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When people still do not know what is the boron, they had alreadydeal with boron. Around 200 BC, ancient Egypt,Rome, and theBabylonians had made of borax glass and welding Gold. Chinese ancientalchemists had been used borax, too. But the chemical composition of borax isstill a mystery until the early 19th century. Boron for non-metallic elements.Elemental boron has amorphous and crystalline two froms. The former is brownishblack to black boron powder; latter wasjet-black to silver-gray, show remarkable metallic luster, the hardness is likediamond, but with very high resistance, the electrical conductivity increaseswith temperature increasing. Amorphous elemental boron density is 2.3 g / cm 3 (25-27 ° C); crystallineelemental boron density is 2.31 g/ cm 3. Boron melting point of 2300 ° C, a boiling point of 2550 ° C.Boron crystalline have a plurality of allotrope,they are use the B12 icosahedron as the basic structural unit. This icosahedralis composed of 12 B atoms and 20 closer to equilateral triangle facet intersect30 edges and 12 corners, each corner of the top of an atom B occupies. The B12icosahedron connected in different ways, the key is also different, theformation of boron are also with different types of crystals, such as ±-diamondboron.Boron is relatively stable at roomtemperature, amorphous elemental boron can be slowly oxidized in air, can bespontaneous about 800 . Boron cannot react with hydrochloric acid or hydrofluoric acid, but can be a mixture ofhot concentrated nitric acid and sodium dichromate and sulfuric acid slowerosion and oxidation. Hydrogen peroxide and ammonium persulfate can also beslowly oxidation crystalline boron. Eutectic boron and alkali metal carbonatesand hydroxides mixture, all the various forms of boron are completely oxidized.The role of the chlorine, bromine, fluorine and boron to form the correspondingboron halide. At about 600 ° C, boron with sulfur violent reaction and generateda mixture of boron sulfide.Boron heated to above 1000 in a nitrogen or ammonia gas generated boron nitride ,1800-2000 when formed, boron and hydrogen is still not react. Boron and silicon in thereaction above 2000 boridesilicon. At high temperatures, the boron can react with many metals and metaloxides, to generate metal boride. Boron at 600 to 1000 ° C, can react withsulfur, tin, phosphorus, arsenic reaction; at 1000 ~ 1400 ° C, with thenitrogen, carbon, silicon effects, under high temperature boron also react withmany metals and metal oxides, metal boron compounds. These compounds are generallyhigh hardness, refractory, and high electrical conductivity, and chemicallyinert substances, often with special properties.The boron has the characteristics of thelow density, high strength and a high melting point, it is widely used in thefield of metallurgy and materials by metal powder supplier. Boron neutronabsorption capacity is particularly strong, and combined with a plastic oraluminum, is an effective neutron shielding material. Rod and strip boron steelis used as the control rods in nuclear reactors. Boron fibers used in themanufacture of the structural material of the composite material and themissile rocket. Boron at high temperatures is particularly lively, often usedto produce metallurgical degasifier, heated treatment of wrought iron and theincreased alloy steel high temperature robustness. Boron products: boride(boron tribromide; titanium diboride; chromium diboride; boron nitride; 99.99%of hexagonal boron nitride; 99.9% of hexagonal boron nitride), and boron alloyboron (boron, copper alloy; steel alloy). In agriculture, the boron can be madefertilizers, also can be good herbicides. Boric acid has a clean sterilizationeffect. Borax is also used in the glass industry.Source:http://www.mhcmp.com
Knowledge,the,boron,When,peopl