Black powder, density 6.88 g / cm3, melting point 2042 ℃, boiling point 3760 ℃. Insoluble in water, soluble in acid generate trivalent salts. Good electrical conductivity. For construction ceramics and ceramics for daily use, which blend with the ceramic enamel glaze, also available separately for underglaze pigments, pigment made of light yellow, pure tone, elegant; for the manufacture of permanent magnets. Selection of inexpensive neodymium praseodymium neodymium metal instead of pure metal magnetic materials, its antioxidant properties and mechanical performance has improved significantly, it can be processed into a variety of shapes magnet. Widely used in various types of electronic devices and motor; for petroleum cracking. Pr-Nd enrichment in the form of added oil cracking catalyst Y Zeolite, it can increase the activity, selectivity and stability of the catalyst; for abrasive polishing; also for fiber optic fields.