YB sub 66 : A new soft x-ray monochromator for synchrotron radiation

Conference · Sun Oct 01 04:00:00 EDT 1989

OSTI ID:5437227

Wong, J.; Shimkaveg, G.; Goldstein, W.; Eckart, M.; Tanaka, T.; Rek, Z. U.; Tompkins, H. ^[1]

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1. Lawrence Livermore National Lab., CA (USA)

YB{sub 66}, a complex binary semiconducting compound, cubic in crystal structure with a cell parameter of 23.44 {Angstrom}, has been singled out as a potentially useful soft x-ray monochromator for dispersing synchrotron radiation. There is no intrinsic absorption by the constituent elements in the region 1-2 keV (the Y L{sub 3}-edge is at 2080 eV). Using the known structure factors for the (400) and (222) reflections having 2d values of 11.76 {Angstrom} and 13.53 {Angstrom} respectively, their rocking curves have been calculated and are shown to be comparable to or better than that of beryl (1010). In terms of vacuum compatibility, resistance to radiation damage, thermal and mechanical stability, YB{sub 66} satisfies all the material requirements for use as a monochromator for synchrotron radiation in the soft x-ray region. Recent experiments in growing single crystals of this material large enough to intercept 1 mrad of radiation are discussed. Rocking curve measurements, etch pit density, and x-ray white beam topography are used to characterize the quality of these large crystals as a function of some critical growth parameters such as pulling rate and thermal gradient at the crystal-liquid interface. From this study, it is clear that future work should be directed toward the control and retention of convexity of the crystal-liquid interface during growth, a key factor to achieve high perfection crystals. 12 refs., 9 figs., 1 tab.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5437227
• Report Number(s): UCRL-102155; CONF-890802--17; ON: DE90003621
• Country of Publication: United States
• Language: English

Related Subjects

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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
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99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALKALINE EARTH METAL COMPOUNDS
B CODES
BERYL
BERYLLIUM COMPOUNDS
BERYLLIUM SILICATES
BORIDES
BORON COMPOUNDS
BREMSSTRAHLUNG
COMPUTER CODES
CRYSTAL GROWTH METHODS
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
MINERALS
MONOCHROMATORS
OXYGEN COMPOUNDS
RADIATIONS
RARE EARTH COMPOUNDS
RESEARCH PROGRAMS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SOFT X RADIATION
SYNCHROTRON RADIATION
X RADIATION
YTTERBIUM BORIDES
YTTERBIUM COMPOUNDS