Terbium is a member of the lanthanide series, atomic number 65, periodic group III (class) subgroup, lanthanide element, soft and malleable silver-white metal, easy to be corroded by air at high temperature; very corrosive at room temperature slow. It is soluble in acid and colorless in salts. The oxide Tb4O7 is brown. , Element symbol Tb, belongs to rare earth metal, toxic. There is only one stable isotope in nature, and there are 20 other radioactive isotopes. The hexagonal crystal lattice is soluble in dilute acid and reacts slowly with water. Has high reactivity. It should be stored in a container filled with inert gas or a vacuum container.
Its compounds can be used as insecticides and also used to treat skin diseases. The preciousness of terbium and its many excellent characteristics make it in an irreplaceable position in some application fields. It is widely used in agriculture, industry, animal husbandry, medicine and health, high-tech industries and other fields
Medical treatment: X-ray photography used to diagnose human bones and lungs must use terbium. In order to improve the sensitivity of X-ray film, a sensitizer that can emit fluorescence when exposed to X-rays is needed. Tb3+ is used in the sensitizer Gd2O2S, which improves the sensitivity of the film.
Magnetic deflection: The material stretches in the direction of magnetization, that is, the change in size is called magnetic deflection, also called magnetic distortion. Terbium-iron and terbium-dysprosium-iron have a large magnetic deflection effect and are used in the print head of computer printers and precision processing equipment. The secret lies in the shape of the flat 4f electron cloud of terbium, and after applying a magnetic field, in order to move the electrons, it relies on the movement of surrounding atoms that correspond to it.
Activator: Phosphors are used as the activator of the green powder in the three primary color phosphors, such as terbium-activated phosphate matrix, terbium-activated silicate matrix, terbium-activated cerium-magnesium aluminate matrix, all in the excited state Glows green light.
Optical disk: As a computer recording medium, the optical disk uses a heavy rare earth element-transition metal element series alloy represented by a terbium-iron-cobalt alloy. During laser irradiation, information is written and read using changes in reflected light magnetized by the surface.
Magneto-optical storage materials and terbium-based magneto-optical materials have reached the scale of mass production. Magneto-optical optical discs developed with Tb-Fe amorphous thin films are used as computer storage elements, and the storage capacity is increased by 10 to 15 times.
Magneto-optical glass: Faraday rotator glass containing terbium is a key material for manufacturing rotators, isolators and circulators widely used in laser technology. Especially the development of terbium and dysprosium magnetostrictive alloy (TerFenol)