Hi, I am trying to understand how do cluster of niobium atoms behave when I apply force to compress/stretch them. Niobium has a cubic lattice structure, 8 atoms on each corner and 1 in the center. So my question is let's say I have 2 of these cubes connected, and composed of 14 atoms. In X-Y Plane, approximately like this (6 atoms aren't shown below, they lie inside the page) *-----*-----* |--*--|--*--| *-----*-----* x x1 x: the distance between the atoms x1: the distance between the atoms x = x1 for now without any external force. What if I apply force on the 2 right most atoms and pull them to the right side. Is it going to work like a spring under Hooke's Law? I know the distance x and x1 will increase, however, are they going to increase the same amount or x1 will have a larger increase while x has a smaller increase? Your input is very much appreciated. Thank you.