86 Chapter 2 Geometry of Crystals
twin plane 1:10
Figure 2-43 Stereographic projection of an FCC
crystal and its twin.
these poles are located by rotating the projection on a Wulff net until the pole of
the twin plane lies on the equator, after wh
1-3 Show that the velocity with which electrons strike the target of an X-ray tube
depends only on the voltage between anode (target) and cathode and not on the
distance between them. [The force on a charge 6 (coulomhs) by a field E (voltsarn)
*41 Derive an expression for the absorption factor of a diffractorneter specimen in the form
of a flat plate of finite thickness I. (Note that the absorption factor now depends on 9).
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