14464-46-1
cristobalite
CAS: 14464-46-1;105269-70-3;1317-48-2
Molecular Formula: O2Si
14464-46-1 - Names and Identifiers
| Name | cristobalite |
| Synonyms | w006 43-63c Sibelite dioxosilane cristobalite metacristobalite Silica crystalline alpha-crystobalite silica,cristobalite silice,cristobalite calcineddiatomaceousearth Calcined diatomaceous earth 1,3-dioxodisiloxane-1,3-diol silica,crystalline-cristobalite |
| CAS | 14464-46-1 105269-70-3 1317-48-2 |
| EINECS | 238-455-4 |
| InChI | InChI=1/H2O5Si2/c1-6(2)5-7(3)4/h1,3H |
| InChIKey | VYPSYNLAJGMNEJ-UHFFFAOYSA-N |
14464-46-1 - Physico-chemical Properties
| Molecular Formula | O2Si |
| Molar Mass | 60.08 |
| Density | 2.6g/mLat 25°C(lit.) |
| Melting Point | 1610°C(lit.) |
| Boling Point | >100°C(lit.) |
| Appearance | tablets (~0.5 g each) |
| Storage Condition | 2-8°C |
| Refractive Index | n20/D 1.544(lit.) |
| Physical and Chemical Properties |
14464-46-1 - Risk and Safety
| Safety Description | 22 - Do not breathe dust. |
| WGK Germany | 3 |
| RTECS | VV7340000 |
| FLUKA BRAND F CODES | 3 |
| HS Code | 28112290 |
| Toxicity | TCLo inhalation in human: 16mppcf/8H/17 |
14464-46-1 - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | cristobalite is a low-density SiO2 homogenous multi-image variant, and its thermodynamic stability zone is 1470 ℃ ~ 1728 ℃ (under normal pressure). β-cristobalite is its high-temperature phase, but it can be stored to a very low temperature in a metastable form until a shift phase transition occurs at about 250°C to form α-cristobalite. Although the quartz can be formed by the crystallization of SiO2 melt in its thermodynamically stable region, most of the quartz in nature is formed under metastable conditions. For example, diatomite is transformed into periclite flint or microcrystalline opal (opal-CT, opal-C, their main mineral phase is α periclite) during diagenesis, and its transition temperature is in the stable zone of quartz; under the condition of granulite phase metamorphism, periclite precipitates from Na-Al-Si-rich melt, exists in garnet in the form of inclusions and coexists with albite, and the temperature and pressure conditions formed are 800 ℃,01GPa, also in the stable zone of quartz. Not only that, many non-metallic mineral materials also have metastable cristobalite formation during the heat treatment process, and the formation temperature is located in the thermodynamic stable zone of tricite. |
| formation mechanism | diatomite is converted into cristobalite at 900 ℃ ~ 1300 ℃; Opal is converted into cristobalite at 1200 ℃; Kaolinite is also produced at 1260 ℃. The artificially synthesized MCM-41 mesoporous SiO2 molecular sieve is converted into cristobalite at 1000 ℃. Other processes such as ceramic sintering and mullite preparation also have metastable cristobalite formation. For the explanation of the metastable formation mechanism of cristobalite, it is agreed that it is a non-equilibrium thermodynamic process, which is mainly controlled by the reaction kinetic mechanism. According to the metastable formation mode of the above-mentioned square quartz, it is almost unanimously believed that the square quartz is transformed from amorphous SiO2. Even in the process of kaolinite heat treatment, mullite preparation and ceramic sintering, the square quartz is also transformed from amorphous SiO2. |
| uses | silica products have been widely used as reinforcing agents in rubber products since their industrial production in the 2040s. in addition, they can also be used in various industries such as pharmaceutical industry, pesticide, ink, paint, paint, toothpaste, paper, food, feed, cosmetics, storage batteries, etc. |
| Production method | The chemical formula of white carbon black is SiO2nH2O, because its use is similar to carbon black and is white, hence the name white carbon black. White carbon black can be divided into precipitated white carbon black (precipitated hydrated silica) and fumed white carbon black (fumed silica) according to different production methods. The production methods of the two products are different, and their properties and uses are also very different. The gas phase method mainly uses silicon tetrachloride and silica obtained by air combustion. The particles are fine and the median particle size can reach less than 5 microns. Precipitation production uses sodium silicate to add sulfuric acid to precipitate silica. The median particle size is about 7-12 microns. Gas phase white carbon black is expensive and not easy to absorb moisture. It is mostly used in coatings as matting agents. The nitric acid water glass solution reacts with nitric acid to form silica, which is rinsed, pickled, deionized water rinsed, and dehydrated to obtain electronic-grade silica. The reaction formula is as follows: |
Last Update：2024-04-10 22:29:15
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