@article{9cd721caead347fb87db6d9294e9932b,
title = "Differentiating the bonding states in calcium carbonate polymorphs by low-loss electron-energy-loss spectroscopy",
abstract = "Calcium carbonate is one of the important building components in organisms, especially the two most common polymorphs, calcite and aragonite. Here, to understand the difference in bonding state, the two polymorphs are characterized by valence (low-loss) electron energy loss spectroscopy. It is found that the difference in Ca M23 edge originating from 3p to 3d states is consistent with the change of Ca-O bonds in the two studied polymorphs. Surprisingly, the measured Ca M23 edge is in qualitative agreement with the calculated partial density of states (PDOS) of Ca-d states in contrast to their L edges (from 2p to 3d states) which are strongly influenced by atomic multiplet effect (spin-orbit coupling). This is because the atomic multiplet effect is much reduced for the Ca 3p orbital, which permits the corresponding Ca M23 edge to be compared with the PDOS results. Our findings show insights that PDOS can potentially be used to interpret the M23 edge of lighter 3d transition metals such as scandium, titanium, vanadium and chromium when such interpretation may not be achieved for their L edges.",
keywords = "Aragonite, Bonding state, Calcite, Calcium carbonate, DFT, EELS",
author = "Yeh, {Yao Wen} and Sobhit Singh and Guangming Cheng and Nan Yao and Rabe, {Karin M.} and David Vanderbilt and Batson, {Philip E.} and Long Pan and Guofeng Xu and Shiyou Xu",
note = "Funding Information: We thank H. Yang and M. Hoffman for discussions regarding the optical configuration of the microscope. First-principles calculations were performed using the computational resources provided by the Rutgers University Parallel Computing clusters. This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences under awards DE-SC0020353 (S. Singh) and DE-SC0005132 (P. Batson). S.S. and K.M.R. acknowledge the support from the Office of Naval Research (ONR) grant N00014-21-1-2107. D.V. acknowledges the support from National Science Foundation grant DMR-1954856. The authors acknowledge the use of Princeton's Imaging and Analysis Center, which is partially supported by the Princeton Center for Complex Materials, a National Science Foundation (NSF)-MRSEC program (DMR-2011750). Funding Information: We thank H. Yang and M. Hoffman for discussions regarding the optical configuration of the microscope. First-principles calculations were performed using the computational resources provided by the Rutgers University Parallel Computing clusters. This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences under awards DE-SC0020353 (S. Singh) and DE-SC0005132 (P. Batson). S.S. and K.M.R. acknowledge the support from the Office of Naval Research (ONR) grant N00014-21-1-2107. D.V. acknowledges the support from National Science Foundation grant DMR-1954856. The authors acknowledge the use of Princeton's Imaging and Analysis Center, which is partially supported by the Princeton Center for Complex Materials, a National Science Foundation (NSF)-MRSEC program (DMR-2011750). Publisher Copyright: {\textcopyright} 2023 Acta Materialia Inc.",
year = "2023",
month = sep,
day = "15",
doi = "10.1016/j.actamat.2023.119191",
language = "English (US)",
volume = "257",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier Limited",
}