Phase Formation of Iron-Based Superconductors during Mechanical Alloying

Vladimir A Vlasenko; Alena Yu Degtyarenko; Andrei I Shilov; Alexey Yu Tsvetkov; Lyudmila F Kulikova; Alexey S Medvedev; Kirill S Pervakov

doi:10.3390/ma15238438

Phase Formation of Iron-Based Superconductors during Mechanical Alloying

Materials (Basel). 2022 Nov 27;15(23):8438. doi: 10.3390/ma15238438.

Authors

Vladimir A Vlasenko¹, Alena Yu Degtyarenko¹, Andrei I Shilov¹, Alexey Yu Tsvetkov¹, Lyudmila F Kulikova², Alexey S Medvedev¹, Kirill S Pervakov¹

Affiliations

¹ V.L. Ginzburg Centre for High-Temperature Superconductivity and Quantum Materials, P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 53, Leninsky Ave., 119991 Moscow, Russia.
² L.F. Vereshchagin Institute for High Pressure Physics of the Russian Academy of Sciences, 14, Kaluzhskoe Highway, 108840 Moscow, Russia.

Abstract

We successfully synthesized bulk Ba_0.6Na_0.4Fe₂As₂ and Sr_0.5Na_0.5Fe₂As₂ compounds by high-energy mechanical alloying (MA) technique. The MA process results in homogeneous amorphous phases of BaFe₂As₂ and SrFe₂As₂. It was found that the optimum time for high-energy milling in all cases is about 1.5-2 h, and the maximum amount of amorphous phase could be obtained when energy of 50-100 MJ/kg was absorbed by the powder. After a short-term heat treatment, we obtained nearly optimum sodium-doped Ba_1-xNa_xFe₂As₂ and Sr_1-xNa_xFe₂As₂ superconducting bulk samples. Therefore, MA is a potential scalable method to produce bulk superconducting material for industrial needs.

Keywords: 122; IBS; bulk synthesis; iron-based superconductors; mechanical alloying.

Grants and funding

21-52-12043/Russian Foundation for Basic Research