Nano Fe3O4,the chemical formula is Fe3O4.Usually called black iron oxide,magnetite and black iron oxide,it is a black crystal with magnetism,so it is also called magnetic iron oxide.
Cuprous oxide is a bright red powder that is almost insoluble in water.It is decomposed into divalent copper and copper in acid solutions,and gradually oxidized into black copper oxide in humid air.
Spherical silicon powder not only has good shape, but also has high chemical purity and low content of radioactive elements, which can meet the technical requirements of high-end integrated circuits.