A Hybrid Angular/Energy Dispersive Method to Improve Some Characteristics of Laboratory X-Ray Diffraction

V. Rossi Albertini, D. Bailo, A. Generosi, B. Paci

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DOI: 10.4236/mi.2012.11001                

Abstract

The Energy Dispersive X-ray Diffraction, generally referred as EDXD, has shown to be a valid alternative to the conventional Angular Dispersive X-ray Diffraction, the ADXD. EDXD exhibits several advantages to its AD counterpart, mainly related to the properties of the polychromatic X-ray beam utilized for diffracting, such as higher signal intensities, a wider accessible region of the reciprocal space, a greater transparency of samples, and a parallel data collection of the q-points in the diffraction pattern acquisition. However, the main drawback of poly-chromaticity lays in the fact that the quantities that modulate the scattered intensity in a diffraction measurement depend on the energy. These quantities are the primary X-ray beam spectrum, polarization, and X-ray absorption, the last producing by far the most critical effect because it rapidly changes as a function of energy. Therefore, a detailed knowledge of the energy dependence of all these quantities is required in EDXD in order to process the data correctly and prevent systematic errors. The difficulty in handling the energy-dependent factors complicates the experimental procedure and may make the measurements unreliable. In the present paper, a hybrid method between the ED and AD X-ray Diffraction is proposed to maintain the advantages of the polychromatic nature of the radiation utilized in EDXD, while preventing the problems produced by the energy-dependent quantities.

Keywords

X-Ray Diffraction; Energy Dispersive; Angular Dispersive

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	J. M. Prober and J. Schultz, “Liquid-Structure Analysis by Energy-Scanning X-Ray Diffraction: Mercury,” Journal of Applied Crystallography, Vol. 8, Part 4, 1975, pp. 405-414. doi:10.1107/S0021889875010898
[2]	M. Carbone, R. Caminiti and C. Sadun, “Structural Study by Energy Dispersive X-Ray Diffraction of Amorphous Mixed Hydroxycarbonates Containing Co, Cu, Zn, Al,” Journal of Materials Chemistry, Vol. 6, No. 10, 1996, pp. 1709-1716. doi:10.1039/jm9960601709
[3]	V. Rossi Albertini, B. Paci and A. Generosi, “The Energy Dispersive X-ray Reflectometry as a Unique Laboratory Tool to Investigate Morphological Properties of Layered Systems and Devices,” Journal of Physics D: Applied Physics, Vol. 39, 2006, pp. 461-486. doi:10.1088/0022-3727/39/23/R01
[4]	R. Caminiti and V. Rossi Albertini, “The Kinetics of Phase Transitions Observed by Energy-Dispersive X-Ray Diffraction,” International Reviews in Physical Chemistry, Vol. 18, No. 2, 1999, pp. 263-299. doi:10.1080/014423599229965
[5]	D. Reidel, “International Tables for X-Ray Crystallography,” Edited for the International Union of Crystallography, 4th Edition, Dordrecht, London, 1983.
[6]	Y. Murata and K. Nishikawa, “The Construction of an Energy-Dispersive X-Ray Diffractometer for Liquids and Its Application to CCl4,” Bulletin of the Chemical Society of Japan, Vol. 51, No. 2, 1978, pp. 411-418. doi:10.1246/bcsj.51.411
[7]	K. Nishikawa and T. Iijima, “Corrections for Intensity Data in Energy-dispersive X-Ray Diffractometry of Liquids. Application to Carbon Tetrachloride,” Bulletin of the Chemical Society of Japan, Vol. 57, No. 7, 1984, pp. 1750-1759. doi:10.1246/bcsj.57.1750
[8]	B. C. Giessen and G. E. Gordon, “X-Ray Diffraction: New High-Speed Technique Based on X-Ray Spectrography,” Science, Vol. 159, No. 3818, 1968, pp. 973-975. doi:10.1126/science.159.3818.973-a
[9]	T. Egami, “Glassy Metals I,” Springer Verlag, Berlin, 1981.
[10]	T. Iijima, “Stereochemical Applications of Gas-phase Electron Diffraction,” Publisher VCH, Budapest, 1987.
[11]	C. D. Hanson and T. Egami, “Distribution of Cs+ Ions in Single and Mixed Alkali Silicate Glasses From Energy Dispersive X-Ray Diffraction,” Journal of Non-Crystalline Solids, Vol. 87, No. 1-2, 1986, pp. 171-184. doi:10.1016/S0022-3093(86)80077-1
[12]	S. Hosokawa, T. Matsuoka and K. Tamura, “X-Ray Diffraction Measurements for Expanded Liquid Mercury in the Metallic Region,” Journal of Physics: Condensed Matter, Vol. 3, No. 24, 1991, pp. 4443-4457. doi:10.1088/0953-8984/3/24/014
[13]	U. Bafile, F. Barocchi, F. Cilloco, K. Hochgesand, R. Winter and H. E. Fischer, “The Microscopic Structure of Liquid Mercury from Neutron and X-Ray Diffraction,” Physica B, Vol. 276, 2000, pp. 452-453. doi:10.1016/S0921-4526(99)01671-3
[14]	G. Caglioti, A. Paoletti and F.P. Ricci, “Choice of Collimators for Crystal Spectrometers for Neutron Diffraction,” Nuclear Instruments and Methods, Vol. 3, No. 4, 1958, pp. 223-228. doi:10.1016/0369-643X(58)90029-X