semivacancy

plural semivacancies

1. natural sciencesA vacancy defect in which two adjacent lattice sites are unoccupied and an atom occupies the interstitial site between the two vacant sites.

   In the undistorted configurations both a divacancy and a semivacancy pair belong to the symmetry point group D3d .

   2012, D. Shaw, Atomic Diffusion in Semiconductors, page 234

   1 more example

   The semivacancies are separated by a variable number of Ge adatoms in metastable T₄ positions and can diffuse or eventually merge back into a single vacancy.

   2008, Edmund G. Seebauer, Meredith C. Kratzer, Charged Semiconductor Defects: Structure, Thermodynamics and Diffusion, page 219