Selenium and tellurium are moderately volatile (Lodders, 2003) and chalcophile elements (Guo et al., 1999; Hattori et al., 2002). They are present in the mantle at 2-3 orders of magnitude higher ...

Dear Colleagues, Selenium- and tellurium-bearing precious metal minerals are significant producers of Au, Ag, Pt, Pd, and potentially strategic elements if mineral processing methods are optimized for recovery. These minerals include many phases (e.g., Au-Ag-Te and Au-Ag-Se) and occur in many types of ore deposits from different backgrounds ...

nickel, selenium, sulfur, tellurium, and zinc. Fire refining and electrolytic refining are used to purify blister copper even further. In fire refining, blister copper is usually mixed with flux and charged into ... Crushing and grinding systems used in ore, flux, and slag processing also contribute to fugitive dust problems.

the Materials Research Society. When mixed together, both elements form an alloy. The size- and shape-dependent thermal and optical properties of this alloy are investigated …

Introduction. Selenium was discovered in 1817 by the Swedish scientist Jöns Jacob Berzelius, one of the founders of modern chemistry, who named it after selene, the Greek word of moon [1].Located right below selenium in the chalcogen group of the period table is its congener tellurium, which was actually discovered 35 years earlier, in 1782 …

Selenium and tellurium recoveries for BHVO-2 at different stages after digestion and chemical purification procedures are …

In this work, a new sample-sensitive and effective method for the analysis of arsenic, bismuth, tellurium, and selenium in soil samples by simultaneous detection using HG-MC-AFS was developed. The method detection limits for arsenic, bismuth, tellurium, and selenium are 0.19 μg/g, 0.10 μg/g, 0.11 μg/g, and 0.08 μg/g, respectively.

In this work, a tellurium-selenium (Te-Se) solid solution with trace antimony (Sb) doping was synthesized via the high pressure and high temperature method. It was found that slight Se doping into the Te sites not only had no impact on the hall mobility and carrier concentration, but also enhanced the density-of-state effective mass of Sb 0.003 ...

The average Platts Metals Week New York dealer price for 99.5%-pure selenium in 2018 increased by 76% to $18.97 per pound from of $10.78 per pound in 2017. The average price for 99.99%-pure tellurium (in warehouse, Rotterdam), as reported by Argus Media group–Argus Metals International, increased by 96% in 2018 to $73.67 per kilogram from …

Abstract. The leaching kinetics of selenium from selenium–tellurium-rich materials in sodium sulfite solutions was studied. The morphologies of …

Selenium and Tellurium Separation: Copper Cementation Evaluation Using Response Surface Methodology. by. Seyedreza Hosseinipour., Eskandar Keshavarz Alamdari. * and. Nima Sadeghi. …

selenium and tellurium compounds have also found utility as reagents in synthetic organic and inorganic chemistry. Many selenium species can act as mild oxidants v. and …

Selenium- and tellurium-based agents turn the oxidizing redox environment present in certain cancer cells into a lethal cocktail of reactive species that push these cells over a critical redox threshold and ultimately kill them through apoptosis. This kind of toxicity is highly selective: normal, healthy cells remain largely unaffected, since ...

In this study, the effect of selenium (SeNPs) and tellurium (TeNPs) nanoparticles was examined in two bacterial processes mediated by QS: violacein production by Chromobacterium violaceum and biofilm formation by Pseudomonas aeruginosa. For this purpose, quantification of the pigment production in the presence of …

Red or black deposits were confirmed as elemental selenium and tellurium, respectively. Selenium oxide and tellurium oxide were also found after growth of Trichoderma harzianum with 1 mM selenite ...

A novel library of sulfur-, selenium- and tellurium-based pseudopeptides has been prepared using the isocyanide-based Passerini and Ugi multicomponent reactions and a variety of selected building blocks. The resulting products were obtained in moderate to good yields, turning this approach to a promising synthetic avenue able to provide a ...

Amorphous selenium (a-Se) is a large-area compatible photoconductor that has received significant attention toward the development of UV and X-ray detectors for a wide range of applications …

The present article extensively reviews the eco-friendly production of metalloid nanoparticles, namely made of selenium (SeNPs) and tellurium (TeNPs), …

The Selenium Tellurium System," J. Inorganic Nuclear Chem ., 31 (3) 685–688 (1969). (Thermo; Experimental) Article Google Scholar. P. Unger and P. Cherin,"Coordination and Thermal Motion in Crystalline Selenium and Tellurium," Phys. of Selenium and Tellu- rium, Pergamon Press, Oxford, England, 223–229 (1969).

