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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.