3. Gallium arsenide (GaAs) and indium arsenide (mAs) arc commonly used in semico

Question

3. Gallium arsenide (GaAs) and indium arsenide (mAs) arc commonly used in semiconductor industry and solar cell industry. GaAs and mAs both have the zinc blende crystal structure and arc soluble in each other at all concentrations. 1) Please sketch the phase diagram. Given the melting temperatures of GaAs and mAs arc 1,238 Degree C and 942 Degree C, respectively; 2) Picasc calculate the average molecular weight, average density of the solid solution which contains 40 wt % of In As. Given the densities of GaAs and mAs are 5.316 and 5.668 g/cm3, respectively and the molecular weights of GaAs and mAs arc 144,64 g/mol and 189.74 g/mol, respectively. 3) Please predict the volume of unit cell Vc and lattice parameter (unit cell edge length) a. (note: knowledge in chapters 12, 9, 3, 4)

Explanation / Answer

a)One phase diagram per substance.

GaAs. On the x axis put mol fraction of As in the mixture (0

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