Lanthanum boride
lanthanum hexaboride
CAS: 12008-21-8
Molecular Formula: B6La
Lanthanum boride - Names and Identifiers
| Name | lanthanum hexaboride |
| Synonyms | lanthanum boide Lanthanum boride LANTHANUM BORIDE Lanthanum hexboride LANTHANUM HEXABORIDE lanthanum hexaboride Lanthanum hexaboride Lanthanum boride (LaB6) (oc-6-11)-lanthanum boride LANTHANUM HEXABORIDE, POWDER, Lanthanum boride (LaB6), (OC-6-11)- LANTHANUM BORIDE - A PRODUCT OF HC STARCK |
| CAS | 12008-21-8 |
| EINECS | 234-531-6 |
| InChI | InChI=1/B6.La/c1-2-5(1)3-4(5)6(1,2)3;/q-2;+2 |
Lanthanum boride - Physico-chemical Properties
| Molecular Formula | B6La |
| Molar Mass | 203.77 |
| Density | 2.61 g/cm3 at 25 °C (lit.) |
| Melting Point | 2210 °C |
| Water Solubility | Insoluble in water, HCl. |
| Appearance | Purple powder |
| Specific Gravity | 2.61 |
| Color | Very dark blue |
| Storage Condition | Room Temprature |
| MDL | MFCD00151350 |
Lanthanum boride - Risk and Safety
| WGK Germany | 3 |
| TSCA | Yes |
Lanthanum boride - Nature
Open Data Verified Data
lanthanum boride is a purple cubic crystalline powder. The lattice constant is a-0. 415 3nm, the relative density is 4.76, the melting point is 2715 ℃, and the microhardness is 2770kg/cm2.
Last Update：2024-01-02 23:10:35
Lanthanum boride - Preparation Method
Open Data Verified Data
lanthanum borate can be prepared by mixing lanthanum chloride, boron trioxide and carbon in a certain proportion, pressure molding, firing at high temperature, cooling and crushing to the required particle size.
Last Update：2022-01-01 10:59:10
Lanthanum boride - Use
Open Data Verified Data
is widely used, has been successfully applied to radar aerospace, electronics industry, instrumentation, medical equipment, home appliance metallurgy, environmental protection and other more than 20 military and high-tech fields. Its series of products mainly include three kinds of powder, polycrystal, single crystal. In particular, lanthanum hexaboride single crystal is the best material for the production of high-power electron tube, magnetron, electron beam, ion beam, accelerator cathode.
Last Update：2022-01-01 10:59:10
Lanthanum boride - Safety
Open Data Verified Data
there are polyethylene plastic bags and wooden boxes for external use, each piece of 0. 5kg. Transport storage and transportation to avoid moisture.
Last Update：2022-01-01 10:59:10
Lanthanum boride - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Overview | Lanthanum hexaboride is a rare earth boride formed by rare earth element lanthanum and non-metallic element boron. Its molecular formula is LaB6, also known as lanthanum boride, with a density of 4.7g/cm3, hard and brittle. In terms of chemical composition, lanthanum boride belongs to inorganic non-metallic materials; in terms of material characteristics, it belongs to oxygen-free metal refractory compounds; in terms of use, it belongs to information materials. At room temperature, lanthanum hexaboride products have three forms: powder, polycrystalline and single crystal, each with its own use. |
| Introduction | The crystal structure of lanthanum hexaboride (lanthanum hexaboride) is CsCl structure, which belongs to a simple cubic crystal system and is a rare earth boride. The molecular formula is LaB6, lanthanum hexaboride is generally purple, and it is black or cyan due to the difference in La:B ratio. LaB6 has many superior properties, such as electron emission intensity, radiation resistance, high temperature chemical stability and other properties, making it widely used in military fields and many high-tech fields, such as radar, aerospace, electronic industry, instrumentation, medical equipment, home appliances, metallurgy and other industries. In the production of high-power electron tubes, magnetrons, electron beams, ion beams, accelerator cathodes and other devices, single crystal lanthanum boride is the preferred material. The crystal structure of LaB6, as shown in Figure 1, is the crystal structure model of LaB6. Like other rare earth element hexaborides, LaB6 belongs to the cubic crystal system CsCl type, which is composed of larger lanthanum atoms A simple cube is formed, and the smaller boron atoms form an octahedron in the crystal lattice. From the perspective of crystallization chemistry, it can be understood that the boron atoms forming the octahedron form a stable three-dimensional skeleton, lanthanum atoms are distributed in the middle gap. fig. 1 is the crystal structure model of LaB6. |
