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This is a list of prices of chemical elements. Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison. As of 2020, the most expensive non-synthetic element by both mass and volume is rhodium.
Binary metal-boron compounds, the metal borides, contain only boron and a metal. They are metallic, very hard, with high melting points. TiB 2, ZrB 2, and HfB 2 have melting points above 3000 °C. [68] Some metal borides find specialized applications as hard materials for cutting tools. [71]
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a The number n in the atom designation Bn,n refers to the B 12-nth icosahedron to which the Bn,n belongs. Si6.n and B6.n belong to the B 12 Si 3 unit. b,c,d The Si and B sites are in the same interstice, which is assumed to be fully occupied by both Si and B atoms with occupancies of Occ.(Si) and Occ.(B), respectively, where Occ.(Si)+Occ.(B) = 1.
Ferroboron (CAS Registry Number 11108–67-1) is a ferroalloy of iron and boron with boron content between 17.5 and 20%.[1]It is manufactured either by carbothermic reduction of boric acid in an electric arc furnace together with carbon steel, or by the aluminothermic reduction of boric acid in the presence of iron.
The borides can be classified loosely as boron rich or metal rich, for example the compound YB 66 at one extreme through to Nd 2 Fe 14 B at the other. The generally accepted definition is that if the ratio of boron atoms to metal atoms is 4:1 or more, the compound is boron rich; if it is less, then it is metal rich.
Soluble boron arranges in steels along grain boundaries. This inhibits the γ-α transformations (austenite to ferrite transformation) by diffusion and therefore increases the hardenability, with an optimal range of ~ 0.0003 to 0.003% B. [1] Additionally Fe 2 B has been found to precipitate at grain boundaries, which may also retard the γ-α transformations . [1]
43 Ca NMR data contains δ peak at -56.0 ppm and δ iso at -41.3 ppm where δ iso is taken as peak max +0.85 width, the negative shift is due to the high coordination number. [ 10 ] Raman Data: Calcium hexaboride has three Raman peaks at 754.3, 1121.8, and 1246.9 cm −1 due to the active modes A 1g , E g , and T 2g respectively.