The following figure are acquired using electron$-$based technologies to show the morphology $($a$,$b$)$ and crystalline structure $($d$)$ as well as element distribution $($e$).$ Please try to answer the following questions

$($i$)$ What is the technique used to acquire figure $\backslash (\backslash$mathbf$\{$a$\}\backslash )$ and $\backslash (\backslash$mathbf$\{$d$\}\backslash ),$ respectively?

$($i i$)$ It can be seen from figure $\backslash (\backslash$mathbf$\{$e$\}\backslash )$ that the Al and Zn elements are well distributed on the surface of the "ball". What is the technique used for such figure? What signal is used?

$($iii$)$ In figure d$,$ the distance between two planes is $\backslash (4\mathrm{.}7\backslash$AA $\backslash ).$ If you use XRD technique to detect the peaks, can you give the possible angles of the peak corresponding to this plane? $($the wavelength of the X$-$ray used is $\backslash (1\mathrm{.}54\backslash$AA $\backslash ))$