Question

the parameters that characterise a unit cell

Answer 1

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$\textbf{Diagram}$

$\setlength{\unitlength}{5mm}\begin{picture}(5,5)\multiput(0,0)(0,6){2}{\multiput(0,0)(2,1){2}{\line(1,0){12}}\multiput(0,0)(12,0){2}{\line(2,1){2}}}\multiput(0,0)(12,0){2}{\multiput(0,0)(2,1){2}{\line(0,1){6}}}\end{picture}$

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$\textbf{Explaination}$

In three dimensional crystal structure, unit cell is characterised by :–

• It's dimensions along the three edges a, b, c. These edges may or may not be mutually perpendicular.

• Angles between the edges, $\alpha$,$\beta$, $\gamma$. Thus, a unit cell is characterized by six parameters a, b, c, $\alpha$, $\beta$, $\gamma$.

This parameters of a typical unit cell are shown in above figure.

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Answer 2

Answer:

1. axial distances or edge lengths
2. axial angles

Explanation:

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