Question

Tetragonal crystal system has the following unit cell dimensions

• A. $a=b=c$ and $\alpha =\beta =\gamma =90^{\circ }$
• B. $a\ne b\ne c$ and $\alpha =\beta =\gamma =90^{\circ }$
• C. $a=b\ne c$ and $\alpha =\beta =\gamma =90^{\circ }$
• D. $a=b\ne c$ and $\alpha =\beta =90^{\circ }$ and $\gamma =120^{\circ }$

Answer 1

Answer: (C)

In crystallography, the tetragonal crystal system is one of the 7 crystal systems.

Tetragonal crystal lattices result from stretching a cubic lattice along one of its lattice vectors, so that the cube becomes a rectangular prism with a square base a and height c, which is different from a.