Lithium metasilicate
Lithium metasilicate is an ionic compound with the formula Li2SiO3
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| IUPAC name
Lithium metasilicate | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.030.232 |
| EC Number |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| Li2SiO3 | |
| Molar mass | 89.566 g/mol |
| Appearance | colorless crystals |
| Density | 2.52 g/cm3 |
| Melting point | 1,201 °C (2,194 °F; 1,474 K) |
| insoluble | |
Refractive index (nD) |
1.584 |
| Structure | |
| orthorhombic | |
| Thermochemistry | |
Heat capacity (C) |
99.1 J/mol K |
Std molar entropy (S⦵298) |
79.8 J/mol K |
Std enthalpy of formation (ΔfH⦵298) |
-1648 kJ/mol |
Gibbs free energy (ΔfG⦵) |
28 kJ/mol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Preparation
Lithium metasilicate is prepared by the reaction of lithium carbonate and silicon dioxide at temperatures between 515 and 565 °C.[1]
Applications
The melting of lithium metasilicate is used for the calibration of thermocouples.[2]
References
- Tang, Tao; Zhang, Zhi; Meng, Jian-Bo; Luo, De-Li (December 2009). "Synthesis and characterization of lithium silicate powders". Fusion Engineering and Design. 84 (12): 2124–2130. doi:10.1016/j.fusengdes.2009.02.017.
- Biggar, Gordon M. (June 1972). "Diopside, lithium metasilicate, and the 1968 temperature scale". Mineralogical Magazine. 38 (298): 768–770. Bibcode:1972MinM...38..768B. doi:10.1180/minmag.1972.038.298.16. S2CID 129422457.
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