Question

If $a$ , $b$ , $c$ are the lengths of three edges of unit cell, $\alpha$ is the angle between side $b$ and $c$ , $\beta$ is the angle between side $a$ and $c$ and $\gamma$ is the angle between side $a$ and $b$ , what is the Bravais Lattice dimensions of a tetragonal crystal?

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

Answer 1

Answer: (B)

$a = b \ne c$ and $\alpha = \beta = \gamma = 90^{\circ}$

Answer 2

Answer (b) $a = b \ne c$ and $\alpha = \beta = \gamma = 90^{\circ}$