1. i3N Department of Physics University of Aveiro Campus Universitário de Santiago Aveiro 3810‐193 Portugal
2. i3N/CENIMAT Department of Materials Science and CEMOP/UNINOVA NOVA School of Science and Technology NOVA University Lisbon Campus de Caparica Caparica 2829‐516 Portugal
3. CICECO – Aveiro Institute of Materials Department of Physics University of Aveiro Campus Universitário de Santiago Aveiro 3810‐193 Portugal
4. CICECO – Aveiro Institute of Materials Department of Materials and Ceramic Engineering University of Aveiro Campus Universitário de Santiago Aveiro 3810‐193 Portugal