Peltier refrigerator using a high <i>T</i>
                  <i>c</i> superconductor

Fee, M.

doi:10.1063/1.108774

Cited by 22 publications

(8 citation statements)

References 9 publications

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“…The Figure of merit is the deciding factor for the quality of thermoelectric materials. In order to increase the whole Figure of merit, it is of interest to replace the p-type leg of the Peltier junction by a thermoelectrically passive material with a Figure of merit close to zero [16]. This is why it is interesting to study the Figure of merit of the ceramic superconductors.…”

Section: Introductionmentioning

confidence: 99%

Thermal and electrothermal characterization of bismuth based high-Tc superconductors

Anis-ur-Rehman

2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Thermal and electrothermal characterization of bismuth based high-Tc superconductors

Anis-ur-Rehman

2009

Journal of Alloys and Compounds

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“…Interest in the alloy was revived by the discovery of high T c superconductors and the work of Dashevskii et al showing that the total dimensionless figure of merit is approximately equal to the value of ZT for the n-type couple [6][7][8][9]. As group V metals, Bi 1-x Sb x forms a solid solution over the entire composition range, being semimetallic outside the range 0.07 \ x \ 0.22 where the alloy is semiconducting with the largest gap occurring around 17 % Sb concentration [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of Ho-doped Bi0.88Sb0.12

et al. 2012

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The Seebeck coefficients, electrical resistivities, total thermal conductivities, and magnetization are reported for temperatures between 5 and 350 K for n-type Bi 0.88 Sb 0.12 nano-composite alloys made by Ho-doping at the 0, 1, and 3 % atomic levels. The alloys were prepared using a dc hot-pressing method, and are shown to be single phase for both Ho contents with grain sizes on the average of 900 nm. We find the parent compound has a maximum of ZT = 0.28 at 231 K, while doping 1 % Ho increases the maximum ZT to 0.31 at 221 K and the 3 % doped sample suppresses the maximum ZT = 0.24 at a temperature of 260 K.

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“…For low temperatures (50 K-250 K) the best thermoelectric material are monocrystalline Bi-Sb alloys. However, there have been any studies focused to use the high temperature superconductors as passive thermoelements [4,[7][8][9][10]. This kind of devices have not been success due mainly to the critical temperature of these superconducting materials (≈ 90K) and their current density values that they can transport in their superconducting state.…”

Section: Introductionmentioning

confidence: 99%

YBCO samples as a possible thermoelectric material

Rodriguez

2005

phys. stat. sol. (c)

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We have performed a study of thermoelectric properties of polycrystalline Y Ba 2 Cu 3 O 7−δ (YBCO) samples syntherized from oxides by solid state reaction. The Seebeck coefficient, (S), electrical resistivity (ρ) and thermal conductivity (κ) of these Y-based high temperature superconductors were measured in the temperature range between 77 K and 300 K. The samples were submitted to different thermal processes at 600•C in vacuum in order to change both the oxygen content (7 − δ) and its ordering. The Seebeck coefficient was measured by differential method in which the sample is heated periodically with a frequency of 50 mHz. It is positive in whole measurement range and show a weak linear behavior with the temperature and its magnitude change from 3 × 10 −5 V /K for the samples annealed during one hour to 1 × 10 −3 V /K for the samples annealed through 50 hours. The electrical resistivity was measured by standard four-probe method and its behavior changes from metallic to semiconductor as the annealing time is increasing. The magnitude of ρ(T ) increases when the annealing time increases from 6.9 × 10 −3 Ωcm to 9.2 × 10 −1 Ωcm for the samples annealed 50 hours. The thermal conductivity data was obtained by means of longitudinal heat-flow method in which the sample is heated with a frequency of 30 mHz and κ(T ) was calculated from Fourier law. The accuracy of the κ(T ) data was 0.1 W/mK. In all samples κ(T ) is less than 4 W/mK and exhibit a weak linear behavior with the temperature, its magnitude decreases with the annealing time. The performance of thermoelectric material is determined by the dimensionless merit figure ZT, which is defined in terms of Seebeck coefficient, electrical resistivity and thermal conductivity as: ZT = S 2 T /ρκ. ZT(T) exhibit an enhancement up to reach values close to 0.6 which are comparable to those of conventional thermoelectric semiconductors. This behavior suggests that the charge carrier density and scattering mechanisms can be modify by decreasing the oxygen level present in YBCO samples, which opens the possibility to use these kind of materials as active thermo-elements below room temperature.

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Peltier refrigerator using a high T c superconductor

Cited by 22 publications

References 9 publications

Thermal and electrothermal characterization of bismuth based high-Tc superconductors

Thermal and electrothermal characterization of bismuth based high-Tc superconductors

Thermoelectric properties of Ho-doped Bi0.88Sb0.12

YBCO samples as a possible thermoelectric material

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