Lithium metasilicate

Lithium metasilicate
Names
	IUPAC name Lithium metasilicate
Identifiers
CAS Number	10102-24-6 Y;
3D model (JSmol)	Interactive image;
ChemSpider	162106396;
ECHA InfoCard	100.030.232
EC Number	233-270-5;
PubChem CID	66243;
UNII	5QDO50LGBD Y;
CompTox Dashboard (EPA)	DTXSID30904264 ;
	InChI InChI=1S/2Li.O3Si/c;;1-4(2)3/q2*+1;-2 Key: PAZHGORSDKKUPI-UHFFFAOYSA-N;
	SMILES [Li+].[Li+].[O-][Si](=O)[O-];
Properties
Chemical formula	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)
Solubility in water	insoluble
Refractive index (nD)	1.584
Structure
Crystal 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

Lithium metasilicate is an ionic compound with the formula Li₂SiO₃

Preparation

Lithium metasilicate is prepared by the reaction of lithium carbonate and silicon dioxide at temperatures around 800-900°C.¹

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. Bibcode:2009FusED..84.2124T. 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.