1. ABOUT THE DATASET
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Title:	Elemental tomography dataset of Mg-Al-Ca alloy

Creator(s): Jessica E. Snelson [1], Sean M. Collins [1,2], Katherine MacArthur [3]

Organisation(s): 1. University of Leeds, 2. Imperial College London, 3. Oxford Instruments

Rights-holder(s): Copyright 2026 University of Leeds

Publication Year: 2026

Description: Data used for absorption correction of Mg-Al-Ca needle alloy, including ADF-STEM and elemental EDS tilt series for the Mg-Al-Ca needle, stacked ADF tilt series and EDS data of the CaCO3 and MgO calibration standards, and EELS spectrum image/ADF image/relative thickness and EDS data for the Al wedge calibration standard. Combination of raw data collected from the microscope with some pre-processed data (ADF tilt series data stacked in order). Metadata collected At Forschungszentrum Jülich on an FEI Titan G2 80-200 at 200kV.

Cite as: Snelson, Jessica E.; Collins, Sean M. and MacArthur, Katherine (2026) Elemental tomography dataset of Mg-Al-Ca alloy. University of Leeds. [Dataset] https://doi.org/10.5518/1826.  
 
Related publication: Snelson, Jessica E.; Yuan, Jillian; Collins, Sean M.; MacArthur, Katherine. Composition fluctuations at interfaces in Mg-Al-Ca alloys revealed by quantitative three-dimensional X-ray energy dispersive spectroscopy, Ultramicroscopy, 2026, 114354. https://doi.org/10.1016/j.ultramic.2026.114354. 

2. TERMS OF USE
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Copyright 2026 University of Leeds, Imperial College London. This dataset is licensed under a Creative Commons Attribution 4.0 International Licence: https://creativecommons.org/licenses/by/4.0/.


3. PROJECT AND FUNDING INFORMATION
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Title: Composition fluctuations at interfaces in Mg-Al-Ca alloys revealed by quantitative three-dimensional X-ray energy dispersive spectroscopy

Dates: 2019-2026

Funding organisation: EPSRC

Grant no.: JES acknowledges the support of an Engineering and Physical Sciences Research Council (EPSRC) PhD studentship (2596546). SMC acknowledges support from the EPSRC (EP/V044907/1) and UK Research and Innovation (EP/Y024583/1, project AMICI selected by the European Research Council and funded by UKRI).


4. CONTENTS
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File listing

Folder: Al_Wedge_Standard
    Files: Al_ADF_Image.dm4: ADF image of Al wedge calibration standard
           Al_EDS-HAADF.emd: EDS-HAADF data of Al wedge calibration standard
           Al_EELS_Spectrum_Image.dm4: EELS spectrum image of Al wedge calibraiton standard
           Al_Relative_thickness.dm4: Relative thickness of Al wedge calibration standard
Folder: CaCO3_Standard
    Files: CaCO3_EDS-HAADF.emd: EDS_HAADF data of Ca (CaCO3) calibration standard
           CaCO3_HAADF_TiltSeries_Stack.hdf5: Stacked HAADF tilt series of Ca (CaCO3) calibration standard - in order from negative to positive tilt, not aligned
Folder: MgO_Standard
    Files: MgO_EDS-HAADF.emd: EDS_HAADF data of Mg (MgO) calibration standard
           MgO_HAADF_TiltSeries_Stack.hdf5: Stacked HAADF tilt series of Mg (MgO) calibration standard - in order from negative to positive tilt, not aligned
.emd, .hdf5 and .dm4 files processed on Python using the HyperSpy package.
Folder: Needle_Sample
    Files: EDS_Tomography_SpectrumImageTiltSeries.zip - contains .hspy files (HyperSpy .hdf5 variant)
           EDS_TiltSeries_ADF-STEM.zip - contains .tif files
           EDS_TiltSeries_ElementalMaps.zip - contains .tif files

5. METHODS
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Full method found in paper listed in section 1 (Snelson, Ultramicroscopy, 2026)
Creation of sample and data: Katherine MacArthur
Processing of data: Jessica E. Snelson, Sean M. Collins, Jillian Yuan and Katherine MacArthur