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Unravelling oxygen driven α to β phase transformation in tungsten. | LitMetric

Unravelling oxygen driven α to β phase transformation in tungsten.

Sci Rep

Department of Physics, School of Natural Sciences, Shiv Nadar University, NH-91, Tehsil Dadri, Gautam Buddha Nagar, Uttar Pradesh, 201 314, India.

Published: September 2020

AI Article Synopsis

Article Abstract

Thin films of β-W are the most interesting for manipulating magnetic moments using spin-orbit torques, and a clear understanding of α to β phase transition in W by doping impurity, especially oxygen, is needed. Here we present a combined experimental and theoretical study using grazing incidence X-ray diffraction, photoelectron spectroscopy, electron microscopy, and ab initio calculations to explore atomic structure, bonding, and oxygen content for understanding the formation of β-W. It is found that the W films on SiO/Si have 13-22 at.% oxygen in A15 β structure. Ab initio calculations show higher solution energy of oxygen in β-W, and a tendency to transform locally from α to β phase with increasing oxygen concentration. X-ray absorption spectroscopy also revealed local geometry of oxygen in β-W, in agreement with the simulated one. These results offer an opportunity for a fundamental understanding of the structural transition in α-W and further development of β-W phase for device applications.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7477580PMC
http://dx.doi.org/10.1038/s41598-020-71650-2DOI Listing

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