TEST BANK FOR Fabrication Engineering at the Micro and Nanoscale. 3rd Edition By Stephen A. Converted

2.1) The nearest neighbor Ga atoms are at (-a/4, a/4, -a/4), (-a/4, -a/4, a/4), (a/4, -a/4, -a/4), and (a/4, a/4, a/4). The distance 31/2 a/4 = 0.254 nm. The ionic lengths are given as rGa +1 ~ 0.081 nm and rAs -3 ~ 0.22 nm. Then the sum of the ionic distances is slightly larger than the a spacing in the crystal. 2.2) For the Ga atom at (a/4, a/4, a/4), the for nearest neighbors are at: (0, 0, 0), (a/2, a/2, 0), (a/2, 0, a/2) and (0, a/2, a/2). They are the As atoms on the faces of the ...