping strategy leads to a two-order increment in electrical conductivity and reduction in thermopower as expected due to the increase in Mn 3+ and charge carrier concentration. The highest electrical conductivity value attained is ≈200 S cm −1 at around 570 K for La 0.025 Sm 0.1 Ca 0.875 MnO 3 . The maximum value of thermoelectric power factor achieved is 194 𝝁W m -1 K -2 , which is two orders higher than that of the undoped CaMnO 3 .

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Improvement of thermoelectric properties of Ca0.9Gd0.1MnO3 by powder engineering through K2CO3 additions

et al. 2018

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Oxide materials based on calcium manganite show clear prospects as thermoelectrics, provided by their stability at high temperatures and inherent flexibility in tuning the relevant electrical and thermal transport properties. Donor-doped CaMnO 3 is an n-type semiconductor with a perovskite structure and relatively high thermoelectric performance. In this work, the precursor powders have been modified through potassium carbonate additions to produce Ca 0.9 Gd 0.1-MnO 3 pellets without the usual delamination problems occurring during the compaction process. In order to demonstrate the relevant effects, several samples with different amounts of potassium carbonate (0-15 wt%) have been prepared. The results showed that potassium additions significantly facilitate the compaction procedure, while also improving the thermoelectric performances. The results also highlight the importance of porosity control for improving ZT, by decreasing the thermal conductivity without reduction of the electrical performance. The highest ZT values were observed for the samples processed at 15 wt% of potassium carbonate addition, exhibiting an improvement at least 30% at 800°C when compared to the pure samples.

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Thermoelectric properties of Gd/W double substituted calcium manganite

Cited by 19 publications

References 26 publications

Fabrication of a transversal multilayer thermoelectric generator with substituted calcium manganite

Fabrication of a transversal multilayer thermoelectric generator with substituted calcium manganite

A Study on the Effects of La/Sm Codoping on the Structural and High Temperature Thermoelectric Properties of n‐Type CaMnO₃₋_δ Perovskite

Improvement of thermoelectric properties of Ca0.9Gd0.1MnO3 by powder engineering through K2CO3 additions

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Thermoelectric properties of Gd/W double substituted calcium manganite

Cited by 19 publications

References 26 publications

Fabrication of a transversal multilayer thermoelectric generator with substituted calcium manganite

Fabrication of a transversal multilayer thermoelectric generator with substituted calcium manganite

A Study on the Effects of La/Sm Codoping on the Structural and High Temperature Thermoelectric Properties of n‐Type CaMnO3−δ Perovskite

Improvement of thermoelectric properties of Ca0.9Gd0.1MnO3 by powder engineering through K2CO3 additions

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A Study on the Effects of La/Sm Codoping on the Structural and High Temperature Thermoelectric Properties of n‐Type CaMnO₃₋_δ Perovskite