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Hot pressing of germanium monochromator crystals
Author(s) -
Treviño S. F.,
Mildner D. F. R.
Publication year - 2004
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889804001785
Subject(s) - monochromator , germanium , materials science , isotropy , pressing , crystal (programming language) , optics , mosaic , anisotropy , crystallography , composite material , physics , optoelectronics , chemistry , wavelength , archaeology , silicon , computer science , history , programming language
The method and parameters for vacuum hot pressing of single‐crystal germanium, suitable for a large‐area double‐focusing neutron monochromator, are presented. The square virgin crystals have a mosaic that is less than 0.01° and isotropic. After appropriate pressing at high temperature (1073 K at a pressure of 10.7 MPa) the mosaic becomes anisotropic, about 0.5° in one direction and 0.2° in the other. The distribution of the mosaic widths of the crystals in the two directions are given, together with their composite values.