Lithium metasilicate

Lithium metasilicate is an ionic compound with the formula Li₂SiO₃

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

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]