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The crystal structure of LnFeAsO$_{1-y}$ (Ln = La, Nd) has been studied bythe powder neutron diffraction technique. The superconducting phase diagram ofNdFeAsO$_{1-y}$ is established as a function of oxygen content which isdetermined by Rietveld refinement. The small As-Fe bond length suggests that Asand Fe atoms are connected covalently. FeAs$_4$-tetrahedrons transform toward aregular shape with increasing oxygen deficiency. Superconducting transitiontemperatures seem to attain maximum values for regular FeAs$_4$-tetrahedrons.

Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln=La,Nd)