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US 11,060,167 B2Granted
Layered FeAs, method of preparing same, and FeAs nanosheet exfoliated from same
AssigneesIndustry-Academic Cooperation Foundation, Yonsei University, Korea Institute of Science and Technology
InventorsWoo Young Shim, Dong Won Chun, Hyesoo Kim, Jong Bum Won
Life of this patent
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Abstract
The present invention relates to: layered iron arsenide (FeAs), which is more particularly layered FeAs, which, unlike the conventional bulk FeAs, has a two-dimensional (2D) crystal structure, has the ability to be easily exfoliated into nanosheets, and has superconductivity; a method of preparing the same; and a FeAs nanosheet exfoliated from the same.
Claims6
A method of preparing layered FeAs, the method comprising:
- step (1) of heat-treating a mixture including Li or Ca powder, Fe powder, and As powder and cooling the mixture, thereby obtaining a layered compound that has a tetragonal crystal structure with the P4/nmm space group and is represented by the chemical formula LiFeAs or has a tetragonal crystal structure with the I4/mmm space group and is represented by the chemical formula CaFe2As2;
- and
- step (2) of selectively removing Li ions or Ca ions contained in the layered compound without disrupting the crystal structure of the layered compound, thereby obtaining layered FeAs.
Dependencies are inferred from the claim text.