Research on the Influence of Temperature and Pressure on Volume, Enthalpy, Entropy, Debye Temperature, Electrical Resistivity, Thermal Conductivity and Thermal Diffusivity of AU with FCC Structure

Samples of sintered and arc-cast tungsten are available from NBS as thermal conductivity (SRM 730) and electrical resistivity (SRM 799) standards for the temperature range from 4 to 3000K. NBS recommended values for these properties above room temperature are based on results of various researchers during a previous international program which included arc-cast and sintered tungsten. The sintered tungsten used in this program was found to be unsuited for use as a standard material due to inhomogeneity and high temperature instability. The present paper gives results at high temperatures for thermal conductivity, electrical resistivity, specific heat, thermal diffusivity and Wiedemann-Franz-Lorenz ratio for a sample of the NBS sintered tungsten using the Properties Research Laboratory’s multiproperty apparatus. These results are compared to values recommended by the Thermophysical Properties Research Center, NBS, and an international program.

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4K-GM Cryocooler Performance and Thermal Conductivity of HoxEr1-xN

MRS Proceedings ◽

10.1557/opl.2013.557 ◽

2013 ◽

Vol 1492 ◽

pp. 53-58

Author(s):

Takanori Nakano ◽

Yusuke Hirayama ◽

Takushi Izawa ◽

Takashi Nakagawa ◽

Yasushi Fujimoto ◽

...

Keyword(s):

Thermal Conductivity ◽

Stainless Steel ◽

Electrical Resistivity ◽

Thermal Diffusivity ◽

Specific Heat ◽

Three Samples ◽

Regenerator Material

ABSTRACTHoxEr1-xN (x=0.25, 0.5, 0.75) samples were synthesized by nitriding of HoxEr1-x alloy bars and their thermal conductivity κ were measured. The measured κ values were comparable to those of stainless steel and Er3Ni. Ho0.5Er0.5N showed the highest κ of the present three samples. The thermal diffusivity calculated from the κ and the specific heat indicates that Ho0.5Er0.5N is a very promising regenerator material for the cryocoolers. The electrical resistivity ρ was also measured as a function of temperature.

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Influence of temperature and pressure on the electrical resistivity of gold and copper up to 1350 K and 100 GPa

Materials Research Bulletin ◽

10.1016/j.materresbull.2020.110874 ◽

2020 ◽

Vol 128 ◽

pp. 110874 ◽

Cited By ~ 1

Author(s):

Nguyen Quang Hoc ◽

Bui Duc Tinh ◽

Nguyen Duc Hien

Keyword(s):

Electrical Resistivity ◽

Influence Of Temperature ◽

Temperature And Pressure

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On the Jumps of Volume, Enthalpy and Entropy at the Melting Point, the Thermal Conductivity and Thermal Diffusivity for F.C.C. Au: the Temperature- and Pressure-Dependences

Uspehi Fiziki Metallov ◽

10.15407/ufm.22.04.511 ◽

2021 ◽

Vol 22 (4) ◽

pp. 511-530

Author(s):

Nguyen Quang  Hoc ◽

Bui Duc  Tinh ◽

Nguyen Duc  Hien ◽

Le Hong  Viet

Keyword(s):

Thermal Conductivity ◽

Thermal Diffusivity ◽

Melting Point ◽

Melting Curve ◽

Debye Model ◽

High Temperature And Pressure ◽

Enthalpy And Entropy ◽

Temperature And Pressure ◽

Limiting Condition ◽

Good Agreement

The melting temperature, the jumps of volume, enthalpy and entropy at the melting point, the isothermal compressibility, the thermal expansion coefficient, the heat capacity at constant volume, the Grüneisen parameter, the Debye temperature, the electrical resistivity, the thermal conductivity, and the thermal diffusivity for defective and perfect f.c.c. metals are studied by combining the statistical moment method (SMM), the limiting condition of the absolute stability of the crystalline state, the Clapeyron–Clausius equation, the Debye model, the Grüneisen equation, the Wiedemann–Franz law, and the Mott equation. Numerical calculations are carried out for Au under high temperature and pressure. The calculated melting curve of Au is in good agreement with experiments and other calculations. Obtained results are predictive and orient towards new experiments.

