Laue method

1. LAUE METHOD PRESENTED BY RESHMA FATHIMA.K FIRST YEAR M.PHARM DEPT.OF.PHARMACEUTICS 2/27/2015 GRACE COLLEGE OF PHARMACY 1

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:- 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. 2/27/2015 GRACE COLLEGE OF PHARMACY 2

3. 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. 2/27/2015 GRACE COLLEGE OF PHARMACY 3

4. TRANSMISSION METHOD The Leonhardt chart is used for transmission patterns. 2/27/2015 GRACE COLLEGE OF PHARMACY 4

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6. 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. 2/27/2015 GRACE COLLEGE OF PHARMACY 6

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 2/27/2015 GRACE COLLEGE OF PHARMACY 7

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10. THANK YOU 2/27/2015 GRACE COLLEGE OF PHARMACY 10