نتایج جستجو برای: tellurium extraction
تعداد نتایج: 175227 فیلتر نتایج به سال:
This work presents a flexible thick-film Bismuth Tellurium/Antimony Tellurium (BiTe/SbTe) thermoelectric generator (TEG) with reduced material resistivity fabricated by screen printing technology. Cold isostatic pressing (CIP) was introduced to lower the resistivity of the printed thermoelectric materials. The Seebeck coefficient (α) and the resistivity (ρ) of printed materials were measured as...
2014 Some aspects of the thermodynamic state of CdTe crystals grown by different zone passing techniques (sealed ingot zone refining technique and THM in tellurium solvent) are considered with regard to the general objective of getting high resistivity crystals. A vapour growth technique, called sublimation THM, which reduces several drawbacks of classical THM using a tellurium solvent, is deve...
Industrial uses of tellurium are limited, and reported cases of tellurium absorption of occupational origin are rare. Two such cases are reported here. Both showed typical signs and symptoms of intoxication; in particular, the stench of sour garlic was noted on breath and from excreta. An unusual feature was the bluish-black discoloration of the webs of the fingers and streaks on the face and n...
2014 The energies of surface quantum levels of inversion layers in [0001] planes at the surface of tellurium, calculated from Shubnikov de Haas measurements, are compared with theoretical values obtained with the assumption of a triangular surface potential well. In the experimental concentration range, results are explained by the existence of a single sub-band, separated in two levels due to ...
2014 The orbital chemical shift of N.M.R., which measures the weight of non-s states in the chemical bond, can be related directly to the ionicity for tellurium compounds. In a molecular picture of the solid neglecting d states, the shift is a parabolic function of the number of p-electrons in the valence band. This number depends simply on the ionicity for tellurium bonds and can be modified b...
The through-thickness thermoelectric behavior of continuous carbon fiber epoxy-matrix composites is greatly improved by adding tellurium particles (13 vol.%), bismuth telluride particles (2 vol.%) and carbon black (2 vol.%). The thermoelectric power is increased from 8 to 163 lV/K, the electrical resistivity is decreased from 0.17 to 0.02.X.cm, the thermal conductivity is decreased from 1.31 to...
a tellurium dioxide crystal is presented. The all-optical acousto-optic effect describes the combination of laser generated ultrasound with acousto-optic interaction. Laser generated ultrasound spectra are analyzed for tellurium dioxide using a 266 nm and a 1064 nm pulsed source, and used to characterize the acoustooptic interaction. The interaction is shown to be dominated by longitudinal acou...
We present the results of neutron and X-ray scattering experiments on liquid tellurium. No dependence on temperature of the radius and the coordination number of the first neighbour shell has been found in the temperature range between 460 °C and 550 °C. We investigate the influence of the truncation of the Fourier transformation on the determined coordination number of nearest neighbours and o...
in this research, tellurium (te) film with thicknesses of 100-250 nm were deposited on ceramic substrates by thermal evaporation at 373 k. the thickness of the film was determined by rutherford backscattering spectroscopy. the influence of the thickness on the structural, morphological and molecular bonds was characterized using xrd, scanning electron microscope, and raman spectroscopy. the xrd...
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