It has hygroscopicity, easily absorb moisture, can rapidly absorb moisture and carbon dioxide from the air, should be sealed in a container, soluble in mineral acids to form salts, insoluble in water, and have irritation.

Application: Mainly used in the manufacture of cameras, microscopes, electronic ceramics industry, as well as catalyst preparation.

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It is mainly used in the manufacture of the special alloy precision optical glass, high dipodic beaverboard, suitable for camera, camera, microscope lens and advanced optical instruments prisms, etc. Also used in the manufacture of ceramic capacitor, piezoelectric ceramic mixing agent and X-ray emitting materials bromine lanthanide oxide powder, etc.