| synthesis method | now the preparation of lanthanum hexaboride is generally prepared by boron carbide thermal reduction method, and its reaction formula is: La2O3 3B4C 2LaB6 3CO; As the reaction introduces boron carbide as the reaction raw material, the carbon content in the product is difficult to control, and due to the high hardness and large particle size of boron carbide, it is easy to produce uneven mixing, deviation of the chemical composition of the product. The second is the element synthesis method, which uses high-purity boron powder and metal lanthanum as raw materials to obtain high-purity products. This method has high synthesis purity and easy control of the process, but the two raw materials are expensive, which makes the cost high. The third is the self-propagating high-temperature synthesis method. The raw materials used are magnesium powder, lanthanum oxide, and boron trioxide. This is the only method that does not need to use high-temperature equipment among all methods. The energy cost is low, but the post-treatment process is more cumbersome, and the product purity is slightly lower, but its particle size has advantages. The fourth is the halide boron thermal reduction method. This method uses lanthanum chloride and boron powder as the reaction raw materials. The product obtained is lanthanum hexaboride and the gas-phase product boron chloride. The product has a single phase and is relatively easy to process. Easy to get higher purity. The successful development of high-purity lanthanum hexaboride can be used in the field of high-purity boride in my country, providing high-quality and stable products, reducing dependence on foreign products. In the production process, the price of boron powder is relatively high, which restricts the development of the process to a certain extent. However, due to its process characteristics, its quality is better than the existing lanthanum hexaboride synthesis process, which still has certain advantages. |
| power generation performance | LaB6 has relatively low work function and is an excellent cathode material, especially suitable for devices with high temperature and high current density. Based on its unique structure, it has good electronic activity. When heated, the metal La atoms diffused from the unit cell can immediately supplement the metal La atoms evaporated from the surface, so that the LaB6 surface always maintains good cathode activity. Due to its high conductivity, good thermal stability and chemical stability, low work function and excellent cathode surface activity, LaB6 has been widely used in cathode emission and has become a good hot cathode material and field emission cathode material. |
| application prospect | due to the quantum size effect, small size effect, surface effect and macro quantum tunneling effect of nanomaterials, many materials have shown outstanding performance after nanocrystallization. similarly, LaB6 nanometer powder has also received increasing attention in research and production, the absorption and scattering of nanometer LaB6 in the near infrared band can be used to block the energy in the near infrared band of sunlight. Therefore, La B6 nano powder can be used to make transparent heat insulation glass with low infrared transmittance. In the research of composite materials, the composite nanoparticles of La B6Si O2/Fe3O4 combine the properties of several different nanoparticles to obtain a composite material with paramagnetic properties and near-infrared light-thermal conversion properties, which can be used to capture Escherichia coli and Staphylococcus aureus; LaB6 nanoparticles prepared under the catalysis of acid The uniformly dispersed SiO2 film has the characteristics of near-infrared absorption, it can be used in the fields of sensors, microelectronics and optical films. |
| references | [1] instrument repair super. research on preparation technology of lanthanum hexaboride nano powder [D]. University of Electronic Science and Technology, 2015. [2] Jiang Yan, Wang Ying. Preparation of Lanthanum Hexaboride Powder by Boron Thermal Reduction [J]. Liaoning Chemical Industry, 2010,39(09):904-905 908. [3] Zhu Bingjin. Preparation and Emission Characteristics of Lanthanum Hexaboride Films [D]. University of Electronic Science and Technology, 2008. |
Last Update：2024-04-09 20:52:54
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Mobile: 18021002903
QQ: 3008007409
Wechat: 18301782025
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