Primitive and Non-Primitive Unit Cell | Crystal Structure

Unit cells are of two types, Primitive and Non-Primitive cells. In this lecture, we will discuss these two cells.

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[it]

4:10
The non-primitive example you gave isn't a unit cell though since repeating that at each lattice point(where lattice points are at the center of both atoms) doesn't maintain translational symmetry and hence aren't appropriately replicated
To find the non-primitive unit cell in this case, we'd need to consider the rectangle with the same colored atoms which would give us a rectangle with atoms at the edge centers and one atom at the body center
The primitive cell of this exact crystal would now connect 4 atoms of the same color with an atom of a different color in the middle to give a parallelogram
This also ends up minimising the volume like you said

[Qiwikk]

Sir can you please share using which software you animated this video?

[abdulmohsin]

😢 you just repeat only one thing
And desicribe it with different examples.
Primitive cell contain only one lattice points.
Non primitive cell contain more than 1 lattice points.



M i correct ✅

[soumyaranajnprusty]

All my doubts are clear after this video . 🙏

[Abiramip]

Even i don't know hindi, im able to understand the concepts well . I'm proud of myself 😂