Effect of antimony substitution in iron pnictide compounds

الأصل · EN

In the present study we have examined the effect of negative chemical pressure in iron pnictides. We have synthesized substitution series replacing arsenic by antimony in a number of 1111- and 122-iron arsenides and present their crystallographic and physical properties. The SDW transition temperature in LaFeAs₁₋ₓSbₓO decreases with increasing antimony content, while the superconducting transition temperature in LaFeAs₁₋ₓSbₓO₀.₈₅F₀.₁₅ initially increases with Sb substitution. 1111-compounds with samarium instead of lanthanum have a smaller unit cell volume. In these phases, no Sb solubility is observed. There is also no apparent solubility of antimony in the 122-iron arsenides.