Energy calculation of thermoelements with arbitrary temperature dependence of thermoelectric properties of materials by heat balance technique

Abstract Measurement of physical properties of materials in extreme conditions, such as high temperature, is limited by technological challenges. Nevertheless, modeling of several phenomena relies on the existence of experimental data for their validation. In this study, a method suitable for determination of density in a liquid phase at high temperature is proposed and tested on Al2O3–ZrO2 system. A methodology for acquiring the temperature dependence of density for radioactive materials is proposed and is aimed to refine severe nuclear accidents modeling. The oxide was melted in an induction furnace with a cold crucible. The measurement was based on evaluation of the volume of the melt at different temperatures, in a range from 2100 to 2400 °C. The densities of the oxide in the solid-state and the skull-layer were measured using a pycnometer. A temperature dependence of the density was established and the results were compared with literature. The difference between existing data and the measured values in this work was less than 5%. Thus, the proposed methodology provides reliable density values in extreme conditions.

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High-Temperature Thermoelectric Properties of Pb1-xSnxTe:In

MRS Proceedings ◽

10.1557/proc-1044-u04-09 ◽

2007 ◽

Vol 1044 ◽

Cited By ~ 2

Author(s):

Vladimir Jovovic ◽

Suraj Joottu Thiagarajan ◽

Joseph P. Heremans ◽

Dmitry Khokhlov ◽

Tanya Komissarova ◽

...

Keyword(s):

Electrical Resistivity ◽

Fermi Level ◽

Thermoelectric Properties ◽

Carrier Mobility ◽

Temperature Dependent ◽

Resonant Energy ◽

Properties Of Materials ◽

Valence Bands ◽

Increasing Temperature ◽

Positive Effect

AbstractIndium in Pb1-xSnxTe alloys forms a resonant energy level in the conduction or valence bands, depending on x. In this study we investigate temperature dependence of the In level from 80 to 400K, complementing our previous work at 80 K. Measurements of electrical resistivity, thermopower, Hall and transverse Nernst-Ettinghausen effect are used to assess carrier mobility, Fermi level and scattering coefficient. Measurements are performed on a set of p and n type Pb1-xSnxTe:In with 0 < x < 30 at% and In up to 3 at%. We show that with increasing temperature the Fermi level crosses into the gap. It had been suggested theoretically that hybridization of the In level with one band at the Fermi level could have had a positive effect on the thermoelectric properties of materials, but the present results illustrate the need for temperature-dependent modeling and experimentation.

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Research Advances of Typical Two Dimensional Layered Thermoelectric Materials

Research and Application of Materials Science ◽

10.33142/rams.v2i2.3166 ◽

2020 ◽

Vol 2 (2) ◽

Author(s):

Haihua HUANG ◽

Xiaofeng FAN

Keyword(s):

Structural Properties ◽

Thermoelectric Properties ◽

Thermoelectric Materials ◽

Electronic Devices ◽

Layered Materials ◽

Two Dimensional ◽

The Past ◽

2D Layered Materials ◽

Potential Applications ◽

Properties Of Materials

Thermoelectric technologies have caught our intense attention due to their ability of heat conversion into electricity. The considerable efforts have been taken to develop and enhance thermoelectric properties of materials over the past several decades. Recently, two-dimensional layered materials are making the promise for potential applications of thermoelectric devices because of the excellent physical and structural properties. Here, a comprehensive coverage about recent progresses in thermoelectric properties of typical two dimensional (2D) layered materials, including the theoretical and experimental results, is provided. Moreover, the potential applications of 2D thermoelectric materials are also involved. These results indicate that the development of 2D thermoelectric materials take a key role in the flexible electronic devices with thermoelectric technologies.

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