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Condens. Matter 2019, 4(1), 18; https://doi.org/10.3390/condmat4010018

Graphite Optics—Current Opportunities, Properties and Limits

Optigraph GmbH, Rudower Chaussee 29, 12489 Berlin, Germany
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Received: 21 November 2018 / Revised: 11 January 2019 / Accepted: 21 January 2019 / Published: 24 January 2019
(This article belongs to the Special Issue High Precision X-Ray Measurements)
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Abstract

X-ray graphite optics consists of thin layers of Pyrolytic Graphite (PG) attached to a substrate of focusing shape. Pyrolytic Graphite is a perfect artificial graphite obtained by annealing of carbon deposit at temperatures about 3000 °C under deformation. By varying the annealing conditions, one could get PG of different mosaic structure and mechanical properties. A wide variability of the reflecting layer characteristics and optics shape makes the graphite optics useful in an extended range of applications. The optics could be adjusted to applications that require moderate resolution as EDXRF (energy dispersive X-Ray fluorescence) and as well as for high-resolution applications as EXAFS (extended X-ray absorption fine structure), XANES (X-ray absorption near-edge structure) and XES (X-ray emission spectroscopy). To realize the optics with theoretically optimized parameters the relationship between the production procedure and the mosaicity and reflectivity of the optics was experimentally studied. The influence of thickness, the type of PG (Highly Oriented PG (HOPG) or Highly Annealed PG (HAPG)) and substrate characteristics on the optics performance is presented. View Full-Text
Keywords: HOPG; HAPG; Pyrolytic Graphite; von Hamos; mosaic spread; mosaicity; rocking curve HOPG; HAPG; Pyrolytic Graphite; von Hamos; mosaic spread; mosaicity; rocking curve
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Grigorieva, I.; Antonov, A.; Gudi, G. Graphite Optics—Current Opportunities, Properties and Limits. Condens. Matter 2019, 4, 18.

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