High energy synchrotron X-ray diffraction study of lead oxide silicate glasses at the Canadian light source

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 626; pp. 144 - 146
• Main Authors: Tse, J.S., Wang, X.D., Jiang, D.T., Chen, N., Jiang, J.Z.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2011
• Subjects: Diffraction; Diffraction patterns; Energy (nuclear); Glass; Glasses; Lead oxides; Light sources; Silicates; Synchrotron; Wiggler; X-ray; X-rays; Glasses; Wiggler; X-ray; Synchrotron
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2010.10.088

The photon energy operational range of the hard X-ray micro-analysis (HXMA) beamline with X-ray produced from a superconductivity wiggler at the Canadian Light Source is extended to 50 keV to investigate the feasibility of performing total diffraction experiments. Diffraction patterns of lead oxide silicate glasses (PbO x SiO 2(1− x) ) x=46, 50 and 61 at% were measured. Structures of the glasses were extracted successfully from Fourier transform of the diffraction patterns. It is shown that the extended q range ( q max=14.2 Å −1) leads to radial distribution functions (RDFs) with sufficient resolution (0.44 Å) to reveal new coordination features. The advantage of high momentum transfer accessible from hard X-ray is clearly demonstrated. Results show that the lead atoms are surrounded by three oxygen and the derived Pb–O–Pb angle ca. 109° supports the existence of –O–(Pb 2O 2)–O units in the glass structure, which illustrates the capability of the new beamline for the investigation of the structure of disordered solids.