1. Universidade do Minho, Centro de Física, Campus de Gualtar, 4710-057 Braga, Portugal
2. University of Aveiro, Department of Mechanical Engineering and TEMA, 3810-193 Aveiro, Portugal
3. CEMDRX, Departamento de Física, Universidade de Coimbra, 3004-516 Coimbra, Portugal
4. Department of Ceramics and Glass Engineering & Center for Research in Ceramic and Composite Materias (CICECO), University of Aveiro, 3810-193 Aveiro, Portugal