A New Method to Determine the Orientations of Crystal Defects by Synchrotron Radiation

  • A new method was put forward to determine the orientations of crystal defects by synchrotron radiation.Instead of using monochromic radiation as it was done before,a simple method was proposed using white radiation to calculate directions of crystal defects.In order to do so,at least two topographs with different beam incident directions were needed.The direction of an image of a defect should be figured out first.It can be fixed by the angles between the direction of the image and [100],[010]and [001].Suppose the direction of the topograph is [u1 v1 w1]and the direction of the image in the first topograph is [cosα11,cosβ11,cosγ11],α1111 and γ11 are the angles between the image and [100],[010] and [001],respectively,then the direction of the defect should be in thd plane with normal n1=[u1 v1 w1]×[cosα11,cosβ11,cosγ11].Similarly,in the second topograph,the normal of the plane in which the same defect lies is n2=[u2 v2 w2]×[cosα12,cosβ12,cosγ12],in which [u2 v2 w2] is the direction of the second topograph,α1212, and γ12 are the angles between the direction of the image and [100],[010] and [001].Since the defect are normal to n1 and n2,its direction n can be calculated out as n=n1×n2=[u v w].Using this method,the directions of dislocations in natural diamond were calculated and the types of the dislocations were figured out.
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  • [1] Jenkinson A E. Phil. Tech. Rev., 1961/62, 23: 822 Jenkinson A E, Lang A R. Direct Observation of Imperfections. New York:Interscience, 1962. 4713 Lang A R, Makepeace A P W, Alexander W B et al. Journal of Crystal Growth, 1999, 200(3-4):446-4574 YU Wan-Li, LI Lan-Jie, TIAN Yu-Lian et al. Acta Mineralogica Sinica, 2001,21(1):39-42(in Chinese)(于万里,李兰杰,田玉莲等.矿物学报,2001, 21(1):39-42)5 YU Wan-Li, TAN Yu-Lian, JIANG Jian-Hua et al. Journal of Foundational Materials (in Chinese, in press)(于万里,田玉莲,蒋建华等.功能材料(待发表))6 Ramanan R R, Niranjana S, Goswami N et al. Acta Cryst.,1998, A54:163-1717 Yacoot A, Moreton Moore, Machado W G. J. Appl. Cryst., 1998, 31:767-7768 Machado W G, Moreton Moore, Yacoot A. J. Appl. Cryst., 1998, 31:777-782
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YU Wan-Li, LUO Yong-An, WANG Ming-Zhi, ZHENG Qiu-Ju, ZHANG Hui-Jun, TIAN Yu-Lian and HUANG Wan-Xia. A New Method to Determine the Orientations of Crystal Defects by Synchrotron Radiation[J]. Chinese Physics C, 2001, 25(S1): 110-115.
YU Wan-Li, LUO Yong-An, WANG Ming-Zhi, ZHENG Qiu-Ju, ZHANG Hui-Jun, TIAN Yu-Lian and HUANG Wan-Xia. A New Method to Determine the Orientations of Crystal Defects by Synchrotron Radiation[J]. Chinese Physics C, 2001, 25(S1): 110-115. shu
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Received: 1900-01-01
Revised: 1900-01-01
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A New Method to Determine the Orientations of Crystal Defects by Synchrotron Radiation

    Corresponding author: YU Wan-Li,
  • College of Material Science and Engineering,Yanshan University,Qinhuangdao 066004,China2 Institute of High Energy Physics,CAS,Beijing 100039,China

Abstract: A new method was put forward to determine the orientations of crystal defects by synchrotron radiation.Instead of using monochromic radiation as it was done before,a simple method was proposed using white radiation to calculate directions of crystal defects.In order to do so,at least two topographs with different beam incident directions were needed.The direction of an image of a defect should be figured out first.It can be fixed by the angles between the direction of the image and [100],[010]and [001].Suppose the direction of the topograph is [u1 v1 w1]and the direction of the image in the first topograph is [cosα11,cosβ11,cosγ11],α1111 and γ11 are the angles between the image and [100],[010] and [001],respectively,then the direction of the defect should be in thd plane with normal n1=[u1 v1 w1]×[cosα11,cosβ11,cosγ11].Similarly,in the second topograph,the normal of the plane in which the same defect lies is n2=[u2 v2 w2]×[cosα12,cosβ12,cosγ12],in which [u2 v2 w2] is the direction of the second topograph,α1212, and γ12 are the angles between the direction of the image and [100],[010] and [001].Since the defect are normal to n1 and n2,its direction n can be calculated out as n=n1×n2=[u v w].Using this method,the directions of dislocations in natural diamond were calculated and the types of the dislocations were figured out.

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