BORRMANN IMAGE OF DISLOCATION IN THE CRYSTAL OF THALLIUM ACID PHTHALATE | Zendy

Zhao Qinglan | Zendy; Guan Tietang | Zendy

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BORRMANN IMAGE OF DISLOCATION IN THE CRYSTAL OF THALLIUM ACID PHTHALATE

Author(s) -

Zhao Qinglan,

Guan Tietang

Publication year - 1993

Publication title -

acta physica sinica

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.199

H-Index - 47

ISSN - 1000-3290

DOI - 10.7498/aps.42.626

Subject(s) - thallium , contrast (vision) , dislocation , crystal (programming language) , materials science , optics , spiral (railway) , diffraction , core (optical fiber) , crystallography , physics , chemistry , computer science , composite material , metallurgy , programming language , mathematical analysis , mathematics

The crystal of thallium acid phthalate (TAP) is a newly developed X-rays analyzing ele-ment with higher diffraction power. The Bormann image of the spiral dislocations has been observed and studied by means of X-ray topography. It is shown that the image contrast with fine structure nearly in the core of dislocation is decreasing not only with decreasing the crystal thickness, but also with decreasing the Borrmann coefficient s so greatly as to blur or even to make the fine contrast information loss completely when the images are inversed from "white" to "black" in the contrast.

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