1. 1. LAUE METHOD PRESENTED BY RESHMA FATHIMA.K FIRST YEAR M.PHARM DEPT.OF.PHARMACEUTICS 5/5/2015 GRACE COLLEGE OF PHARMACY 1
2. 2. Laue Photographic Method The Laue method is mainly used to determine the orientation of large single crystals White radiation is reflected from, or transmitted through, a fixed crystal Two Types:- a. Transmission Method: In the transmission Laue method, the film is placed behind the crystal to record beams which are transmitted through the crystal. Leonhardt chart is used. 5/5/2015 GRACE COLLEGE OF PHARMACY 2
3. 3. a. Back Reflection Method: In the back-reflection method, the film is placed between the x-ray source and the crystal. The beams which are diffracted in a backward direction are recorded. 5/5/2015 GRACE COLLEGE OF PHARMACY 3
4. 4. The Leonhardt chart is used for transmission patterns. 5/5/2015 GRACE COLLEGE OF PHARMACY 4
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6. 6. a. Back Reflection Method: In the back-reflection method, the film is placed between the x-ray source and the crystal. The beams which are diffracted in a backward direction are recorded. 5/5/2015 GRACE COLLEGE OF PHARMACY 6
7. 7. Back Reflection Method ADVANTAGES It is the only method for the investigation of large and thick specimen. DISADVANTAGES A large crystal is required Greninger chart 5/5/2015 GRACE COLLEGE OF PHARMACY 7
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