From Event: SPIE Optical Engineering + Applications, 2017
The Hard X-ray Nanoprobe (HXN) at NSLS-II provides a nanoscale 3D multi-modality imaging capability, useful for investigating diverse material systems. The multi-modality scanning-probe imaging utilizes a variety of imaging contrasts such as fluorescence, transmission, scattering, and diffraction. Images taken simultaneously using different contrast mechanisms can provide 3D visualization of a sample, producing complementary information about the sample. Such comprehensive 3D characterizations are extremely useful in studying materials with multiple phases or complex internal structures. An important scientific problem is to investigate phase or grain boundaries of multi-component materials during or after material processing such as sintering, since re-organization of these boundaries due to annealing or phase-separation often result in profound impact on material property or functionality. However, accurate quantification of 3D elemental concentration is hampered by a well-known self-absorption problem, particularly severe for the low energy fluorescence x-rays. Correcting absorption is non-trivial and requires an iterative and three-dimensional solution. In this presentation, we will describe our approach using experimental data taken from mixed ionic ceramic membrane samples and elaborate on how accurate absorption correction led to discovery of a new material phase in this material system.
Mingyuan Ge, Xiaojing Huang, Hanfei Yan, Evgeny Nazaretski, Li Li, Petr P. Ilinski, Wilson K. S. Chiu, Kyle S. Brinkman, and Yong S. Chu, "Self-absorption correction in x-ray fluorescence nanotomography (Conference Presentation)," Proc. SPIE 10389, X-Ray Nanoimaging: Instruments and Methods III, 103890I (Presented at SPIE Optical Engineering + Applications: August 08, 2017; Published: 19 September 2017); https://doi.org/10.1117/12.2272821.5581194518001.
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