Main applications of lithium tetraborate
Release time:
2021-07-20
Lithium tetraborate It is a white crystal, melting point 930℃, slightly soluble in water, insoluble in ethanol and other organic solvents, usually pentahydrate. Lithium pentaborate is often an octahydrate, a white powder with a relative density of 1.72. It loses all its crystalline water at 300-350℃. Both can be prepared by melting and reacting lithium hydroxide and boric acid together and used as enamel.
Applications
Lithium tetraborate Also known as lithium pyroborate, with the molecular formula Li2B4O7 and molecular weight 169.12. High-purity, high-density lithium tetraborate is a new type of temperature-compensated surface acoustic wave substrate chip and piezoelectric single crystal substrate material, widely used in microelectronics, digital technology, optoelectronic technology, new computers, video communication, military technology, and satellite communication. For example, lithium tetraborate piezoelectric crystals can be prepared, especially the preparation method of large-size lithium tetraborate piezoelectric crystals. This includes pressing the synthesized lithium tetraborate polycrystalline material into a dense cylindrical body, placing the body in a platinum crucible pre-placed in a seed crystal, and then placing it in a furnace. The furnace temperature is controlled at 950~1000℃, and the crucible descent speed is 0.1~0.6mm/h. Large single crystals with a thickness of 30~80mm, a width greater than 120mm, and varying lengths can be grown, exceeding 150mm. Then, through lateral processing, the larger side is used as the axis of the crystal rod, and the smaller side is used as the crystal rod to process the large-size lithium tetraborate piezoelectric crystal in the thickness direction to obtain the configuration file. Compared with the traditional lowering method, it overcomes the technical bottlenecks encountered in the growth of large-size lithium tetraborate crystals by the traditional lowering method, such as seed crystal difficulties, crucible leakage, and crystal cracking. Lateral growth and flat crucible design can increase the crystal growth rate, thereby reducing the difficulty of crystal growth and facilitating the industrial growth of large-size lithium tetraborate crystals.
In addition, Lithium tetraborate It can also be used in the field of analysis, such as the detection of the main content of industrial barium carbonate. The methods include: using analytically pure lithium tetraborate as a solvent, high-temperature melting in a platinum crucible to form a sample required for a fluorometer, as a sample to be measured. Before testing, a series of standard samples are melted with analytically pure lithium tetraborate as a solvent and pure barium carbonate to establish a standard working curve. The barium carbonate content of the sample to be measured is detected and analyzed using the working curve. (1) The standard sample and the sample to be measured are melted with analytically pure lithium tetraborate, and the stable and fast detection characteristics of the fluorometer are used for detection. The entire process of the sample is melting (automatic) and detection (instrument detection), and the time is 25 minutes. In this process, errors caused by chemical titration can be eliminated, and labor is freed and technological content is improved. (2) Using analytically pure lithium tetraborate as a solvent, the molten sample is uniform and stable, and the detection results are reliable; (3) The elements of analytically pure lithium tetraborate are all light elements, with almost no matrix interference, and the reliability of the detection results is higher than that of traditional methods.
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