Determination of miscibility in MgO-ZnO nanocrystal alloys by x-ray absorption spectroscopy

作者：Limpijumnong Sukit; Jutimoosik Jaru; Palakawong Nirawith; Klysubun Wantana; Nukeaw Jiti; Du Mao Hua; Rujirawat Saroj^*

来源：Applied Physics Letters, 2011, 99(26): 261901.

DOI：10.1063/1.3671987

The local structure of MgxZn1-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 similar to 50 at. %) while the miscibility of Mg in the wurtzite domain is much less but is still substantial (i.e., up to similar 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.

• 出版日期2011-12-26