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- Use the Born-Mayer equation to estimate the latticeenthalpy of calcium sulfide. CaS. The crystal adopts a rocksalt structure w ith the distance between the centres of nearest neighbours being 284 pm.Account for the following:(i) Schottky defects lower the density of related solids.(ii) Conductivity of silicon increases on doping it with phosphorus.How to determine the si or re side of flatvin??
- In a fcc arrangement of A and B atoms A are present at the corners of theunit cell and B are present at the face centres. If one atom of A is missingfrom its position at the corner, what is the formula of the compound?Sketch the [1̅010] directions in a hexagonal unit cellWhich would you expect to be the more ductile element,(a) Ag or Mo, (b) Zn or Si? In each case explain your reasoning.
- The thermal and mechanical processing of materials is an important step in ensuring that they have the appropriate physical properties for their intended application. Suppose a metallic element undergoes a phase transit ion in which its crystal structure changes from cubic close-packed to bodycentredcubic. (a) Does it become more or less dense? (b) By what factor does its density change?The electronic structure of a doped semiconductor isshown here. (a) Which band, A or B, is the valence band?(b) Which band is the conduction band? (c) Which regionof the diagram represents the band gap? (d) Which bandconsists of bonding molecular orbitals? (e) Is this an exampleof an n-type or p-type semiconductor? (f) If the semiconductoris germanium, which of the following elementscould be the dopant: Ga, Si, or P?The electronic structure of a doped semiconductor isshown here. (a) Which band, A or B, is the valence band?(b) Which band is the conduction band? (c) Which regionof the diagram represents the band gap? (d) Which bandconsists of bonding molecular orbitals? (e) Is this an exampleof an n-type or p-type semiconductor? (f) If the semiconductoris germanium, which of the following elementscould be the dopant: Ga, Si, or P? [Section 12.7]
- The equilibrium density of vacancies ns is given by Nexp(-Es/kT) , where N is the density of semiconductor atoms and Es is the energy of formation. Calculate ns in silicon at 27° C, 900 ° C, and 1200° C. Assume Es = 2.3 eV.The first LEDs were made from GaAs, which has a bandgap of 1.43 eV. What wavelength of light would be emittedfrom an LED made from GaAs? What region of theelectromagnetic spectrum does this light correspond to: ultraviolet,visible, or infrared?Two solids are shown below. One is a semiconductor andone is an insulator. Which one is which? Explain your reasoning.