Question

Tetragonal crystal system has the following unit cell dimensions

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