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Determination of miscibility in MgO-ZnO nanocrystal alloys by x-ray absorption spectroscopy
Author(s)
Limpijumnong, Sukit
Jutimoosik, Jaru
Palakawong, Nirawith
Klysubun, Wantana
Du, Mao Hua
Rujirawat, Saroj
Date Issued
December 26, 2011
Type
Article
Abstract
The local structure of Mg xZn 1-xO nanocrystals is studied using synchrotron x-ray absorption near edge structures (XANES) over the full range of composition, from x = 0 to 1. Mg and Zn K-edges XANES measurements allow us to selectively study the local environments around Mg and Zn atoms in these nanocrystalline samples. Our results indicate that, for MgO-ZnO alloys, Zn is highly miscible in the rocksalt domain (i.e., up to ∼50 at.%) while the miscibility of Mg in the wurtzite domain is much less but is still substantial (i.e., up to ∼20 at.%). The simulated XANES spectra, based on first principles methods, are consistent with the observed spectra, confirming our finding. Because it is short-ranged and element-specific, the technique is useful for local structure and crystal phase determination of nanostructures, quantum dots, and mixed-phase alloys in general. © 2011 American Institute of Physics.
Citation
Applied Physics Letters, 99(26), 2011