Boron is a chemical element with the symbol B and atomic number 5


Boron is a chemical element with the symbol B and atomic number 5. Its crystalline form is a brittle, dark, lustrous metalloid; in its amorphous structure, it is a brown powder. As the lightest element of the boron group, it has three valence electrons for forming covalent bonds, resulting in many compounds such as boric acid, the mineral sodium borate, and the ultra-hard crystals of boron carbide and boron nitride. Boron is synthesized entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, so it is a low-abundance element in the Solar System and the Earth's crust.[10] It constitutes about 0.001 percent by weight of Earth's crust. It is concentrated on Earth by the water-solubility of its more common naturally occurring compounds, the borate minerals. These are mined industrially as evaporites, such as borax and kernite. The largest known deposits are in Turkey, the largest producer of boron minerals. Elemental boron is a metalloid found in small amounts in meteoroids, but chemically uncombined boron is not otherwise found naturally on Earth. Industrially, the very pure element is produced with difficulty because of contamination by carbon or other factors that resist removal. Several allotropes exist: amorphous boron is a brown powder; crystalline boron is silvery to black, extremely hard (about 9.5 on the Mohs scale), and a poor electrical conductor at room temperature. The primary use of the element itself is as boron filaments with applications similar to carbon fibers in some high-strength materials. Boron is primarily used in chemical compounds. About half of all products consumed globally are additive in fiberglass for insulation and structural materials. The subsequent leading use is in polymers and ceramics in high-strength, lightweight structural and heat-resistant materials. Borosilicate glass is desired for its greater strength and thermal shock resistance than ordinary soda lime glass. As sodium perborate, it is used as a bleach. A small amount is used as a semiconductor dopant and reagent intermediate to synthesize fine organic chemicals. A few boron-containing organic pharmaceuticals are used or are in the study. Natural boron comprises two stable isotopes, one of which (boron-10) has several uses as a neutron-capturing agent. If you are looking for high quality, high purity, and cost-effective boron, or if you require the latest price, please email contact mis-asia.

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Semiconductors of SiO2


History of Boron

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