1. Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 USA
2. Department of Materials Science and Engineering University of Tennessee Knoxville TN 37920 USA
3. Institute for Problems of Materials Science National Academy of Science of Ukraine Krjijanovskogo 3 Kyiv 03142 Ukraine
4. Institute of Physics National Academy of Science of Ukraine pr. Nauki 46 Kyiv 03028 Ukraine