[1] Univ Aveiro, Dept Mat & Ceram Engn, Aveiro, Portugal
[2] Univ Aveiro, CICECO Ctr Invest Ceram & Composites, Aveiro, Portugal
[3] Univ Aveiro, Funct Imaging & Nanocharacterizat Lab, Ctr Res Ceram & Composite Mat, Aveiro, Portugal
[4] Univ Minho, Dept Phys, P-4719 Braga, Portugal