In: Chemistry
Can someone show me step by step how to determine the lattice constants of Graphite?
Out of the lattice model of graphite one can see that there are two different positions of the carbon atoms in the graphite crystal lattice: One with a neighboring atom in the plane below and one without neighboring atom in the lattice below . Consequently, the electrical conductivity of the graphite surface varies locally slightly so that the atoms without neighbors appear higher than the others. Therefore, the hexagonal in are twice much as the true hexagonal. The lattice constant was measured using easyScan software and the result is shown . Moreover, the analysis on data was done by using KaliedaGraph. This calculation gives us the lattice constant of (2.27±. 03) A. Also the an angle for hexagonal was measured and found to be (120.67±. 64)˚.
Calculate the lattice constant, a, of the cubic unit cell. If the space lattice is SC, the lattice constant is given by the formula a = [2 x r]. For example, the lattice constant of the SC-crystallized polonium is [2 x 0.167 nm], or 0.334 nm.