Lithium metasilicate

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Lithium metasilicate
Identifiers
CAS number 12687-80-8
PubChem 66243
ChemSpider 162106396
EC number 233-270-5
Jmol-3D images Image 1
Properties
Molecular 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 ΔG 28 kJ/mol
Except where noted otherwise, 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[edit]

Lithium metasilicate is prepared by the reaction of lithium carbonate and silicon dioxide at temperatures between 515-565°C.

Applications[edit]

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

References[edit]