BP (boron phosphide) is a valuable wear-resistant hard coating that is produced

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BP (boron phosphide) is a valuable wear-resistant hard coating that is produced by the reaction of boron tribromide and phosphorus tribromide under a hydrogen atmosphere at high temperature (>750 degree C). This ceramic material is used as a protecting thin film on metal surfaces. BP crystallizes in a cubic-close-packed structure with tetrahedral surrounding. Give the equation for the formation of BP. Draw the Lewis structures of boron tribromide and phosphorus tribromide. Draw the structure of BP in the crystalline state. Give the overall composition of the unit cell corresponding with the formula BP. Calculate the density of BP in kg m^-3 when the lattice parameter of the unit cell is 4.78 A. Calculate the distance between a boron and a phosphorus atom in BP. The Born-Lande formula given below can be used to calculate the lattice energy: The factor fe^2 amounts to 1390 when the ionic radii r_+ and r_- are given in A. The Madelung constant is 1.638. The Born exponent i

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BP (boron phosphide) is a valuable wear-resistant hard coating that is produced

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