(镧(La)) Origin and use of rare earth element names

镧(La)

The element "镧" was named in 1839, when a Swede named "Moussand" discovered that other elements were contained in the earth. He borrowed the word "hidden" in Greek to name the element " lanthanum".

The application of germanium is very extensive, such as piezoelectric materials, electrothermal materials, thermoelectric materials, magnetoresistive materials, luminescent materials (blue powder), hydrogen storage materials, optical glass, laser materials, various alloy materials, and the like. It is also used in the preparation of many organic chemical products. The light-transfer agricultural film is also used in the field. In foreign countries, scientists have given the role of cockroaches to crops as the name of “super calcium”.

Name: yttrium oxide; lanthanum oxide data: La2O3 molecular weight 325.84 white amorphous powder. The density is 6.51 g/cm3. The temperature of 2217 ° C. The boiling point of 4200 ° C. Slightly soluble in water, soluble in acid to form the corresponding salts. It is easy to absorb carbon dioxide and water in the exposed air and gradually becomes barium carbonate. The burning of cerium oxide combines with water to release a large amount of heat. The application field is mainly used to manufacture special alloy precision optical glass and high refractive optical fiber board, which is suitable for camera, camera, microscope lens and advanced optical instrument prism. It is also used in the manufacture of ceramic capacitors, piezoelectric ceramic admixtures, and X-ray luminescent materials such as bismuth oxychloride. Extracted from phosphonium ore or obtained by burning barium carbonate or barium nitrate. It can also be obtained by heating decomposition of hydrazine oxalate. It is used as a catalyst for various reactions, such as oxidizing cadmium oxide to catalyze the oxidation reaction of carbon monoxide, and palladium doping to catalyze the hydrogenation of carbon monoxide to methane. Cerium oxide impregnated with lithium oxide or zirconium oxide (1%) can be used to make ferrite magnets. It is a very effective selective catalyst for the oxidative coupling of methane to ethylene and ethylene. It is used to improve the temperature dependence and dielectric properties of barium titanate (BaTiO3) and barium titanate (SrTiO3) ferroelectrics, as well as to manufacture fiber optics and optical glass. Physical and chemical properties of cerium oxide Appearance and properties: White solid powder. Relative density: 6.51 g/mL at 25 °C (li melting point: 2315 °C boiling point: 4200 °C Solubility: soluble in acid, ethanol, ammonium chloride, insoluble in water, ketone. The use of cerium oxide is mainly used in manufacturing Precision optical glass, optical fiber. Also used in the electronics industry as ceramic capacitors, piezoelectric ceramics doping agent. Also used as raw material for the production of lanthanum boride, petroleum separation and purification catalyst. Operation and storage operation of yttrium oxide Note: Closed operation The operator must be specially trained to strictly abide by the operating procedures. It is recommended that the operator wear a filter-type gas mask (half mask), wear safety glasses, wear anti-static overalls, wear rubber and oil resistant gloves. Keep away from fire, heat, work. Smoking is strictly prohibited in the premises. Explosion-proof ventilation systems and equipment are used to prevent vapor from leaking into the workplace air. Avoid contact with oxidants, acids, and alkalis. The flow rate should be controlled during filling, and there should be grounding devices to prevent static electricity from accumulating. It should be lightly loaded and unloaded to prevent damage to packaging and containers. Equipped with the corresponding variety and quantity of fire-fighting equipment and leakage emergency treatment equipment. Storage may be harmful. Storage precautions: Usually, the product is added with a polymerization inhibitor. Store in a cool, ventilated warehouse. Keep away from fire and heat. The temperature should not exceed 30 ° C. The packaging requirements are sealed and should not be in contact with air. Acids, alkalis, etc. should be stored separately and should not be mixed. Explosion-proof lighting and ventilation facilities should be used. It is forbidden to use mechanical equipment and tools that are prone to sparks. The storage area should be equipped with leakage emergency treatment equipment and suitable containment materials. Transport Dangerous Goods Code: No information UN number: No data Packing method: Small open steel drum; ordinary wooden box outside the ampoule; threaded glass bottle, iron cap glass bottle, plastic bottle or metal barrel (can) Ordinary wooden box.

Transportation precautions: Transportation vehicles should be equipped with the appropriate variety and quantity of fire-fighting equipment and leakage emergency treatment equipment. It is best to transport in the summer and evening. The tank (tank) used in transportation should have a grounding chain, and a hole partition can be arranged in the tank to reduce the static electricity generated by the shock. It is strictly forbidden to mix and transport with oxidants, acids, alkalis, food chemicals, etc. During transportation, it should be protected from exposure, rain and high temperature. Keep away from fire, heat and high temperature areas during stopovers. The vehicle exhaust pipe carrying the item must be equipped with a fire-blocking device, and it is forbidden to use mechanical equipment and tools that are prone to sparks. When transporting by road, follow the prescribed route and do not stay in residential areas and densely populated areas. It is forbidden to slip when transporting by rail. It is strictly forbidden to transport in bulk by wooden or cement vessels.

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Label: Rare earth elements

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