Lithium tetraborate, p.a.
Lithium tetraborate
CAS: 12007-60-2
Molecular Formula: B4Li2O7
Lithium tetraborate, p.a. - Names and Identifiers
Lithium tetraborate, p.a. - Physico-chemical Properties
| Molecular Formula | B4Li2O7 |
| Molar Mass | 169.12 |
| Density | ≥0.25 g/mL at 25 °C (lit.) |
| Melting Point | 760-880 °C (lit.) |
| Water Solubility | Soluble in water. |
| Solubility | H2O: slightly soluble(lit.) |
| Appearance | White powder |
| Color | White |
| Exposure Limit | ACGIH: TWA 2 mg/m3; STEL 6 mg/m3 |
| Merck | 14,5524 |
| PH | 9.1 (100g/l, H2O, 20℃)(slurry) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stable. Hygroscopic. |
| MDL | MFCD00011083 |
| Use | For metal smelting, enamel manufacturing and X-ray fluorescence analysis |
Lithium tetraborate, p.a. - Risk and Safety
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R22 - Harmful if swallowed R20/21 - Harmful by inhalation and in contact with skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S24/25 - Avoid contact with skin and eyes. S22 - Do not breathe dust. S24 - Avoid contact with skin. |
| WGK Germany | 3 |
| FLUKA BRAND F CODES | 3 |
| TSCA | Yes |
| HS Code | 28402090 |
Lithium tetraborate, p.a. - Nature
Open Data Verified Data
white powder, soluble in hydrochloric acid, slightly soluble in water, not in organic reagents.
Last Update：2024-01-02 23:10:35
Lithium tetraborate, p.a. - Preparation Method
Open Data Verified Data
lithium borate is prepared by the reaction of boric acid and lithium carbonate. Li2B4O7.5H2 O hydrate was obtained from the solution, and the hydrate lost two points of water at 200 ° C., and anhydrous lithium borate was obtained when it was burned at 800 ° C. Or more.
Last Update：2022-01-01 10:59:08
Lithium tetraborate, p.a. - Introduction
Solubility in water: 28.1G/L water (20 C),51.7G/L water (100 C)
Last Update：2022-10-16 17:12:35
Lithium tetraborate, p.a. - Use
Open Data Verified Data
used in enamel industry glaze, grease composition, fluorescence analysis of cosolvent.
Last Update：2022-01-01 10:59:08
Lithium tetraborate, p.a. - Safety
Open Data Verified Data
inhalation is harmful to human body, can cause Cough, Nausea, Vomit, Diarrhea, mental retardation, muscle spasm, conjunctival congestion, pain and so on. Cover the woven bag with a polyethylene plastic bag, each 50kg.
Last Update：2022-01-01 10:59:09
Lithium tetraborate, p.a. - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| overview | lithium tetraborate white crystal. Melting point 930 ℃. Slightly soluble in water, insoluble in ethanol and other organic solvents. Usually pentahydrate. Lithium pentaborate (Li2B10O16) is often octahydrate, white powder, with a relative density of 1.72, and loses all crystal water at 300-350 ℃. It can be made by the melting reaction of lithium hydroxide and boric acid. Used as enamel. |
| Application | Lithium tetraborate, also known as lithium pyroborate, has a molecular formula of Li2B4O7 and a molecular weight of 169.12. High-purity, high-density lithium tetraborate is a new type of temperature compensated surface wave substrate chip and piezoelectric single crystal substrate material. It is used in microelectronics, digital technology, optoelectronic technology, new computers, video communication, military technology, aerospace, Satellite communications, national defense technology and many other fields have extensive and important applications. For example, a lithium tetraborate piezoelectric crystal can be prepared, especially a preparation method of a large-size lithium tetraborate piezoelectric crystal. It includes pressing the first synthesized lithium tetraborate polycrystalline material into a dense cylindrical material block, loading the material block into a Pt crucible that has been put into the seed crystal in advance and incorporating it into the furnace. The furnace temperature is controlled at 950~1000 ℃, and the crucible decline rate is 0.1~0.6 mm/h. It can grow high-quality large single crystals with a thickness of 30~80mm, a width of more than 120mm and a length of more than 150mm. Then, through lateral processing, the side with large size is used as the axial direction of the crystal rod, the small side is processed as the thickness direction of the crystal rod to obtain a large-size lithium tetraborate piezoelectric crystal profile. Compared with the traditional descent method, the above method overcomes the technical bottlenecks encountered in the traditional descent method when growing large-size lithium tetraborate crystals, such as difficult inoculation, easy leakage crucibles, and easy cracking of crystals. It adopts lateral growth and flat crucibles. The design can increase the crystal growth rate, thereby reducing the difficulty of crystal growth, and is conducive to the industrial growth of large-size lithium tetraborate crystals. |
| Uses | Used in metal smelting, enamel manufacturing and X-ray fluorescence analysis, etc. Used as a buffer and preservative Reagents that decompose oxides and silicates by melting. |
| production method | 1. at the beginning of the 20th century, some people used lithium carbonate to boil in boric acid solution to filter out insoluble residues and evaporate and concentrate the filtrate to obtain a colloidal solution like a water glass solution that is highly supersaturated but cannot precipitate crystals. The formation of supersaturated solutions that are difficult to precipitate crystals is a characteristic of lithium tetraborate. F-Felsinger (Filsinger) used alcohol to act on this solution to obtain a white substance composed of Li2O · 2B2O3 · 5H2O. М-П-Dukelski only confirmed the generation of Li2O · 2B2O3 · xH2O when studying the Li2O-B2O3 H2O system, but failed to determine the moisture contained in it. Г-К Goje repeated F-Felsinger's experiment. He obtained a mixture of several lithium borates, and the solid phase composition was roughly consistent with the liquid phase composition. Finally, crystalline lithium tetraborate was successfully prepared according to the following method: 60g(1mol) of boric acid and 14.8g(0.2mol) of lithium carbonate were dissolved in 300mL of water during heating, and the solution was separated from insoluble residue by pouring method and allowed to stand. After a few weeks, white films will appear along the wall of the cup. It has been proved that they are composed of similar small rod-like crystals. These small crystals can be used as seeds for the following products. However, the addition of seed crystals does not accelerate the crystallization process at all. The percentage composition of the three adducts obtained is shown in the table. Table The percentage composition items of the three adducts 123 Li2B4O7 · 3H2OLi2O13 1913 4012 8413 39B2O362 0162 1661 7562 40H2O24 9824 9425 1124 21 Total 100 18100 5099 70100 00 In this way, the obtained crystalline lithium tetraborate is trihydrate. Lithium tetraborate trihydrate must be heated to above 200°C before dehydration begins, and in a narrow range of 200 to 240°C, it immediately loses nearly all of the three molecules of crystal water to obtain anhydrous lithium tetraborate. 2. The preparation method uses lithium carbonate and boric acid to react under red heat to generate lithium tetraborate: |
Last Update：2024-04-09 19:05:10
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