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The Iceland Research Drilling Project Crustal Section: Physical properties of some basalts from the Reydarfjordur borehole, Iceland

Canadian Journal of Earth Sciences ◽

10.1139/e85-167 ◽

1985 ◽

Vol 22 (11) ◽

pp. 1588-1593 ◽

Cited By ~ 2

Author(s):

Malcolm J. Drury

Keyword(s):

Thermal Conductivity ◽

Electrical Resistivity ◽

Thermal Diffusivity ◽

Measurement Techniques ◽

Physical Property ◽

Property Data ◽

Conductivity Increase ◽

Derived Properties ◽

History Of ◽

Physical Property Data

Thermal, electrical, and other physical property data are reported for a suite of basalts from the core of a 1.9 km hole at Reydarfjordur, eastern Iceland. The principal aim is to add to the literature thermal diffusivity data on basalts. Both lava-flow and dyke-intrusion samples have been measured, in roughly the proportion of their abundances in the drilled section. Density and porosity measurements are in good agreement with values published previously by others. Thermal conductivity values are approximately 10% higher than those published by others, probably because of differences in measurement techniques. Porosity of the samples generally decreases with depth because of increasing infilling of voids and cracks with alteration products. Density, thermal conductivity, thermal diffusivity, and the derived properties grain density and grain conductivity increase with depth, whereas electrical resistivity decreases. Bulk properties of the section have been estimated. They are thermal diffusivity, 0.70 mm2/s (0.70 × 10−6 m2/s); thermal conductivity, 1.97 W/m∙K; bulk density, 2.82 Mg/m3; and porosity, 0.039 (3.9%). Curves modelling in situ electrical resistivity indicate values in the range 50–3000 ?∙m. The electrical structure of the crust in the Reydarfjordur area is apparently different from that in southwest Iceland, probably reflecting a different history of hydrothermal circulation and alteration.

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Thermophysical Characterization of Genipap Pulp

International Journal of Food Engineering ◽

10.2202/1556-3758.1701 ◽

2010 ◽

Vol 6 (3) ◽

Cited By ~ 1

Author(s):

Normane Mirele Chaves da Silva ◽

Renata Cristina Ferreira Bonomo ◽

Luciano Brito Rodrigues ◽

Modesto Antonio Chaves ◽

Rafael da Costa Ihéu Fontan ◽

...

Keyword(s):

Experimental Data ◽

Thermal Conductivity ◽

Thermal Diffusivity ◽

Specific Heat ◽

Water Content ◽

Thermophysical Properties ◽

Empirical Models ◽

Influence Of Temperature ◽

Thermophysical Characterization

The influence of temperature and water content on thermophysical properties (density, thermal diffusivity, thermal conductivity and specific heat) of genipap (Genipa americana, L) pulp at medium maturity were studied. The thermophysical properties were determined at concentrations between 6.0% m/m and 24.0% m/m of water content and temperatures range of 5 to 80°C. The density decreased with increase in temperature and water content, while the thermal diffusivity and conductivity increased as temperature and water content increased. The specific heat decreased with the moisture content. Empirical models were fitted to the experimental data for each property and the accuracy of those models was checked.

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Nanostructured kesterite (Cu2ZnSnS4) for applications in thermoelectric devices

Powder Diffraction ◽

10.1017/s0885715619000277 ◽

2019 ◽

Vol 34 (S1) ◽

pp. S42-S47 ◽

Cited By ~ 8

Author(s):

E. Isotta ◽

N. M. Pugno ◽

P. Scardi

Keyword(s):

Thermal Conductivity ◽

Electrical Resistivity ◽

Thermal Diffusivity ◽

Thermal Treatment ◽

Large Fraction ◽

Milled Powder ◽

High Energy ◽

Tetragonal Form ◽

Cubic Structure ◽

Positive Effect

Kesterite (Cu2ZnSnS4, CZTS) powders were produced by reactive high-energy milling, starting from stoichiometric mixtures of the elemental components. CZTS forms fine crystals with a cubic structure, which evolves to the stable tetragonal form after thermal treatment. Tablets were produced by cold pressing of the ball milled powder, and sintered up to 660 °C. Seebeck coefficient, electrical resistivity, and thermal diffusivity were measured on the sintered tablets, pointing out the positive effect of CZTS nanostructure and of the rather large fraction of porosity: thermal conductivity is rather low (from ~0.8 W/(m K) at 20 °C to ~0.42 W/(m K) at 500 °C), while electrical conduction is not seriously hindered (electrical resistivity from ~8500 µΩ m at 40 °C to ~2000 µΩ m at 400 °C). Preliminary results of thermoelectric behavior are promising.

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