LiFeAs Pnictide Superconductor – a Simple Electrochemical Method of Preparation
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Citation:Published version: IEEE Transactions on Applied Superconductivity (Volume: 23, Issue: 3, June 2013) Article Sequence Number: 7300204. https://doi.org/10.1109/TASC.2012.2232953
Unlike the known isoelectronic undoped intrinsic FeAs compounds, LiFeAs does not show any spin-density wave behavior but exhibits superconductivity at ambient pressures without chemical doping. It has a superconducting transition temperature, Tc , of 18 K with electron-like carriers and a very high 0 K upper critical magnetic field, Bc2(0), of greater than 80 T making the compound suitable for many high magnetic field applications at cryogenic temperatures. Oxypnictide materials are known for a complexity of their methods of preparation. The reported methods of LiFeAs preparation are based on the solid-state reaction at high temperatures (740-1050 oC) for long times (24 – 60 hours). In the present work a simple electrochemical route is proposed for the preparation of a pnictide LiFeAs superconductor. During electrolysis Li ions in the electrolyte become inserted into the FeAs lattice to form LiFeAs on the surface of the FeAs electrode. The proposed method differs from the existing electrochemical method and also from the traditional high temperature solid-state reaction methods. It is promising for the preparation of LiFeAs bulks and large scale LiFeAs films or tapes for various electric power
A successful preparation of LiFeAs film using a simple electrochemical method has been presented. The method issimple and easy to employ. Unlike the previous procedure  it does not need a Li anode and it works in open air, which makes it suitable for practical applications. Given the fact that Bc2 of this material is about 80 T at 4.2 K makes it attractive for high magnetic field applications. A further improvement of the method is possible . The work is in progress.
The research has been supported by the Slovak Agency for Research and Development (APPV) (Grant No. 0423-11) and by the Scientific Grant Agency (VEGA) of the Ministry of Education of the Slovak Republic and the Slovak Academy of Sciences, Grant No. 1/1222/12.