Features of the electron density distribution in antimony telluride Sb$_{2}$Te$_{3}$

Based on the results of electron density functional calculations of the electronic band structure of semiconductors Sb$_{2}$Te$_{3}$, Ge, Te, and semimetal Sb, the parameters of critical points in the electron density distribution (maxima, minima, and saddle points) in the lattices of the above materials are found. The data obtained are used to analyze the chemical bond nature in Sb$_{2}$Te$_{3}$.