Local structure order around Ni in Hf-Cu-Ni glassy ribbons: XANES and EXAFS study at Ni K-edge

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dc.contributor.author Deshmukh, Akash A.
dc.contributor.author Khond, Anuj A.
dc.contributor.author Bhatt, Jatin G.
dc.contributor.author Palikundwar, Umesh A.
dc.coverage.spatial United States of America
dc.date.accessioned 2022-02-16T08:48:06Z
dc.date.available 2022-02-16T08:48:06Z
dc.date.issued 2022-04
dc.identifier.citation Deshmukh, Akash A.; Khond, Anuj A.; Bhatt, Jatin G. and Palikundwar, Umesh A., "Local structure order around Ni in Hf-Cu-Ni glassy ribbons: XANES and EXAFS study at Ni K-edge", Physica B: Condensed Matter, DOI: 10.1016/j.physb.2022.413687, vol. 630, Apr. 2022. en_US
dc.identifier.issn 0921-4526
dc.identifier.uri https://doi.org/10.1016/j.physb.2022.413687
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/7524
dc.description.abstract This work has investigated the formation of the local structure order around Ni in Hf-Cu-Ni glassy ribbons by employing X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopy at Ni K-edge. XANES probed 1s to 4p transition at the shoulder of the spectra. The main peak of the spectra corresponds to the 1s to 4p dipole selection rule. The magnitude of the first peak of the EXAFS signal, belonging to the first coordination shell of Ni, decreased with an increase in Ni concentration. The coordination number (CN) of Ni/Cu atoms increases, whereas that of Hf atoms decreases with increasing Ni concentration. The first peak of Hf57Cu11Ni32 (Hf57), Hf59Cu18Ni23 (Hf59), and Hf60Cu21Ni19 (Hf60) is dominated by Ni-Ni and Ni-Cu pair. A nearly linear decrease in atomic distances of Ni-Hf pair is observed with an increase in CN of Ni/Cu, thereby indicating atomic re-arrangement around the central absorbing atom. Hf57 with large CN of Ni/Cu atoms has shown the most negative PHs (product of enthalpy of chemical mixing and normalized mismatch entropy) and large supercooled liquid region. This work reflects that the CN of an element strongly influences the glass formation ability of an alloy.
dc.description.statementofresponsibility by Akash A. Deshmukh, Anuj A. Khond, Jatin G. Bhatt and Umesh A. Palikundwar
dc.format.extent vol. 630
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.subject EXAFS en_US
dc.subject XANES en_US
dc.subject Ni K?Edge en_US
dc.subject Hf?rich glassy ribbons en_US
dc.subject Coordination number (CN) en_US
dc.subject Glass formation ability (GFA) en_US
dc.title Local structure order around Ni in Hf-Cu-Ni glassy ribbons: XANES and EXAFS study at Ni K-edge en_US
dc.type Article en_US
dc.relation.journal Physica B: Condensed Matter

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