Designing Protocols for Synthesis of Superconduting LiFeAs Nanostructures through Sacrificial Template Method
The recent discovery of superconductivity in the iron pnictide based compounds like LnFeAsO (Ln = La, Ce, Sm, Gd, Dy), AFeAs (A = Li, Na) and AFe2As2 (A = Ba, Ca) has put them under immense scrutiny. the unconventional nature of superconductivity along with high critical field, moderately high critical temperatures and critical current density make them attractive for superconducting applications. the iron pnictide layer is believed to be responsible for charge reservoir and manifestation of superconductivity in these compounds. the cations (e.g. Li, Na, Ba, Ca etc.) or the cationic layer (Ln2O3) is alternately stacked between the anionic FeAs layers. We are attempting to synthesize superconducting nanostructures of these newest superconductors through the sacrificial template approach where FeAs nanostructures are used as morphology directing agents. in our research, we have developed a one-pot soft chemical method to synthesize monodisperse FeAs@C core- shell nanoparticles. Interestingly these FeAs nanoparticles showed superparamagnetism with a fairly high TB-. Conversion of these superparamagnetic FeAs nanoparticles to superconducting nanostructures are being attempted through reductive ion intercalation, whereby, Li ions are intercalated into the FeAs nanoparticles through galvanostatic insertion. Alternatively, in situ formation of LiFeAs has also been explored by solvothermal method for formation of LiFeAs nanostructures in bulk quantities. Preliminary results regarding synthesis of LiFeAs nanostructures through these routes will be discussed along with the effect of morphology on the superconducting TC.
P. Sood and M. Nath, "Designing Protocols for Synthesis of Superconduting LiFeAs Nanostructures through Sacrificial Template Method," American Chemical Society (ACS), Jan 2013.
245th ACS National Meeting and Exposition (2013, New Orleans, Louisiana)
Article - Conference proceedings
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