Iron cobalt ternary alloy nanoparticles with silica shells and metal silicate interface

A core-shell nanoparticle, comprising:

• a core of an iron cobalt ternary alloy;
• a shell of a silicon oxide coating the core;
• and
• a metal silicate interface in a region between the core and the shell;
• wherein
• the third component of the ternary alloy is a transition metal selected from the group consisting of scandium, titanium, vanadium, chromium, manganese, nickel, copper and zinc,
• a particle size of the nanoparticle is from 2 to 200 nm, and
• the metal silicate of the metal silicate interface comprises at least one of iron silicate, cobalt silicate and the third component transition metal silicate.