EPR in Physics

Determination of Mg coordination in wurtzite thin films
The transition-group, rare-earth and actinide ions are members of the 3d, 4d, 5d, 4f and 5f groups and are subject of a host of EPR investigations. One aspect that makes transition elements interesting subjects for study by EPR is their variable valence. For example, Zn1xMgxO complex is a versatile functional material for oxide semiconductors and the atomic arrangement in the bulk and at the interfaces determines important properties of the oxides. EPR is used to determine the Mg coordination in heteroepitaxial wurtzite Zn1xMgxO:Mn thin films.

Experimental and simulated EPR spectra at 297 K of Zn_0.99Mg_0.01O:Mn (p_O2 = 0.016 mbar, c_Mn = 0.05%) thin film sample G5189 for B┴c (top) and BIIc (bottom). Asterisks indicate signals of Fe³⁺ and Cr³⁺ impurities in the sapphire substrate.