Question

1.37 Si and SiO$_2$ a. Given the Si lattice parameter $a = 0.543$ nm, calculate the number of Si atoms per unit volume, in nm$^{-3}$. b. Calculate the number of atoms per m$^2$ and per nm$^2$ on the (100), (110), and (111) planes in the Si crystal as shown in Figure 1.81. Which plane has the most number of atoms per unit area? c. The density of SiO$_2$ is 2.27 g cm$^{-3}$. Given that its structure is amorphous, calculate the number of molecules per unit volume, in nm$^{-3}$. Compare your result with (a) and comment on what happens when the surface of an Si crystal oxidizes. The atomic masses of Si and O are 28.09 and 16, respectively.

          1.37 Si and SiO$_2$
a. Given the Si lattice parameter $a = 0.543$ nm, calculate the number of Si atoms per unit volume, in nm$^{-3}$.
b. Calculate the number of atoms per m$^2$ and per nm$^2$ on the (100), (110), and (111) planes in the Si crystal as shown in Figure 1.81. Which plane has the most number of atoms per unit area?
c. The density of SiO$_2$ is 2.27 g cm$^{-3}$. Given that its structure is amorphous, calculate the number of molecules per unit volume, in nm$^{-3}$. Compare your result with (a) and comment on what happens when the surface of an Si crystal oxidizes. The atomic masses of Si and O are 28.09 and 16, respectively.

1.37 Si and SiO2
a. Given the Si lattice parameter a = 0.543 nm, calculate the number of Si atoms per unit volume, in nm^-3.
b. Calculate the number of atoms per m^2 and per nm^2 on the (100), (110), and (111) planes in the Si crystal as shown in Figure 1.81. Which plane has the most number of atoms per unit area?
c. The density of SiO2 is 2.27 g cm^-3. Given that its structure is amorphous, calculate the number of molecules per unit volume, in nm^-3. Compare your result with (a) and comment on what happens when the surface of an Si crystal oxidizes. The atomic masses of Si and O are 28.09 and 16, respectively.

Added by Christopher W.

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