Lithium metasilicate

Lithium metasilicate

Names
IUPAC name Lithium metasilicate
Identifiers
CAS Number	12687-80-8
ChemSpider	162106396
EC Number	233-270-5
Jmol 3D model	Interactive image
PubChem	66243
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
Specific heat capacity (C)	99.1 J/mol K
Std molar entropy (So298)	79.8 J/mol K
Std enthalpy of formation (ΔfHo298)	-1648 kJ/mol
Gibbs free energy (ΔfG˚)	28 kJ/mol
Vapor pressure	{{{value}}}
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 between 515-565°C.

Applications

The melting of lithium metasilicate is used for the calibration of thermocouples.