Chapter 15, Problem 15B.2P

Interpretation Introduction

Interpretation:

The unit cell of polonium and the unit cell dimension has to be determined.

Concept Introduction:

Bragg’s law:

  $n\lambda =2d_{hkl}\sin \theta$

Where,

$\lambda =$ Wavelength of incident light

$d_{hkl}=$ Interplanar distance

$2\theta =$ Glancing angle

$n=$ Order of diffraction

  $\begin{array}{ccc}\text{Bravis}\text{lattice}& \text{Reflections}\text{present}\text{for}& \text{Reflections}\text{absent}\text{for}\\ \text{Primitive}\text{simple}\text{cubic}& \text{All}& \text{None}\\ \text{BCC}& \text{h+k+l=even}& \text{h+k+l=odd}\\ \text{FCC}& \text{h,k}\text{and}\text{l=}\text{unmixed}\left(\text{all}\text{even}\text{or}\text{odd}\right)& \text{h,k}\text{and}\text{l=}\text{mixed}\end{array}$