Evaporation Materials Lanthanum Titanate (La2Ti2O7) Granule, Optical Coating Use Lanthanum Titanate 99.99%

Evaporation Materials Lanthanum Titanate (La2Ti2O7) Granule, Optical Coating Use Lanthanum Titanate 99.99%

Appearance: black granular and cylindrical

Density: 5.9g/cm3

Melting point: 1800 ℃

Transmission range: 400-7000nm

Refractive index (500nm): 2.13 (Tsub ≈ 300 ℃)

Evaporation condition: electron gun

Evaporation temperature: 2100 ℃

Rate (angstros): 1.5-2.0

Extinction coefficient: 1 * 10-4 (500nm)

Steam pressure: APC = 1.7e-2pa

Purity: > 99.99%

Application: antireflection film filter

Specification: granular 1-2mm 1-4mm

Lanthanum titanate belongs to ABO3 perovskite structure material, which is a new type of synthetic functional ceramic powder. It can be used as piezoelectric material, photoelectric material, ferroelectric material and so on. Lanthanum titanate (lanthanum titanate) is a typical layered perovskite (A2B2O7) type rare earth composite metal oxide, which has the advantages of high catalytic activity and high photon quantum efficiency, and can use light energy efficiently. Therefore, lanthanum titanate has a wide range of applications in water splitting, organic matter decomposition and environmental treatment.

The traditional solid-state high-temperature synthesis method of lanthanum titanate was used in the past. This method not only has high energy consumption, but also sintering for a long time, resulting in large particle size and uneven distribution of the product, which affects its performance. How to synthesize the product with high purity, small particle size and uniform distribution by economic and reasonable process route has become the key research topic of scientific researchers.

Lanthanum titanate is a kind of metal oxide with perovskite structure. It has excellent properties in many aspects, such as room temperature conductivity and low preparation cost. These excellent properties of lanthanum titanate thin films determine that lanthanum titanate thin films can be used not only as the bottom electrode of ferroelectric thin films, but also as the buffer layer of ferroelectric thin films with perovskite structure. Among many methods for preparing lanthanum titanate conductive thin films, chemical solution deposition has the advantages of simple preparation process, low reaction temperature and easy reaction.

Lanthanum titanate crystal La2Ti2O7 belongs to monoclinic system with perovskite like structure. The space group at room temperature is p21. Lanthanum titanate crystal has good ferroelectric, photocatalysis and electro-optic properties, which has a very wide application prospect in the field of light and electricity. It has a very high Curie temperature (1500 ℃) and a large coercivity field (45kv / cm). It can be used in high temperature electro-optic equipment and information memory, such as high temperature inverter, ferroelectric random access memory (FRAM), etc.

Lanthanum titanate crystal has high dielectric constant (ε r = 42-62), low dielectric temperature coefficient and dielectric loss (100khz-1mhz). Therefore, as an important microwave dielectric material, lanthanum titanate has become a research hotspot at home and abroad. At the same time, it also has good piezoelectric properties, which can be used to make high temperature sensors and microwave piezoelectric devices.

In addition, lanthanum titanate crystal also has excellent photocatalytic activity, which has a good application prospect in water decomposition reaction, fuel cell and other energy conversion technologies. Especially in China, there are many kinds of rare earth elements, which provide a unique platform for the research of lanthanum titanate crystal.

With the development of optoelectronic devices, such as optoelectronic devices, such as thin films and thin films, lanthanum can be used in optical devices. It has high refractive index and high refractive index. At present, lanthanum titanate crystal as a coating material has been widely used in the manufacturing of high-performance optoelectronic devices, but this field is still blank in China; as for the precision optical manufacturing platform, due to the lack of advanced materials, China is also in the production stage of low-end technology products.

At present, most of the target materials used for the preparation of lanthanum lanthanum crystal coating materials are polycrystalline ceramics, which are mainly prepared by low-temperature hydrothermal synthesis, sol-gel method, high-temperature solid-phase synthesis, precipitation method and organic metal decomposition method. Although the polycrystalline ceramic lanthanum titanate crystal is easy to be prepared, it is easy to introduce impurities and form a large number of pores in the preparation process, and it is difficult to ensure the uniformity of composition and structure. These factors play a decisive role in the preparation of high-quality lanthanum titanate crystal films.

Preparation [2]

Step 1: synthesis of lanthanum titanate sol.

Step 1.1: add 170-190 ml of absolute ethanol, 75-85 ml of acetone and 26-33 ml of p-xylene into a 500 ml three port round bottom flask, and then install an agitator, a temperature measuring thermocouple and a spherical condenser tube. The spherical condenser tube is connected with tap water for cooling, and the 500 ml three port round bottom flask is placed in a constant temperature electric heating bag.

Step 1.2: keep the temperature of solution in 500 ml three port round bottom flask at 60 ℃, and continue to heat and reflux for 30 min, At the same time, the stirring speed of the stirrer was 60 rpm, and then 36-39 ml isopropyl titanate, 3.7-3.9 ml of 25% (mass percent) ethanol solution of tri-tert-butyl isopropylammonium and 3.1-3.3 ml of art-113 were added. The temperature of the solution was maintained at 60 ℃ and refluxed for 30 min. at the same time, the stirring speed of the agitator was 60 rpm to form the first solution.

Step 1.3: place a 200 ml beaker in the magnetic stirring thermostatic water bath pot, add 61-65 ml distilled water into the 200 ml beaker, and keep the water bath temperature at 60 ℃. 6.1-6.3 g of lanthanum nitrate, 2.5-2.6 g of ammonium chloride, 2.5-2.7 g of sodium oxalate and 1.6-1.7 g of dispersant to-125 were added into distilled water respectively, and continuously stirred until all substances were completely dissolved to form a second solution.

Step 1.4: add the second solution into the first solution in a 500 ml three port round bottom flask, then add 0.1-0.3g anhydrous citric acid, install the stirrer, temperature thermocouple and spherical condenser tube, heat and reflow at 60 ℃ for 30 min, at the same time, the stirring speed of the agitator is 60 rpm to form transparent lanthanum titanate sol.