Thermal conductivity, electrical resistivity, and thermopower of aerospace alloys from 4 to 300 K

Hust, J G; Weitzel, D. H.; Powell, Robert L.

doi:10.6028/jres.075a.025

Cited by 24 publications

(5 citation statements)

References 1 publication

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“…Electrical conductivity is given by, σ = 1/ρ, where ρ is electrical resistivity (shown in the inset of figure 1) measured on the same sample which has been used for simultaneous thermopower and thermal conductivity measurements. The value of normalized Lorentz number is reasonably close to 1 at room temperature as in the case of elemental metals such as Cu [36], Al etc [37] which approximately validates the Wiedemann-Franz relation roughly in the temperature range 100-300 K in our system. Now, we calculate the electronic part of thermal conductivity using the Wiedemann-Franz relation κ e = L RT σT , where L RT (≈1.4 L 0 ) is the measured value of Lorentz number at room temperature (see inset of figure 3).…”

Section: Lapt 2 Si 2 : Thermopower and Thermal Conductivitysupporting

confidence: 83%

Thermal transport studies on charge density wave materials LaPt₂Si₂ and PrPt₂Si₂

Gupta

Rajeev²,

Hossain³

2018

J. Phys.: Condens. Matter

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We measured the thermal properties of polycrystalline samples of LaPt2Si2 and PrPt2Si2 using thermopower (S) along with thermal conductivity (κ) in the temperature range 10 K–300 K. Significant anomalies related to charge density waves (CDW) around 112 K and 88 K respectively have been observed in in both systems. Analysis of thermopower by a two band model suggests that the observations are consistent with a reduction of electron charge density. A change in slope accompanied by a drop in the value of thermal conductivity has been observed around TCDW in case of LaPt2Si2. Analysis of thermal conductivity of this material suggests that the CDW mainly affects electronic contribution to thermal transport. Only a slight change of slope has been detected in temperature dependent thermal conductivity in the case of PrPt2Si2 around TCDW, while its resistivity shows a clear anomaly which shows that electronic part of thermal conductivity is mainly influenced by the CDW in this case also. It is interesting to note that the lattice contribution to thermal conductivity remains unaffected by the CDWs in both materials.

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Section: Lapt 2 Si 2 : Thermopower and Thermal Conductivitysupporting

confidence: 83%

Thermal transport studies on charge density wave materials LaPt₂Si₂ and PrPt₂Si₂

Gupta

Rajeev²,

Hossain³

2018

J. Phys.: Condens. Matter

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“…A plot of the surface resistance (more precisely, it is wave resistance-a real part of wave impedance, because the Hastelloy layer is thick) as a function of temperature is shown in figure 9. As was expected from dc resistance of Hastelloy as a function of temperature measurements [31], R s of Hastelloy tape also exhibits very weak dependence on temperature.…”

Section: Ybco Tapessupporting

confidence: 72%

Microwave characterization of normal and superconducting states of MOCVD made YBCO tapes

Wosik

Křupka

Qin

et al. 2017

Supercond. Sci. Technol.

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We have used a microwave, non-contact, non-destructive, dielectric resonator (DR) technique to characterize complex conductivity of different quality YBCO/Hastelloy tapes for the purpose of exploring such a technique as a potential quality control method for fabrication of YBCO tapes. The tapes were deposited at different temperatures on Hastelloy-supported oxide buffer layers using the MOCVD technique. The buffer stack consisted of aluminum oxide (Al2O3), yttrium oxide (Y2O3), and textured ion beam assisted deposition-MgO and LaMnO3 layers. Two dielectric resonators (DRs), the single post DR, consisting of high-permittivity barium zirconium titanate ceramic operating at 13 GHz in quasi-TE01δ mode, and the rod DR, consisting of rutile single crystal disk operating at 9.4 GHz in-TE011 mode, were designed to meet sensitivity requirements for characterization of conductivity of the superconductor at normal and superconducting states, respectively. For calculations of complex conductivity from experimental data of Q-factor and resonant frequency shift, a commercial electromagnetic simulator HFSS, based on finite elements analysis, was used. The theoretical Q-factor and resonant frequency on conductivity functions obtained from full wave numerical simulations of microwave fields were matched with the experimental data to determine conductivity of the YBCO tapes in both normal and superconducting states. In addition, for comparison purposes, 280 nm thick high-quality YBCO epitaxial film deposited on a dielectric substrate was also characterized, including frequency dependence of the complex conductivity. Discussion about feasibility of using DR microwave techniques as a quality control tool via measurements of conductivity versus temperature slope of the YBCO/Hastelloy tape in normal state is included. Also, microwave conductivity values of Hastelloy substrate as a function of temperature are reported.

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“…The variation of electrical resistivity (1/ σ) with temperature for a set of aerospace alloys and the variation of thermal conductivity with temperature is represented in Figure 14. taken with permission from, [99].…”

Section: Aerospacementioning

confidence: 99%

Overview on thermoactive materials, simulations and applications

et al. 2019

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Thermoelectric (TE) materials have been attracting increasing interest once they are capable of directly convert temperature variations into electricity, being used in thermoelectric generators and thermoelectric sensor devices, among others. This work reports on the main principles of thermoelectric and thermomagnetic effects as well as the main materials used for the development of applications. Additionally, recent advances in the design and properties of thermoelectric materials, modelling approaches and some relevant applications are presented.

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Thermal conductivity, electrical resistivity, and thermopower of aerospace alloys from 4 to 300 K

Cited by 24 publications

References 1 publication

Thermal transport studies on charge density wave materials LaPt₂Si₂ and PrPt₂Si₂

Thermal transport studies on charge density wave materials LaPt₂Si₂ and PrPt₂Si₂

Microwave characterization of normal and superconducting states of MOCVD made YBCO tapes

Overview on thermoactive materials, simulations and applications

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Thermal conductivity, electrical resistivity, and thermopower of aerospace alloys from 4 to 300 K

Cited by 24 publications

References 1 publication

Thermal transport studies on charge density wave materials LaPt2Si2 and PrPt2Si2

Thermal transport studies on charge density wave materials LaPt2Si2 and PrPt2Si2

Microwave characterization of normal and superconducting states of MOCVD made YBCO tapes

Overview on thermoactive materials, simulations and applications

Contact Info

Product

Resources

About

Thermal transport studies on charge density wave materials LaPt₂Si₂ and PrPt₂Si₂

Thermal transport studies on charge density wave materials LaPt₂Si₂ and PrPt₂Si₂