Question

Tetragonal crystal system has the following unit cell dimensions

• A. $\text{a}=\text{b}=\text{c}$ and $\text{α}=\text{β}=\text{γ}=90^\circ $
• B. $\text{a}\neq \text{b}\neq \text{c}$ and $ \, \text{α}=\text{β}=\text{γ}=90^\circ $
• C. $\text{a}=\text{b}\neq \text{c} \, $ and $\text{α}=\text{β}=\text{γ}=90^\circ $
• D. $\text{a}=\text{b}\neq \text{c}$ and $\text{α}=\text{β}=90^\circ $ and $\text{γ}=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.