- Rare and refractory metals
Lanthanides — a whole chemical family, which consists of fourteen elements, refers to the third group of the sixth period of the periodic table of DI Mendeleyev. They are used as alloying additives to steels (they improve the mechanical resistance, heat resistance, corrosion resistance), as well as for the production of glass that blocks ionizing radiation. For the production of varnishes and paints, lanthanide compounds are used.
Lanthanum is a light-gray metal, very easily deformable. The mechanical properties depend on the amount of impurities. The entire group of lanthanides has pronounced magnetic properties, which contributes to the creation of various magnetic materials based on them. Their cost is quite affordable.
|Physical properties of La|
|Atomic (molar) mass g / mol||138.9|
|Degree of oxidation||3|
|Density [g / cm 3 ]||6.17|
|Melting point t ° C||920 ° С|
|Heat of fusion kJ / mol||8.5|
|Thermal conductivity K [W / (m · K)]||13.4|
|Heat of evaporation kJ / mol||402|
The abundance of lanthanides is subject to a general pattern: elements with an even number are encountered more often than with odd ones. Only about two hundred minerals are known, of which about 70 are rare-earth minerals containing impurities of these elements. This shows that such elements are not so rare, and the «rare» — the common old name of lanthanides — is only a tribute to the past. For example, cerium is greater on earth than lead, and the rarest rare earth metals are much more abundant than mercury. The problem lies in their absent-mindedness and technical sophistication.
Buy at a bargain price
A wide selection of rare metals in the warehouse «Avek Global» LLC is able to satisfy any consumer. Quality is ensured by absolute observance of all technological production standards. We offer products from warehouses of Russia, Ukraine with delivery to any address. Our specialists will pack, staff, mark your purchase, and also will follow the delivery. All cash products are certified. The price depends on the volume of the order and the additional terms of delivery. The timing of orders is minimal. With bulk orders, the company provides substantial discounts.