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Amorphous Selenium Red

Our selenium page has over 260 facts that span 106 different quantities. Each entry has a full citation identifying its source. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. We are here for your questions anytime 24/7, welcome your consultation.

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Selenium | Article About Selenium By The Free Dictionary

Amorphous (red) powdery and colloidal selenium (density g/cm 3 at 25°C) are obtained by such methods as the reduction of selenious acid (H 2 SeO 3) from solution and the rapid cooling of selenium.Measurements have been made of the refractive index of amorphous selenium in the red and near infrared spectral region. The absorption coefficient of amorphous selenium has been measured in the.

Selenium | The Periodic Table at KnowledgeDoor

Selenium | Se Pubchem

Amorphous selenium is either a reddish powder or a black, vitreous solid; crystalline selenium is either red or gray, depending on the crystal structure. This element resembles sulfur.Red amorphous selenium is obtained by precipitating selenium from a solution of selenious acid in methanol or ethanol with hydrazine or a soluble salt thereof at a temperature between about 20°C. and the freezing point of the solution.

Allotropy of Selenium Atomistry

Crystalline Varieties of Selenium Monoclinic Selenium Monoclinic Selenium is obtained when a carbon disulphide solution of amorphous selenium is allowed to crystallise, for example by evaporation or by keeping red amorphous or vitreous selenium in contact with carbon disulphide.Jun 08, 2001· The best fit of (αhν) 1/n versus the photon energy, in the case of both amorphous and hexagonal selenium thin films, was obtained for n= 1 2. The extrapolation of the linear part gave band gap energy of eV for the amorphous, red selenium thin films , while for gray ones it.The absorption coefficient of amorphous selenium has been measured in the ultraviolet, visible and near infrared spectral regions. The transmission coefficients of several single crystals of selenium have been measured and an estimate made of the absorption coefficient in the wavelength range to μ.

Selenium (Se) | Selenium

Selenium has three allotropes. Pictured here is the black, glassy amorphous allotrope (with covered with a thin layer of the grey selenium allotrope; left) and the red amorphous selenium allotrope.

Selenium Facts Periodic Table of the Elements

An amorphous (noncrystalline), red, powdery form of selenium results when a solution of selenious acid or one of its salts is treated with sulfur dioxide. If the solutions are very dilute, extremely fine particles of this variety yield a transparent red colloidal suspension.Therefore, the red amorphous selenium has attracted much attention –. In natural environments, live cells, such as bacteria, fungi, yeasts and plants, are known to be capable of converting selenate and selenite to Se 0 [23] – [28].

Allotropes Part 3 | The Elements Handbook At Knowledgedoor

Selenium can be prepared with either an amorphous or a crystalline structure. The color of amorphous selenium is either red (in powder form) or black (in vitreous form). Crystalline monoclinic selenium is a deep red; crystalline hexagonal selenium, the most stable variety, is a metallic gray.Selenium can be prepd with either amorphous or crystalline structure. Amorphous is either red, in powder form or black, in vitreous form. Crystalline monoclinic selenium is deep red; crystalline hexagonal form, the most stable variety, is a metallic gray.Amorphous form softens at 40 °C and melts at 217 °C. It rarely occurs in its elemental state in nature, or as pure ore compounds. Crystalline selenium is a ptype semiconductor and electrically, it acts as a rectifier, and has marked photoconductive and photovoltaic action (converts radiant to electrical energy).Abstract. The adsorption behavior of 197 Hg and 183–185 Hg on red amorphous selenium (red aSe) and trigonal selenium (tSe) was investigated experimentally by offline and online gas chromatographic methods, in preparation of a sensitive chemical separation and characterization of the transactinides copernicium (Cn, Z = 112) and flerovium (Fl, Z = 114).

Selenium Periodic Table of Elements and Chemistry

Crystalline monoclinic selenium is a deep red color. Amorphous selenium is red in powder form and is black in vitreous form. Gray crystalline ‘metallic’ selenium conducts electricity better in the light than in the dark (photoconductive) and it can convert light directly into electricity (photovoltaic).

Selenium Se (Element 34) Of Periodic Table | Periodic

Selenium is a non metallic chemical element exists in several allotropic forms, although three are generally recognized. In chemical activity and physical properties it resembles sulfur and tellurium. It can be prepared with either an amorphous or a crystalline structure. The color of amorphous selenium is either red (in powder form) or black (in vitreous form).If you are interested in our products,please Free Consultation.

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