Magnetic frustration effect in polycrystalline Ga2-xFexO3

In Ga2-xFexO3 with the Pc2(1)n orthorhombic structure, owing to the site disorder of Fe ions on the four nonequivalent sites of Fe1, Fe2, Ga1, and Ga2, there exists a significant amount of non-effective Fe ions with no contribution to the ferrimagnetic ordering. These non-effective Fe ions have been found to induce strong frequency dependent suppression of the peak height in the ac susceptibility, demonstrating the frustration effect in the ferrimagnetic ordering background. (C) 2010 Elsevier B.V. All rights reserved.