Name: dysprosium oxide, Dysprosium Oxide, CAS No. 1308-87-8. Physical and Chemical Properties: Molecular weight 373, as a white powder or light yellow powder, density 7.81 (27 ℃), melting point 2340 ℃, boiling point of about 4000 ℃, dissolved with acid and ethanol. However, alkali-insoluble, is insoluble in water. By thermal decomposition of dysprosium hydroxide made of high heat of formation, exposed in the air will absorb carbon dioxide becomes part of dysprosium. Application: dysprosium present in many high-tech fields are playing an increasingly important role, the main dysprosium purposes: (1) as an additive NdFeB permanent magnets used in this magnet to add about 2 to 3% dysprosium, can increase the coercive force, in the past little demand dysprosium, but with increasing demand for NdFeB magnets, it should become necessary to add elements, quality must be about 95 to 99.9%, demand is also increasing rapidly . (2) as a phosphor activator dysprosium, dysprosium (III) is a promising single tricolor light emission center material of active ionic species, it is mainly composed of the two emission bands, one for yellow light emission and the other is blue emission, light-emitting materials can be doped with dysprosium as trichromatic phosphor. (3) Dysprosium is preparing large magnetostrictive alloy Tb Dy Fe (Terfenol) alloy metals necessary, make some of precision mechanical movement activities can be achieved. (4) used as a magneto-optical storage dysprosium metal materials with a higher recording speed and reading sensitivity. (5) for the preparation of dysprosium lamps, dysprosium lamp used in the working substance is dysprosium iodide, this lamp has a brightness, good color, high color temperature, small size, stable arc, etc., have been used for the film, printing such as lighting. (6) Since dysprosium element has a neutron capture cross-sectional area of ??the great features in the nuclear industry used to determine the neutron spectrum or doing neutron absorber. (7) Dy3Al5O12 also be used as a magnetic working material magnetic refrigeration. With the development of science and technology, dysprosium applications will continue to expand and extend.