| Popis: |
The concept itself of atomic planes, which is crucial in the definition of the quantity d 220, is rather fuzzy as it depends on several factors of influence. For example, we examine how the effect of gravity affects the deformation of the (220) Bragg planes. With this purpose, we start with the basic concepts of the linearised theory of elasticity, that is, the stress and strain tensors and how the elastic constants c 11, c 12, c 44 of the silicon crystal have to be recalculated when the atomic planes are differently oriented with respect to the macroscopic surfaces. The matrix operations are indicated and one of the very few solutions of equilibrium equations obtainable analytically is presented step by step. |
