1. Energy, Mining and Environment Research Centre, National Research Council Canada, 4250 Wesbrook Mall, Vancouver, British Columbia V6T 1W5, Canada
2. CanmetENERGY in Devon, Natural Resources Canada, One Oil Drive Patch, Devon, Alberta T9G 1A8, Canada
3. Departamento de Física, Universidade Estadual de Maringá, Maringá, PR 87020-900, Brazil