1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation & School of Materials Science and Engineering; Southwest Petroleum University; Chengdu 610500 People's Republic of China
2. Department of Materials Engineering, CeRTEV-Center for Research, Technology and Education in Vitreous Materials; Federal University of São Carlos; São Carlos SP 13565-905 Brazil
3. Institut für Physik; Universität Rostock, Albert-Einstein-Str. 23-24; Rostock 18051 Deutschland