+w 1 36.40 1 36.40.Vz 1 42.25 1 42.25.Bs 1 42.25.Dd 1 61.46 61.46.+w 1 78.20 1 78.20.Ci 1 78.20.−e 1 78.40 1 78.40.−q 1 78.66 1 78.66.Bz 1 78.66.−w 1 78.67 1 78.67.Pt 1 78.70 1 78.70.−g 1 Alumina 1 Aluminum oxide 1 Bs 1 Bz 1 Ci 1 Copper 1 Copper oxides 1 Corrosion protection 1 Dd 1 Electromechanical devices 1