:Lithium metasilicate
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| Name = Lithium metasilicate
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| IUPACName = Lithium metasilicate
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|Section1={{Chembox Identifiers
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| CASNo = 10102-24-6
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| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = 5QDO50LGBD
| EINECS = 233-270-5
| PubChem = 66243
| ChemSpiderID = 162106396
| SMILES = [Li+].[Li+].[O-][Si](=O)[O-]
| InChI = 1S/2Li.O3Si/c;;1-4(2)3/q2*+1;-2
| InChIKey = PAZHGORSDKKUPI-UHFFFAOYSA-N
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|Section2={{Chembox Properties
| Formula = Li2SiO3
| MolarMass = 89.566 g/mol
| Appearance = colorless crystals
| Density = 2.52 g/cm3
| MeltingPtC = 1201
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| Solubility = insoluble
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| RefractIndex = 1.584
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|Section3={{Chembox Structure
| CrystalStruct = orthorhombic
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|Section4={{Chembox Thermochemistry
| DeltaHf = −1648 kJ/mol
| DeltaHc =
| DeltaGf = 28 kJ/mol
| Entropy = 79.8 J/mol K
| HeatCapacity = 99.1 J/mol K
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|Section7={{Chembox Hazards
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|Section8={{Chembox Related
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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 and 565 °C.{{cite journal |last1=Tang |first1=Tao |last2=Zhang |first2=Zhi |last3=Meng |first3=Jian-Bo |last4=Luo |first4=De-Li |title=Synthesis and characterization of lithium silicate powders |journal=Fusion Engineering and Design |date=December 2009 |volume=84 |issue=12 |pages=2124–2130 |doi=10.1016/j.fusengdes.2009.02.017|bibcode=2009FusED..84.2124T }}
Applications
The melting of lithium metasilicate is used for the calibration of thermocouples.{{cite journal |title=Diopside, lithium metasilicate, and the 1968 temperature scale |journal=Mineralogical Magazine |date=June 1972 |volume=38 |pages=768–770|doi=10.1180/minmag.1972.038.298.16 |bibcode=1972MinM...38..768B |last1=Biggar |first1=Gordon M. |issue=298 |s2cid=129422457 }}