Short report
Methodology for synthesis of 12442 family iron-based stoichiometric superconductors: KCa2Fe4As4F2, RbCa2Fe4As4F2, CsCa2Fe4As4F2
A. A. Gippius
Р.N. Lebedev Physical Institute of the Russian Academy of Sciences, Leninsky Prospekt, 53, 119991, Moscow, Russia
V. A. Vlasenko
Р.N. Lebedev Physical Institute of the Russian Academy of Sciences, Leninsky Prospekt, 53, 119991, Moscow, Russia
A. I. Shilov
Р.N. Lebedev Physical Institute of the Russian Academy of Sciences, Leninsky Prospekt, 53, 119991, Moscow, Russia
S. Yu. Gavrilkin
Р.N. Lebedev Physical Institute of the Russian Academy of Sciences, Leninsky Prospekt, 53, 119991, Moscow, Russia
K. S. Pervakov
Р.N. Lebedev Physical Institute of the Russian Academy of Sciences, Leninsky Prospekt, 53, 119991, Moscow, Russia
e-mail: pervakovks@lebedev.ru
Abstract
The paper describes a method of synthesis of polycrystalline samples of iron-based stoichiometric high-temperature superconductors of the 12442 family: KCa2Fe4As4F2, RbCa2Fe4As4F2 and CsCa2Fe4As4F2, by mechanical alloying using a cryomill. The described technique allows to obtain polycrystalline samples with impurities content not more than 1 wt.% due to optimization of milling time and temperature profile, and the use of mechanical alloying allows to reduce the synthesis time significantly.
Keywords: superconductivity; high temperature superconductivity; iron-based superconductors; mechanical alloying; pnictide; 12442-family.
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