October 2009
Intermediate to advanced
503 pages
14h 28m
English
Content preview from Engineering Physics
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3.6 Powder method
X-ray powder method is usually carried for polycrystalline materials. The powder photograph is obtained in the following way. The given polycrystalline material is ground to fine powder and this powder can be taken either in a capillary tube made up of non-diffracting material or is just struck on a hair with small quantity of binding material and fixed at the centre of cylindrical Debye-Scherrer camera as shown in Fig. 3.12(a).
Figure 3.12 (a) Debye-Scherrer cylindrical camera; (b) Film mounted in camera; (c) Film on stretchout
A stripe of X-ray photographic film is arranged along the inner periphery of the camera. A beam ...