-aactivitycapacitycatalytic%20activitycompositioncrystal%20structuredensityhardnessmagneticmagnetic%20propertiesmechanical%20propertiesmetalmetallicmicrostructuremicrostructuresmorphologyparticle%20sizereactivitysaturation%20magnetizationstabilitystructuralstructurestructuressurface%20areachemical%20compositioncompositions