Question

The utilised reflecting plane of lithium fluoride crystal has a interplanar distance of 2.5 angstrom calculate wavelength of second order defraction which has glancing angle 60°

Answer 1

Lithium fluoride is an inorganic compound with the chemical formula LiF. It is a colorless solid, that transitions to white with decreasing crystal size. Although odorless, lithium fluoride has a bitter-saline taste. Its structure is analogous to that of sodium chloride, but it is much less soluble in water.

The crystal structure of the Lithium Fluoride is therefore face centered cubic in which the fluorine and lithium ions alternate with the vertices of the cube. Details on the structure can be found in the post about sodium chloride: Sodium Chloride (NaCl) Crystal