Alexander J. Shapiro, Robert D. Shull, N Gorshkov, Michael R. Zachariah
The potential use of magnetic nanoparticles as a very efficient refrigerant for magnetic refrigerators at temperatures well above 4.2 K was recently suggested [1,2]. Suitable for this purpose NaCl-coated iron nanoparticles were synthesized in a sodium flame co-flow (Cl2 in Ar) reactor. This process allows the production of sufficient quantities of unoxidized, high-purity iron nanoparticles enveloped in sodium halides. The composite powder was investigated by means of Mossbauer spectroscopy, magnetization measurements, transmission electron microscopy, and scanning electron microscopy show that the material is composed of 30-60 nm (on average) unoxidized Fe particles embedded in NaCl.
magnetic nanoparticles, magnetic refrigeration, magnetization, Mossbauer, refrigerant, scanning electron microscopy
, Shull, R.
, Gorshkov, N.
and Zachariah, M.
Mossbauer Study of NaCl-Coated Fe Nanoparticles, Hyperfine Interactions
(Accessed November 30, 2023)