While the sticking coefficient of tellurium reached zero at temperatures above 150 °C, the sticking coefficient of selenium remained about 0.2 up to a film surface temperature of 60 °C, suggesting that selenium was supplied in different chemical forms. The direct and quantitative determination of the sticking coefficients provides important ...

The need to assist the development of Se and Te was recognized long ago, and the origins of the Selenium-Tellurium Development Association Inc. (STDA) date back to 1938. Over the years the STDA has played an active role in the technical development and use of the elements but, also, recently we have responded to environmental concerns about our ...

Selenium alloying suppresses hole concentrations and facilitates the p orbital connectivity, realising high-performance p-channel TFTs with an average field …

Over the past few years, selenium and tellurium have become chalcogenides of great interest owing to their unique photoconductive and thermoconductive properties . They are known as "E-tech" elements with characteristics similar to that of sulfur and are fundamental constituents of photovoltaic solar panels, …

Flash Vacuum Pyrolysis of Azides, Triazoles, and Tetrazoles. C. Wentrup. Chemistry. Chemical reviews. 2017. TLDR. Flash vacuum pyrolysis of azides is an extremely valuable method of generating nitrenes and studying their thermal rearrangements and preparatively useful precursors of cyanocyclopentadienes, carbazoles, and aza-analogues. Expand. 92.

The selenium oxygen clusters SeOn (n=1–5) and their anions: Structures and electron affinities. Journal of Molecular Structure: THEOCHEM 2008, 863 (1-3), 1-8.

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WEBdemand for selenium and tellurium is rising sharply. In 2010, "solar" applications are expected to push demand to 250 tons/yr for selenium and 200 tons/yr for tellurium.

Selenium (Se, atomic number 34, atomic weight 78.96) lies between arsenic and bromine and between sulfur and tellurium (Te, atomic number 52, atomic weight 127.61) in Group 6A (chalcogens) in the periodic table. It was discovered in 1817 by a Swedish chemist as a contaminant in sulfuric acid. Its name was derived from the Greek …

The backscattered electron image of the scrap Cu anode slime and EDS analysis of the marked particle are presented in Fig. 2 and Table 2, respectively.The brightest particles (spot 5) exhibit high concentrations of S, O, and Pb, thus confirming the presence of the PbSO 4 phase. Similarly, the grey particles (spots 2 and 4) can be …

Tellurium (Te) is a metalloid and rare element (1-5 ppm estimated abundance) belonging to the chalcogen group (XVI) and p-block of the periodic table that is naturally present in association with ...

1. Introduction. Selenium and tellurium have become key components in supporting the development of high-tech material industries [1, 2].Selenides exhibit promising semiconducting properties, which bring them wide applications in semiconductor devices [3], copper-indium-gallium-selenide thin film solar cells [4], printed circuit boards …

Here the typical molecular solids, selenium and tellurium, have been explored experimentally to unearth the process of pressure-induced molecular dissociation. Before molecular dissociation, both commensurately and incommensurately modulated structures have been observed in these two elements. Upon compression, the …

First, 4N grade tellurium was prepared as shown in Table 1.The major impurities in the tellurium (4N grade) were bismuth (Bi), antimony (Sb), tin (Sn), and selenium (Se) due to the characteristics of the source material, as we used thermoelectric devices recycled by pretreatment methods such as mechanical crushing, tumbling, and …

1. The Te-containing free-cutting steels usually contain more than 0.2% of sulfur, with a Te capacity of approximately 0.01–0.06%. The Te/S value in the steel is between 0.03 and 0.17. Part of the steels also contains a certain amount of Pb, becoming S, Pb and Te composite ultra-free-cutting steel.

The optical properties of tellurium and of trigonal and amorphous selenium have been investigated at wavelengths extending from the intrinsic absorption edge to about 152 microns using polarized radiation. The refractive indices of tellurium and trigonal selenium have been determined from 4 to 14 microns and from 9 to 23 microns, respectively.

Throughout the process of our study, a solvent extraction method has been developed to separate tetravalent selenium, Se(IV), and tetravalent tellurium, Te(IV), from the nitric acid medium using CYANEX 301/kerosene organic solution. The effects and influences of main parameters having an impact on the extraction process, such as acid …