Neodymium oxide is an extremely versatile rare earth oxide. It is mainly used in neodymium iron boron (Nd-Fe-B) permanent magnets, televisions, glass coloring, fluorescent materials, laser materials and additives in the rubber industry. Neodymium oxide has an elegant hue and a good discoloration effect. It is also widely used in ceramics, textile dyeing, superconductivity and other high-tech materials. The application and research of neodymium oxide in the field of catalysis has gradually expanded, such as catalyzing the synthesis of carboxylic acid esters, and the amination of fatty alcohols. Nano neodymium oxide has good catalytic activity.
Neodymium oxide is a kind of lavender solid powder. The body is easily affected by moisture. It absorbs carbon dioxide in the air. It is insoluble in water and soluble in mineral acids. The relative density is 7.24 and the melting point is about 1900℃. Heating in the air can partially generate the high price of neodymium oxide. The crystal structure of neodymium oxide has three types: cubic, triangular and hexagonal. Compared with traditional neodymium oxide materials, due to the nano-sized structure and surface of neodymium oxide nanoparticles, this material exhibits characteristics that conventional materials do not have in terms of magnetism, optics, and electricity.
1. Chemical precipitation method:
The chemical precipitation method is the simplest and most widely used method for preparing nano neodymium oxide particles from liquid phase. It uses various precipitating agents and raw materials containing neodymium ions to form insoluble carbonate and oxalate precursors through precipitation reactions, and then precipitate and filter the generated precursors, and finally calcined to obtain nano-scale neodymium oxide powder. The most commonly used methods are co-precipitation, homogeneous precipitation, complex precipitation and so on. The precipitation method is simple in process, easy to operate, and low in equipment requirements. It is currently a widely used method for preparing nano neodymium oxide powder materials in laboratories and industry. But at the same time, the precursor particles are easy to agglomerate during the preparation process, which leads to the large size of the final neodymium oxide particles, and the post-treatment process is troublesome, and there are disadvantages such as impurity pollution.
2. Pyrolysis method:
The process of preparing nano-neodymium oxide by pyrolysis is relatively simple, the cost is low, the yield is high, and the reaction is easy to control, but the shape of the particles is not well controlled, and it is difficult to obtain particles with similar particle sizes. For example, the thermal decomposition method uses 2-nitrobenzoic acid and neodymium nitrate as raw materials to prepare nano neodymium oxide powder with an average particle size of 15nm.
1. Application in the field of catalysis
Rare earth neodymium oxide ultrafine powder has a wide range of applications in the field of catalysis. For example, nano neodymium oxide is used as a catalyst for the synthesis of important chemical raw materials such as isobutyl acetate and butyl propionate, and carbon nanotubes covered with Nd2O3 nanoparticles are used as an excellent catalyst to reduce the amount of solid rocket propellants. The thermal decomposition temperature of ammonium perchlorate increases its burning rate.
2. Application in the ceramic industry
Ultrafine rare earth neodymium oxide powder can also be used in the ceramic industry. The ceramic pigment coated with a rare earth metal neodymium oxide film is light violet and has a very beautiful pearlescent color. Compared with other pigments, the color is more stable, the color is softer, more pure, the color is more novel, and the finish is better. , And can play a very good UV shielding effect. Nd-doped yttrium oxide ceramics (Nd:Y2O3), as a new type of laser working material, has potential applications in high-power lasers.
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