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Indium is a silvery white metal with a strong luster, resembling a fresh cut of zinc in appearance. It belongs to the group of light metals. It is quite soft, moreover malleable and low-melting (melts at a temperature of 156.5 ° C). Indium can be easily cut with a knife; it is almost 5 times softer than lead. Leaves a mark on paper. It is quite rare, valuable and expensive metal. In terms of chemical properties, indium is similar to gallium and aluminum. Its atomic mass is 114.818 g / mol. The element consists of two isotopes, one of which has a rather weak β-radioactivity.. |
Silver - Ag, a mineral of the class of native elements, crystallizes in a cubic system, cubic-hexoctahedral symmetry. It is found in argenites (sulfide) and horny silver (silver chloride), and is also mined as a by-product of the purification of copper and lead. Silver was one of the first metals mastered by man. It is an excellent conductor of heat and electricity. Mexico is the main producer of silver, although silver ores are scattered throughout the world..
Silicon is a very rare mineral species from the class of native
elements. In fact, it is amazing how rarely the chemical element silicon,
which in bound form makes up at least 27.6% of the mass of the earth's
crust, is found in nature in its pure form. But silicon is strongly
associated with oxygen and is almost always in the form of silica - silicon
dioxide, SiO2 (quartz family) or in the composition of silicates (SiO44-).
Native silicon has been found as a mineral in the products of volcanic fumes
and as minute inclusions in native gold.
Nickel is a simple substance, ductile, malleable, transition metal of a
silvery-white color, at normal temperatures in air it is covered with a thin
oxide film. Chemically inactive. Refers to heavy non-ferrous metals, does
not occur in its pure form on earth - it is usually a part of various ores,
high hardness, well polished, is a ferromagnet - attracted by a magnet, in
Mendeleev's periodic system it is designated by the symbol Ni and has a 28
serial number.
Nickel is a malleable and ductile metal, from which the thinnest sheets and
tubes can be made. Tensile strength 400-500 MN / m2, elastic limit 80 MN /
m2, yield point 120 MN / m2; relative elongation 40%; modulus of normal
elasticity 205 Gn / m2; Brinell hardness 600-800 Mn / m2. In the temperature
range from 0 to 631K (the upper limit corresponds to the Curie point).
Ferromagnetism of nickel is due to the structural features of the outer
electron shells of its atoms. Nickel is a part of the most important
magnetic materials and alloys with a minimum value of the coefficient of
thermal expansion (permalloy, monel-metal, invar, etc.).
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Titanium is a light and durable metal with a silvery white
color. It has two crystal variants: α-Ti with a hexagonal
dense stacking lattice and β-Ti with cubic core stacking and
a polycrystalline transition temperature of α?β883°C.
Titanium and titanium alloys combine lightness, strength,
high corrosion resistance resistance, and low thermal
coefficient. Read more |
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Selenium is a brittle black non-metal, shiny at the fracture (stable allotropic form, unstable form - cinnabar red). Refers to chalcogenes. It is a part of the active centers of some proteins in the form of the amino acid selenocysteine. The human body contains 10-14 mg of selenium, most of it is concentrated in the liver, kidneys, spleen, heart, testes and spermatic cords in men. Selenium is a part of muscle tissue proteins, myocardial proteins.Read more Other NewsThink PinkGlobal Weekly Deal - Cutting D Global Weekly Deal - Cutting |
Aluminum is a very rare mineral of the copper-cupalite family of the subclass of metals and intermetallic compounds of the class of native elements. Mainly in the form of microscopic discharges of a continuous fine-grained structure. It can form lamellar or flaky crystals up to 1 mm., Whiskers up to 0.5 mm long are noted. with a filament thickness of several microns. Light paramagnetic metal of silvery-white color, easily forming, casting, machining.Read more Other ProjectsThermalLightweight Ste initiativeGlobal providing a |