Sigma-Aldrich
Nickel oxide
Nickel silver alloy, Cu62Ni18Zn20
Nickel silver alloy, Cu64Ni12Zn24
Nickel-beryllium-titanium alloy, Ni97.5Be1.95Ti0.5
Nickel-boron alloy, Ni85B15
Nickel-iron alloy, Ni52Fe48