Zinc selenide properties

Note Zinc sulfide (ZnS) has higher mechanical properties and better erosion resistance than zinc selenide but its optical transmission is not as good. ... 

The electrochemical formation of zinc selenide from acidic solutions [485] and electrodeposition of zinc telluride thin films, its properties, and photoelectro-chemical applications were presented and discussed by Mahalingam et al. [486, 487]. 

Surfactants at Interfaces. Somewhat surprisingly, the successes described above in the in-situ studies of protein adsorption have not inspired extensive applications to the study of the adsorption of surfactants. The common materials used in the fabrication of IREs, thalliumbromoiodide, zinc selenide, germanium and silicon do, in fact, offer quite a range in adsorption substrate properties, and the potential of employing a thin layer of a substance as a modifier of the IRE surface which is presented to a surfactant solution has also been examined in the studies of proteins. Based on the appearance of the studies described below, and recent concerns about the kinetics of formation of self-assembled layers, (108) it seems likely that in-situ ATR studies of small molecules at solid - liquid interfaces ("wet" solids), will continue to expand in scope. 

Zinc selenide (yellow) and telluride (brown) have similar stractures to those of the sulfide, both existing in both wurtzite and zinc blende modifications. The selenide is used with zinc sulfide as a phosphor. It has the interesting property that it can act as a bine-green solid state laser bine-green laser action in solids is rare (most solid-state lasers function towards the red end, 635 nm or more, of the spectrum). At room temperature, laser action with the selenide at a wavelength of 525 nm (green) is observed and at -196°C at 495 nm (bine). Unfortunately the laser is relatively short-lived. Zinc telluride is a wide band gap semicondnctor whose electron transport properties in the form of thin films of stoichiometric and nonstoichiometric forms have been mnch studied. Its applications in optoelectronics, for example, as an optical recording material, have been reviewed. ... 

The crystals used in ATR cells are made from materials which have low solubility in water and are of very high refractive index. Such materials include zinc selenide (ZnSe), germanium (Ge) and thallium/iodide (KRS-5). The properties of these commonly used materials for ATR crystals are summarised in Table 3.3. Different designs of ATR cells allow both liquid and solid samples to be examined. 

A simulated rocket fuel, comprising a urethane-based binder of undisclosed composition and a material simulating rocket fuel (without its pyrotechnic properties), was provided in uncured form by an industrial partner. The sample was held at a temperature of 55 C for approx. 27 hrs and mid-IR spectra were collected every two minutes by placing a Remspec fiber-optic probe with a zinc selenide ATR head in direct contact with the curing mass. During the experiment, two interruptions occurred the first when cooling of the MCT detector failed for a short time, and the second when a software problem (since corrected) led to non-storage of collected data. 

IRTRAN 2) 900 nm better visible-region properties than zinc selenide... 

DLC coatings also have an opto-protective function, infrared window materials such as germanium, magnesium fluoride, cadmium telluride, zinc sulfide, and zinc selenide are rel h/ely soft and easily damaged and eroded by wind, rain, or particle impact. They have also poor resistance to corrosive environments. DLC coatings offer good protection with adequate optical properties. However, their narrow IR bandpass may limit the range of applications. 

K Shazad, DJ Olego, J Petruzzello. Optical and vibrational properties of doped zinc selenide epitaxial layers. J Lumin 52 17-39, 1992. 

Choice of Material for the Window. The material used for the window has to meet certain criteria. First, the wavelength range over which the transmission is satisfactory is important. The stability of the material in contact with the solution is also of importance (particularly for aqueous acid or alkaline electrolyte solutions). However, other parameters such as the refractive index, the hardness, the thermal expansion coefficient, the standard form in which the material is available, and even the price also influence its choice. Practically, for aqueous solutions, the selection is restricted to a few materials, including silicon, calcium fluoride, zinc sulfide, and zinc selenide. The main properties of these materials, together with those of KRS-5, KRS-6, and CdTe, are gathered in Table VI. Various examples of transmission curves are given also in Figure 21. 

The molar ratio of the III compound to the V compound is typically l/lO.t ] To obtain the desired semiconductor properties, dopants are added such as zinc (from diethyl zinc) or magnesium (from bis(cyclopentadienyl) magnesium) for p doping, and silicon (from silane) or selenium (from hydrogen selenide) for n doping. 

The electrolyte in the measurements of the thermodynamic properties of bismuth sele-nide and telluride and of antimony telluride was the easily melted mixture of anhydrous zinc chloride (analytic purity) with sodium and potassium chlorides (chemical purity grade). The melting point of this mixture was Tmp — 208 C. The thermodynamic properties of antimony selenide were determined using a mixture of aluminum chloride (distilled twice in vacuum) and sodium chloride (chemical purity grade). The meltii point of this mixture was Tmp = 150-155°C. 

Yellow cadmium sulfide is highly insoluble (more so than zinc sulfide) and can be predpitated from acidic solutions. Cadmium selenide is almost black and has no pigmentary properties, but is used in the semicondudor industry. 

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