Understanding connections between “structure and function” is a traditional chemical pursuit, and similar correlations are emerging in the field of FeAs superconductors. A correlation between the a -axis lattice constant and Tc has been noted in both LnFeAsO-based (Ln = lanthanide element) and perovskite-based FeAs superconductors (P. M. Shirage, K. Kikou, C.-H. Lee, H. Kito, H. Eisaki, A. Iyo, J. Am. Chem. Soc. , 2011 , 133 , 9630). For LnFeAsO-based materials, what is the optimum a -axis lattice constant that results in the highest Tc ? How do the Tc values vary on the basis of the identity of Ln? Do these Tc values exhibit a periodic trend? Explain. For perovskite-based (As) materials, what is the predicted a -axis lattice constant upper limit above which superconductivity would not be expected at any temperature?
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