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language
eng
Author
KOBAYASHI, Takuo Department of Material Science, Shimane University
TANIGUCHI, Hiromi Department of Physics, Saitama University
OKAMOTO, Hiroyuki Department of Health Sciences, Kanazawa University
Description
Crystalline perfection in organic charge-transfer complex single crystals, κ-(BEDT-TTF)2Cu[N(CN)2]Br, was characterized by means of synchrotron X-ray topography. Single crystals of κ-(BEDT-TTF)2Cu[N(CN)2]Br were grown electrochemically using a relatively large glass cell in order to scale up the synthesis. The quality of the crystals was examined using white and monochromatic X-ray topography. There was no asterism of each spot in the Laue photographs, though the defect image in the spot was not resolved because of low-resolution power of the white beam topography. We also obtained monochromatic X-ray topographs with 1.0 Å X-rays and were able to observe line images of dislocations. Dislocation density of the specimen was approximately 7 x 103 cm-2 on an average in the whole area of crystal. However, dislocation lines were annihilated in the topograph taken after annealing at room temperature for 5 months. Furthermore, new lattice defects were generated in the crystal after similar room temperature annealing for 15 months. The change of defect structure was caused by X-ray irradiation because dislocations in the un-irradiated crystal were observed by the monochromatic X-ray topography even after 2 years annealing at room temperature. Point defects formed by the X-ray irradiation probably interacted with grown-in dislocations and secondary defects were formed in the specimen crystal, though a long time was needed for this reaction at room temperature.
Subject
synchrotron radiation
topography
organic compound
Journal Title
Transactions of the Materials Research Society of Japan
Volume
38
Issue
4
Start Page
565
End Page
568
ISSN
1382-3469
ISSN(Online)
2188-1650
Published Date
2013/12/01
DOI
Publisher
一般社団法人 日本MRS
Publisher Transcription
イッパン シャダン ホウジン ニホン MRS
NII Type
Journal Article
Format
PDF
Text Version
出版社版
OAI-PMH Set
Faculty of Science and Engineering
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