ALLOY NANOPARTICLE, AGGREGATE OF ALLOY NANOPARTICLES, CATALYST, AND METHOD FOR PRODUCING ALLOY NANOPARTICLES

A novel alloy nanoparticle which the alloy nanoparticle contains five or more types of elements, in the case where the alloy nanoparticle is directly supported on a carbon material carrier, the carbon material carrier excludes graphene or carbon fibers; an aggregate of alloy nanoparticles; a catalyst; a production method for alloy nanoparticles.