Pniktogeny: P, As, Sb Chalkogeny: S, Se, Te
1111 122 111 11
LnO(F)FeAs AFe2As2 AFeAs FeTe(Se,S)
Ln = La. Ce. Pr. Nd. Sm. Gd ..
A = Li, Na
A = Ca. Sr Ba, Eu, K
15 K
Tc = 56 K
18 K
47 K